Bis-(substituted phenoxy)-alkanes,their preparation and pharmaceutical compositions containing them

This invention relates to compounds which have hypolipidaemic activity, to a method for their preparation and to pharmaceutical compositions containing them.

Our British Patent Specification No. 1,482,195 discloses, a class of compounds of formula (I) as having hypolipidaemic activity:

<img file="IL52622A_D0001.tif" />

wherein R^ is .a carboxylic acid group or a salt, ester or hydrazide of a carboxylic acid group; an alkyl group., optionally substituted with one Or more hydroxyl groups;

cyano a nitrile, formyl, $ alkanoyl or carboxyl-substituted £ alkanoyl group; R^ is a hydrogen atom, a lower alkyl group or a lower alkoxyl group;

R^ is a hydrogen or halogen atom, or a lower alkyl or lower, alkoxyl group;

R. is a hydrogen or halogen- atom, or a phenyl; lower alkyl, lower alkoxyl, halo-lower alkyl, or nitro group; or

R and R״ together form the residue of a fused benzene ring;

Z is oxygen or sulphur;

X is a straight or branched lower-alkylene, lower-alkylene-oxy, lower-alkylene-thio, or lower-alkylene-carbonyl group;

q is zero or an integer from 1-12: and one of m and. n is zero and the other is one.

One sub-group of compounds within said British Patent Specification has the structure (II) :

<img file="IL52622A_D0002.tif" />

wherein R^, R^, R_o, R^ and q are as defined above with respect to formula (I), x is an integer from 1 to 6 and Y is oxygen or sulphur.

Within the class of compounds of formula (1) and of formula (II) the hypolipidaemic activity of course varies from individual compound to compound, and in particular there is no correlation between the value of the integer x and the hypolipidaemic activity of the compound. We have now found that if the integer x is increased beyond six, the hypolipidaemic activity of the compounds is unexpectedly improved.

Accordingly the present invention provides, a compound of formula (III):

(III) (CH₂)q

<img file="IL52622A_D0003.tif" />

wherein R is a carboxylic acid group or a salt thereof, a lower alkoxycarbonyl group or a alkylcarbonyl group;

q is zero, 1 or 2;

y is an integer from 7 to 25; and

R⁵ is halogen, C^-Cg alkyl, or Cj-Cg alkoxyj provided that when R is a carboxylic acid group or a salt thereof or a lower alkoxycarbonyl group, q is zero and y is an integer of 7 to 10, then r5 is other than halogen in the para-position.

When the group R is a salt of a carboxylic acid group, suitable salting ions include metal ions e. g. . aluminium alkali ־ metal ions such as sodium or potassium, alkaline earth metal ions such as calcium or magnesium, and ammonium or substituted ammonium ions for example those from lower a2.kyl amine s, such as triethyl amine, hydroxylower alkylamines such as 2-hydroxyethylamine, bis(2-hydroxyethyl)-amine or tri-(2-hydroxyethyl)-amine, cycloalkylamines such as bicyclohexylamine, or from procaine, dibenzylamine, N, N—dibenzylethylenedi amine, 1— ephenamine, N—ethylamine, N, N¹—bis-dehydroabietylethylenediamine, or bases of the pyridine type such as pyridine, collidine or quinoline.

Suitable' esters wherein R is an alkoxycarbonyl group include methyl, ethyl,n-and iso-propyl, η-,sec, iso and tert butyl, and pentyl esters.

Preferred ester groups are methyl and ethyl.

In one preferred class of compounds, the moiety ch₂)

R is a group which is converted in the body to a carboxymethyl group of formula - CH₂CO₂H. For example when g is

1, R may be carboxyl, or a salt or lower alkyl ester thereof.

Suitable C^-Cg alkyl groups for R include methyl, ethyl and straight and branched chain propyl and butyl groups.

Suitable C^_g alkoxy groups for R include methoxy and ethoxy groups .

Preferably R^ is C-^_g alkyl or halogen; especially chlorine.

The integer y may be from 7 to 25 but is preferably in the range 9 to 16, especially 10 to 14.

One sub-class of compounds within the present invention is represented by formula (IV).

<img file="IL52622A_D0004.tif" />

<img file="IL52622A_D0005.tif" />

wherein R, R⁵ and y are as 'defined with respect to formula (III).

Preferably R is in the 4-position.

Specific compounds of formula (IV) include:

1- (4-ethoxycarbonylphenoxy)-7-(4-chlorophenoxy)-n-heptane;

1- (4-ethoxycarbonylphenoxy )-8-( 4-chlorophenoxy )-n-octane;

_ (4-ethoxycarbonylphenoxy )-9-( 4-chlorophenoxy) -n-nonane;

1- (4-ethoxycarbonylphenoxy) -10- (4-chlorophenoxy )-n-decane;

1- (4-ethoxycarbonylphenoxy) -11-( 4-chlorophenoxy) - n-undecane;

1- (4-ethoxycarbonylphenoxy) -12-( 4-chlorophenoxy )-n-dodecane;

1-(4-ethoxycarbonylphenoxy )-13-(4-chlorophenoxy) -n-tridecane;

1- (4-ethoxycarbonylphenoxy) -14- (4-chlorophenoxy) -n-tetradecane;

1- (4-ethoxycarbonylphenoxy )-15-( 4-chlorophenoxy) -n-pentadecane;

l-(4-ethoxycarbonylphenoxy)-20-(4-chorophenoxy)-n-eicosane;

1- (4-ethoxycarbonylphenoxy) -10- (4-f luorophenoxy )-n-decane;

1- (4-ethoxycarbonylphenoxy) -10- (4-methoxyphenoxy) -n-decane;

1- (4-acetylphenoxy )-12-( 4-chlorophenoxy )-n-dodecane.

A further group of compounds having good hypolipidaemic activity is represented by formula (V):

<img file="IL52622A_D0006.tif" />

wherein R, R and y are as defined with respect to formula (III), and q is 1 or 2.

Examples of compounds of formula (V) wherein q is 1 are;

γ ' 1-( 4~ethoxycarbQnylmethylphenoxy)-7-(4-ohlorophenoxy) heptane: and .

1—(4-ethoxycarbonylmethylphenoxy)-10-(4-chloroplienoxy)-decane.

Examples of compounds of formula (v) wherein q is 2 are:

1-£4-^-ethoxycarbonylethy^phenoxyJ-10-( 4-chlorophenoxy) decane; and

1- [4-^8 -ethoxycarbonylethy^phehcxyj -12- (4-chlorophenoxy) ־

-dodecane. .

A further sub-class of compounds of this invention is represented by formula (VI) :

<img file="IL52622A_D0007.tif" />

<img file="IL52622A_D0008.tif" />

wherein R and y are as defined with respect to formula (III) above.

An example of a compound of formula (VI) is:

1-(4-(β-acetylethyl)phenoxy]-10-[4¹-chlorophenoxy]-decane.

The compounds of this invention may be prepared by reacting a compound of formula (VII):

R

I ⁽,^CH2’q

A״ <^VII>

'[0 - (CH₂)_y] _n- P _ with a compound of formula (VIII):

Q - [(CH ) - 0 j ^L 2 y m

<img file="IL52622A_D0009.tif" />

(VIII) wherein R, R , q and y ' are as defined.with respect to formula(III):

one of n and m is one and the other is zero:

P represents - OH or a reactive derivative thereof when n is zero or is a readily displaceable group when n is 1; and Q represents - OH or a reactive derivative thereof when m is zero or is a readily displaceable group when m is 1; and optionally thereafter converting at least one group R and to a different such group.

Reactive derivatives of the group -OH include salts thereof and other derivatives which increase the nucleophilicity of the oxygen atom.

By a readily dispalceable group is meant an atom.or group which is displaceable by a nuclephilic centre (such as the lone pair electrons on a hydroxyl oxygen or alkoxide ion). Such groups include halides such as iodine, bromine or chlorine: pseudo-halides such as the azido group N active esters such as the groups -O.SC^CH^

O.CO.OC-H-7 compounds prepared in situ from dehydrating z כ agents such as carbodiimides or carbonyldiimidazoles, phosphorus pentachloride., phosphoryl chloride, thionyl chloride, or ';phosphorus pentoxide: or other such good leaving groups.

If the hydroxyl compound used in the above condensation reaction is in the form of a salt, it is generally in the form of the sodium or potassium salt.

When the condensation reaction uses a salt as one of the reactants, the salt is preferably produced by means of a strong base, for example, sodium hydride, sorinm-Me, or a sodium alkoxide or sodium methoxide.

Suitable solvents for the reaction include dimethylformamide or dimethyl sulphoxide (especially when employing sodium hydride or sodamide as base), methanol (when using sodium methoxide) and ethanol (when using sodium ethoxide).

>

It may be pref£rable to modify the substituents R and/or R’’ after the condensation reaction rather than before. Thus, it is preferable, when preparing compounds of formula (III) wherein R is a carboxylic acid group, first to prepare the corresponding compound with a carboxylic acid ester group and then to convert such group to a carboxylic acid group by conventional means.

Alternative methods of preparing compounds wherein R contains an alkoxycarbonyl group include the esterification of the free acid or its salt or other reactive derivative of the acid, or transesterification of a compound having a different ester group. Esterification may be performed by any conventional method, for example by reaction of the free acid: (.a) with the appropriate alcohol in the presence of a catalyst such as a strong acid, dry hydrogen chloride, or p-toluenesulphonic acid: or (b) with the appropriate halide or sulphate of the alcohol in the presence of dimethyl sulphoxide and calcium carbonate or with the halide in the presence of hexamethylphosphoramide or (c) by phase transfer catalysis methods with the halide and/or sulphate of the alcohol in aqueous and/or organic solution in the presence of a quaternary ammonium salt such as tetrabutyl ammonium bisulphate or halide, or benzyltrimethy!ammonium halide.

The formation of compounds (III) wherein R is an alkoxycarbonyl group may also be carried out by conventional transesterification methods, for example reaction of an ester with the appropriate second alcohol in the presence of a catalyst such as the sodium salt of the alcohol, or dry hydrogen chloride, p-toluenesulphonic acid, or potassium cyanide.

Compounds of formula (III) wherein R is an alkoxycarbonyl group may also be prepared by alkanolysis of the corresponding nitrile (R-CN); or by hydrolysis of an iminoether compound having formula (III) wherein R is a group of formula:

R 0 —---־C ------a

NH wherein R is the hydrocarbon residue of an alcohol or phenol.

Compounds wherein R is a carboxyl group may be prepared by oxidation of the corresponding precursor having formula (III) wherein R is selected from:

a) formyl:

b) methyl;

c) hydroxymethyl;

d) vinyl, or substituted vinyl;

e) acyl

Examples of the reagents which may be employed to effect such oxidations include respectively,

a) basic silver oxide, or concentrated nitric acid:

b) acidic sodium or potassium dichromate:

c) manganese dioxide followed by basic silver oxide:

d) aqueous potassium permanganate in an organic solvent such as benzene in the presence of a quaternary ammonium salt such as a tetrabutylammonium halide:

e) a hypohalite. The acyl group may be an acetyl group (CH^CO). Preferable the hypohalite reactant is sodium hypohalite which may be generated in situ in aqueous solution by the reaction of sodiumhydroxide on a mixture of iodine and potassium iodide. The desired free acid may be isolated and converted to any desired salt by known methods.

is

Compounds wherein R contains a carboxylic acid group can also be prepared by the acid or base catalysed hydrolysis of the corresponding compound of formula (III) wherein R is selected from:

a) carboxylic acid amide group:

b) nitrile group (-CN):

c) esterified carboxylic acid group

Hydrolysis of amides may be carried out using a mineral acid as catalyst, suitably hydrochloric acid or ailphuric acid. Base catalysed hydrolysis may be —1-5— carried out using an alkali metal or alkaline earth metal hydroxide, e.g. sodium or potassium hydroxideSuitably the hydrolysis reaction is carried out in aqueous solution and fairly severe reaction conditions

5j are preferred, e.g. refluxing for several hours. The desired compound can be isolated as the free acid by neutralisation of the resultant reaction mixture or as the appropriate base addition salt (e.g. sodium salt . ־&lt; if sodium hydroxide was employed) or acid addition salt (e.g. the hydrochloride if HC1. was employed.).

י Alternatively the free acid can be converted to any desired salt by standard procedures.

For the hydrolysis of a compound wherein R is a cyano nitrile group, ammonia is liberated and thus the preferred

15:ךי catalyst is an acid which will bind the ammonia e.g.

a hydrogen halide such as HC1 or HBr. If base catalysed hydrolysis is used, ammonia is liberated and the acid will be obtaned as an alkali salt, or, after neutralisation, as the free acid.

For the hydrolysis of an esterified carboxylic acid group, preferably the process involves hydrolysis with a strong base such as sodium hydroxide. The esterified carboxylic acid groups R may be, for example lower alkoxycarbonyl groups such as methoxycarbonyl or tertiary butoxycarbonyl groups. The remarks made earlier about salts of the resultant free acid also apply in this case.

A further method for the preparation of compounds of formula (III) wherein R is a carboxylic acid group comprises the carbonation of a compound of formula(II) —— wherein R is a group of formula:

- MX followed by hydrolysis, wherein M is magnesium, calcium or lithium and X is chlorine, bromine or iodine. Such reagents are of course well known in the art and may be prepared by known methods. Carbonation is preferably carried out using gaseous carbon dioxide but solid carbon dioxide may be used on occasion. . Hydrolysis of the intermediate formed after carbonation can be carried out simply by the addition of water.

An alternative method for the preparation of the compounds of this invention comprises the selective reduction of a compound of formula (IX) :

R

<img file="IL52622A_D0010.tif" />

wherein R, q and R are as defined with respect to fgrmula B (III) above, X represents either a carbonyl group, -Cor an alkynyl group, - CSC -, and t and u are integers such that the total numer of carbon atoms in the group /(CH2)^.-X(CH2)_U_/ i^s from 7 to 25,

Any suitable method of reduction may be used depending on the nature of X and which does not reduce other moieties in the molecule. A suitable method when X is carbonyl, .is the action of an alkali metal borohydride reagent, such as sodium cyanoborohydride on a corresponding hydrazone of compound(IX).

When X is alkynyl, a convenient method of reduction of compound (IX)is catalytic hydrogenation, for example in the presence of platinum oxide.

The hypolipidaemic compounds according, to the invention may be formulated for administration in any convenient way using techniques kn&amp;wn in the art. The invention therefore also provides present/ a pharmaceutical composition comprising a compound of formula (III) above together with a pharmaceutical carrier or excipient.

The compositions may be formulated for administration by any route, although an oral administration is preferred. The compositions may be in the form of tablets, capsules., powders, granules, lozenges, or liquid preparations,. such 20 as oral or sterile parenteral solutions or suspensions,

Tablets and capsules for oral administration may be in unit dose presentation form, and may contain conventional excipients such as binding agents, for example syrup, 'acacia, gelatin, sorbitol, tragacanth, or polyvinyl25 pyrollidone; fillers, for example lactose, sugar, maize-starch, calcium phosphate, sorbitol, or glycine:

<img file="IL52622A_D0011.tif" />

tabletting lubricants, for example magnesium stearate, talc, polyethylene glycol נס/ silica: disintegrants, for example potato starch: or acceptable wetting agents such as sodium lauryl sulphate. The tablets may be coated according to methods well known in normal pharmaceutical practice. Oral liquid preparations may be in the form of, for example, aqueous or oily suspensions, solutions, emulsions, syrups, or elixirs, or may be presented as. dry product for reconstitution with water or other suitable vehicle before use. Such liquid preparations may contain conventional additives such as suspending agents,, for example sorbitol, syrup, methyl cellulose, glucose syrup, gelatin, hydroxyethylcellulose, carbcdtymethylcellulose, aluminium steak ate/qelbor ׳?hydrogerrated' edible fats, emulsifying agents,. for example lecithin, sorbitan monooleate, or acacia: non-aqueous vehicles (which may include edible oils), for example almond oil, fractionated coconut oil, oily esters such as glycerine, px>.pylene glycol, or ethyl alcohol: preservatives, for example methyl or propyl p-hydroxybenzoate or sorbic acid, and if desired convention flavouring or colouring agents.

Suppositories will contain conventional suppository bases, e.g. cocoa, butter or other glyceride.

For parenteral administration, fluid unit dosage forms are prepared utilizing the compound and a sterile vehicle, water being preferred. The compound, depending on the vehicle and concentration used, can be either suspended or dissolved in the vehicle.

־ 16 The compound may be administered alone^ in combination with one or more pharmaceutically acceptable carriers, or as part of the total dietary intake. In the latter case, the amount of said compound may be less than 1%. by weight of the diet and is preferably no more than 0.5% by weight. The diet for a man may consist of normal food—stuffs to which the ester has been added,, and similarly the diet for animals may consist of food stuffs and the compound may be added alone or with a premix.

In order to achieve an effective degree of serumlipid lowering, the compound should preferably be administered to the animal or patient in an amount of from 1 to 10 g. per day: generally it will be most convenient to spread the daily dosage by giving several smaller more palatable doses.

The following examples illustrate the preparation of some of the compounds of this invention.

־׳17 2Π

Example n-l-(4-Ethoxyca.rbonylphenoxy)-7- (4-chlorophffloxy)-heptane

Sodium (2.5g., 0.11 M) was dissolved in absolute ethanol (50 ml) and ethyl 4-hydroxybenzoate (16.6g., 0.10 M) in ethanol (50 ml) was added at room temperature. The mixture was stirred at room temperature/ for 15 min, l-bromo-7-(4-chlorophenoxy)-heptane (0.10M) in ethanol (50 ml) was added in one portion and the mixture was boiled under reflux with stirring for 24 hours.

The hot solution was filtered to remove sodium bromide, the ethanol removed under vacuum, the product dissolved in 10 di chloromethane (100 ml) and washed with 5% sodium hydroxide solution (2. x 100 ml) and water (2 x 100 ml).

The dichloromethane solution was dried (MgSO^), filtered, evaporated and the product purified by crystallisation, from ethanol m.p. 70-71°.

Examples 2 - 13.

The following compounds were prepared by a method substantially as described in Example 1:

<img file="IL52622A_D0012.tif" />

52622/2

<td> Example No.</td><td> R</td><td> a</td><td> y</td><td> P?</td><td>_{ο־ξ)</td><td> Purification method¹*</td>

<td> 2</td><td>^CO2^C2^H5</td><td> 0</td><td> 8</td><td> Cl</td><td> 61-62</td><td> a</td>

<td> 3</td><td>^CO2^C2^H5</td><td> 0</td><td> 9</td><td> Cl</td><td> 65-66</td><td> a</td>

<td> 4</td><td>^C°2^C2^K5</td><td> 0</td><td> 10</td><td> Cl</td><td> 68</td><td> a</td>

<td> 5</td><td>^C°2^C2^H5</td><td> 0</td><td> 12</td><td> Cl</td><td> 67-9</td><td> b</td>

<td> 6</td><td>^CO2^C2^H5</td><td> 0</td><td> 10</td><td> F</td><td> 59-61</td><td> b</td>

<td> ר</td><td> CO C H 2 2 5</td><td> 1</td><td> 7</td><td> Cl</td><td> 46</td><td> b</td>

<td> 8</td><td> CO-C-H- 2 2b</td><td> 1</td><td> 10</td><td> Cl</td><td> 54</td><td> a</td>

<td> 9</td><td>^CO2^C2^H5</td><td> 2</td><td> 10</td><td> Cl</td><td> 55</td><td> b</td>

<td> 10</td><td> CO₂^C2^H5</td><td> 2</td><td> 12</td><td> Cl</td><td> 61־60</td><td> a</td>

<td> 11</td><td> COCH₃</td><td> 2</td><td> 10</td><td> Cl</td><td> 75</td><td> a</td>

<td>¹²</td><td> CO״C_oH_c 2 2b</td><td> 0</td><td> 10</td><td> OCH,</td><td> 89 -91</td><td> b</td>

<td> 13</td><td> coch₃</td><td> 0</td><td> 12</td><td> Cl</td><td> 81-83</td><td></td>

purification by crystallisation by ethanol purification by chromatography on silica gel using dichloromethane as eluent.

Example Z^?

1-(4-Ethoxycarbonylphenoxy)-13-(4-chlorophenoxy)-tridecane

A mixture of l-(4-chlorojhenoxy)-13-tridecanol (3.27 g.; 0.01 M.), ethyl. 4-hydroxybenzoate (2.49g.: 0.015 M) and. dicyclohexylcarbondiimide(3.09 g.: 0.015M.) was heated at 100-105°C for 5 hours with.stirring.

The reaction mixture was cooled to room temperature?. dichloromethane was added and the mixture was filtered.

Th® filtrate evaporated to dryness under reduced pressure and the crude product (5.95 g.) was chromatographed on silica-gel(250g.) in dichloromethane to give 1-(4-ethoxycarbonylphenoxyj-l3-(4-chlorophenoxy) -tridecane (1.82g.738%). M.P. 75-7°c.

Example

1-(4-Ethoxycarbonylphenoxy)-11-(4-chlorophenoxy)-undecane was prepared by a method substantially as described in Example 14, m.p. 94-95°c.

Example l-(4-Ethoxycarbonylphenoxy) -15- (4-chlorophenoxy) -pent adecane

a) Sodium (0.69g: 0.03 M.) was dissolved in absolute ethanol . (30 ml.) with protection from atmospheric moisture. .

Ethyl 4-hydroxybenzoate (4.98g; 0.03 M.) in absolute ethanol (20 ml.) was added and the mixture was stirred at room temperature for 30 minutes. A solution of 1bromo-15-(4-chlorophenoxy)-pentadecan-ll-one (8.62 g. 0.02 M.) in absolute ethanol (30 ml.) was added and the mixture was boiled under reflux with .

r, 23 .stirring for 8 hours. After cooling to room temperature dichloromethane (200 ml.) was added, the mixture was extracted with 5% sodium hydroxide solution ( 2 x 100 ml.) and./water (1 x 100 ml.).

The solution was dried (MgSC^), the solvent evaporated under reduced pressure and the crude product (8.75 g.) was purified by chromatography on silica-gel (300 g.) in dichloromethane to give l-(ethoxycarbonylphenoxy)15-(4-chlorophenoxy)- pentadecan-ll-one(5.07g.: 33%),

M.P. 95-96°C.

b) To l-(4-ethoxycarbonyl)-15-(4-chlorophenoxy)-pentadecan -11-one (2.07 g.; 0.004 M) in 1:1 D.M.F. - sulpholane was added tosylhydrazine (0.93g.: 0.005 M) and ptoluenesulphonic acid (0.12g.). The mixture was heated .15 at 105°c for 1 hour with stirring, cyclohexane (8mL.) was added at this temperature and.sodium cyanoborohydride (1.01g.;0.016M)was added portionwise over a period of . . o ' 5 minutes. The mixture was stirred at 105 c for 2 hours, cooled to room temperature and added to iced ^water (70 ml). Extraction with cyclohexane.( 2 x 100 ml.) ׳^,followed by drying (MgSO₄) and evaporation of the solvent under reduced pressure yielded a gummy material (1.40g.) which on cl^romatography On silica25 gel (50g.) in dichloromethane gave l-(4-ethoxycarbonylphenoxy)-15-(4-chlorophenoxy) pentadecane (1.20g:60%)

M.P. 84-85°C.

Example

1-(4-Ethoxycarbonyiphenoxv)-14-(4-chlorophenoxy)-tetradecane

To a solution of. sodium (0.58g.: 0.025 M.) in absolute ethanol (15 ml.) was added ethyl 4-hydroxybenzoate (4.15g .. ,0.025 M.) in absolute ethanol (20 ml.) and the-mixture was stirred at room temperature for 15 minutes. A . solution of l-bromo-14-(4-chlorophenoxy)-tetradec-9-yne (7.00g.: 0.0175 MJ in absolute ethanol (20 ml). was added and the mixture was boiled under reflux with, stirring for 6 hours. The reaction mixture was cooled to room temperature^ filtered and the solvent removed under reduced pressure. Dichloromethane (100 ml.) was added to the residual, oil. the solution was washed with 5% sodium hydroxide solution (.2 x 100 ml.). saturated־ sodium chloride solution (1 x 100 ml.), deled and evaporated. The oil thus produced was;/purified by chromatography on silica-gel (250 g.) in dichloromethane to give 1-(4ethoxycarbonylphenoxy)-14-(4-chlorophenoxy)-tetradec-9-yne. (3.76g.,: 44%) M.P. 52-53 °C.

1λ(4—ethoxycarbonylphenoxy)—14—(4—chlorophenoxy)—tetradec 9-yne (2.00g.: 0.0041 M.) in acetic acid (15 ml.) was reduced in the presence of hydrogen and PtO₂(0.O5g.) at 60°C and atmospheric pressure. When hydrogen absorption was complete the solution was filtered, the catalyst . washed well with ethanol and the solvents evaporated under reduced pressure to yield a colourless oil.

1-(4-ethoxycarbonylphenoxy)-14-(4-chlorophenoxy)-tetradecane (1.62g.: 80%) M.P. 72.5 - 73.5°c was obtained as a pure

' . —26- .- ' 'י' crystalline compound by chromatography of this oil on silica-cel (100 g.) with dichloromsthane as eluent.

Examole 18. - — --- r

1- (4-Ethoxycarbonylphenoxy) -20- (4-chlorophenoxy) -eicosane was prepared by a method substantially as described in Example 17, m.p. 78-8O°C.

EXAMPLE 19:

EXAMPLE 0? ACID PREPARATION: 1-(4-Carborvphenoxy)-10--(4-methoxyphenoxy)decane

To a solution of 1-(4-carboethoxyphenoxy)-10-(4~methoxyphenoxy)-decane (4.03g., 0.01m) in ethanol (jOml) was added a solution of sodium hydroxide (2.0g., 0.05^) in water (50ml). The mixture was boiled under reflux with stirring for 5 hours during which time the ester dissolve□ and a white solid precipitated. The mixture was cooled, the product filtered, washes with water (50ml) and ethanol (5031), and dried to give 3.42g (87%) of the sodium salt of 1-(4-carboxyphenoxy)-10-(4-methoxyphenoxy)-decane (m.p. >300°c).

This compound was stirred with concentrated hydrochloric acid (50ml) and boiled under reflux with vigorous stirring for 2 hours. The mixture was cooled, filtered and the product was washed with water until the washings were neutral. After drying under vacuum at 60°C the product was crystallised from 20% aqueous ethanol to give 1-(4-carboxyphenoxy)10-(4-methoxyphenoxy)-decane (2.155., yield 67%), m.p. 1475־O°C.

Biological Data

The hypocholesterolaemic and/or hypotriglyceridaemic effects of several compounds of the present invention were demonstratedin the following experiment:

Groups of 8 male albino rats (C.F.Y. strain), weighing approximately 150 g., were given a powdered commercially available diet (oxoid) to which compounds. were added at level of either 0.1% or 0.25%. These diets were fed for seven days.

The rats were then killed and their serum total cholesterol and triglyceride were measured by the Technicon Autoanalyser. Table 1 shows the results expressed in terms of percentage cholesterol lowering and percentage triglyceride lowering compared with controls.

<td> Example No.</td><td> Level in diet(%)</td><td> Percentage lowering of serum cholesterol</td><td> Percentage lowering of serum triglycerides</td>

<td> 1</td><td> 0.25</td><td> 31</td><td> 71</td>

<td> 2</td><td> 0.25</td><td> 30</td><td> 48</td>

<td> 3.</td><td> 0.25</td><td> 32</td><td> ־ 79</td>

<td> 4</td><td> 0.25</td><td> 43</td><td> 74</td>

<td> 5</td><td> 0.10</td><td> 25</td><td> 66</td>

<td> 6.</td><td> 0.25 .v</td><td> 51</td><td> 59</td>

<td> 8.</td><td> 0.25</td><td> 14</td><td> 74</td>

<td> 9</td><td> 0.1</td><td> 42</td><td> 67</td>

<td> 10</td><td> 0.1</td><td> ׳12</td><td>⁴⁸</td>

<td> 11</td><td> 0.25</td><td> 13</td><td> 61 .</td>

<td> 14</td><td> 0.10</td><td> 31</td><td> 68</td>

<td> 15</td><td> 0.10</td><td> 16</td><td> 42</td>