Esters of p-carbonylphenoxy-isobutyric acids

Abstract

This invention is concerned with esters of p-carbonylphenoxy-isobutyric acids of the general formulae: ##STR1## WHEREIN R is a phenyl group substituted by one or two halogen atoms;R' is H, CH.sub.3, C.sub.6 H.sub.5, SCH.sub.3, OCH.sub.3, or, SO.sub.2 CH.sub.3 ;R" is CH.sub.3 or C.sub.2 H.sub.5 ;Y is C.sub.1 -C.sub.4 alkoxy, phenoxy, phenoxy substituted by one or two halogen atoms, or, OCH.sub.2 O--CO--C(CH.sub.3).sub.3 ;Z is C.sub.1 -C.sub.4 alkyl, phenyl or R;Nr.sub.1 r.sub.2 is N(CH.sub.3).sub.2 N(C.sub.2 H.sub.5).sub.2, morpholino, piperidino, azepino, pyrrolidino.This invention is also concerned with acid addition salts obtained from formula Ia compounds with acids.Compounds of formulae I and Ia are useful as hypocholesterolemiant and hypolipidemiant agents.

Description

This invention is concerned with esters of p-carbonylphenoxy-isobutyric acids.

This application is concerned with esters of the general formulae ##STR2## WHEREIN R is a phenyl group substituted by one or two halogen atoms;

R' is H, CH.sub.3, C.sub.6 H.sub.5, OCH.sub.3, or, SO.sub.2 CH.sub.3 ; R" is CH.sub.3 or C.sub.2 H.sub.5 Y is C.sub.1 - C.sub.4 alkoxy, phenoxy, phenoxy substituted by one or two halogen atoms, or OCH.sub.2 O--CO--C(CH.sub.3).sub.3 ; Z is C.sub.1 -C.sub.4 alkyl, phenyl, or, R.sub.1 Nr.sub.1 r.sub.2 is N(CH.sub.3).sub.2 N(C.sub.2 H.sub.5).sub.2, morpholino, piperidino, pyrrolidino, or, azepino.

This application is also concerned with acid addition salts obtained from formula Ia compounds with inorganic and organic acids.

All the compounds of formula I and Ia have useful therapeutic properties. All of them are lipids and cholesterol reducing agents, moreover they act as normolipidemiant and hypocho lesterolemiant agents. The acids (Y = OH): from which esters I and Ia derived, induce gastric ulcers when administered by oral route, while their ester derivatives I and Ia do not develop gastric ulcers.

Some acids of the isobutyric type have been previously disclosed or suggested. AINSWORTH et al, J. Med. Chem., (1967), 10, 158-161 described two acids, namely the p-hexanoyl- and p-octanoylphenoxyisobutyric acids. NAKANISHI (US patent No. 3 494957) suggested the p-acetylphenoxy-isobutyric acid. CRAGOE (US Pat. No. 3 704 314) suggested two acids, namely the p-butyrylphenoxy isobutyric acid and 2,3-dichloro -4-(2-methylenebutyryl-phenoxy-isobutyric acid, and an ester, namely the ethyl p-formylphenoxy-isobutyrate. On one hand these known acids present the disadvantage of inducing gastric ulcers, and on the other hand ethyl p-formylphenoxy-isobutyrate is less active than Clofibrate taken as a reference product. By halogen atoms I mean fluorine, chlorine, bromine and iodine atoms, the preferred halogen atom being chlorine. Thus, in the definition of R are included within the scope of this invention the 4-chlorophenyl, 3-chlorophenyl, 3,4-dichlorophenyl and 2,6-dichlorophenyl groups. The preferred R group is 4-chlorophenyl. The preferred R' and R" are respectively R' = H and R" = CH.sub.3.

The esters of formula I are more active than their homologue compounds in which R is alkyl or cycloalkyl such as cyclohexyl. Moreover when the esters are p-carbonylphenoxy-isobutyric acid aminoethyl esters (i.e. compounds of the formula Ia), it is noticed that the presence of the OCH.sub.2 CH.sub.2 NR.sub.1 R.sub.2 group enhances the hypocholesterolemiant and hypolipidemiant activities of the p-alkylcarbonyl compounds.

The preferred compound, that is to say the most useful therapeutically, is the isopropyl p-(4-chlorobenzoyl)-phenoxy-isobutyrate of formula I, which is coded as No. 178. Then comes the fumarate of .beta.-azepino-ethyl p-(4-chlorobenzoyl)-phenoxy-isobutyrate of formula Ia, which is coded as No. 229.

The isobutyric acids (Y=OH) can be synthesized according to a method known per se. The methods I recommend are summed up by the following reaction schemes A and B, scheme B being the preferred one since it gives higher yields than A. ##STR3##

The esters I and Ia are obtained from the acids by a known process. For instance the esters may be prepared by esterification from the corresponding acids or by transesterification from another ester. For obtaining esters Ia the transesterification method is preferred.

Preparation I

p-(4-Chlorobenzoyl)-phenoxy-isobutyric acid (Code No. 153) 1 mole of 4-hydroxy-4'-chlorobenzophenone is dissolved in anhydrous acetone and then 5 moles of powdered sodium hydroxide is added. The corresponding sodium phenate precipitates. Refluxing is effected, and then, 1.5 mole of CHCl.sub.3 diluted with anhydrous acetone is added and the resulting mixture is refluxed for 10 hours. After cooling, water is added, the acetone is evaporated, the aqueous phase is washed with ether and acidified and the organic phase is redissolved in ether and extracted into a solution of bicarbonate. The bicarbonate solution is then acidified to obtain the desired acid, having a melting point of 185.degree. C, with a yield of 75%.

Preparation II

Isopropyl (p-4-chlorobenzoyl)-phenoxy-isobutyrate ##STR4## 1 mole of the acid obtained in preparation I is converted into its acid chloride using thionyl chloride (2.5 moles). 1 mole of the acid chloride is then condensed with 1.05 mole of isopropyl alcohol in the presence of 0.98 mole of pyridine in an inert solvent such as benzene.

Since traces of SO.sub.2 (which has a bad smell) may be obtained from the thionyl chloride; it is preferable to avoid this disadvantage by carrying out the esterification directly.

In table I, I have given examples of p-carbonylphenoxy-isobutyric acids which are used as intermediate compounds for the preparation of the esters according to this invention. They have been obtained according to reaction scheme A or B.

Tables II and III are respectively concerned with esters of formula I and esters of formula Ia. I have given in table IV reference or comparison products. Moreover, p-alkylcarbonyl-phenoxy-isobutyric acid esters of table IV may be used for preparing the corresponding esters Ia by transesterification.

TABLE I______________________________________ ##STR5##______________________________________ Melting orEx- Code Boilingample No. R R' R" point______________________________________Ex 1 82 CH.sub.3 CH.sub.2 H CH.sub.3 F=96.degree. CEx 2(a) C.sub.6 H.sub.5 H CH.sub.3Ex 3(b) CH.sub.3 (CH.sub.2).sub.4 H CH.sub.3Ex 4(b) CH.sub.3 CH.sub.2).sub.6 H CH.sub.3Ex 5(c) CH.sub.3 H CH.sub.3Ex 6(a)(d) CH.sub.3 (CH.sub.2).sub.2 H CH.sub.3 F=88.degree. CEx 7 153 4-ClC.sub.6 H.sub.4 H CH.sub.3 F=185.degree. CEx 8 198 CH.sub.3 (CH.sub.2).sub.3 H CH.sub.3 F=62.degree. CEx 9 243 CH.sub.3 3-CH.sub.3 CH.sub.3 F=98.degree. CEx 10 -- CH.sub.3 2-C.sub.6 H.sub.5 CH.sub.3 F=106.degree. CEx 11 305 4-ClC.sub. 6 H.sub.4 H C.sub.2 H.sub.5 F=140.degree. CEx 12 406 3-ClC.sub.6 H.sub.4 H CH.sub.3 F=121.degree. CEx 13 404 3,4-Cl.sub.2C.sub.6 H.sub.3 H CH.sub.3 F=155.degree. CEx 14 401 2,6-Cl.sub.2C.sub.6 H.sub.3 H CH.sub.3 F=196.degree. CEx 15 391 cyclohexyl H CH.sub.3 F=146.degree. CEx 16 -- CH.sub.3 3-SO.sub.2 CH.sub.3 CH.sub.3 --______________________________________ Notes- (a) disclosed in my previous U.S. Pat. Application Ser. No. 8071 (b) disclosed by AINSWORTH (c) suggested by NAKANISHI (d) suggested by CRAGOE TABLE II__________________________________________________________________________ ##STR6##__________________________________________________________________________ Melting or Code BoilingExample No. R R' Y point__________________________________________________________________________Ex 17 162 4-ClC.sub.6 H.sub.4 H OCH.sub.5 F=89.degree. CEx 18 163 4-ClC.sub.6 H.sub.4 H OC.sub.2 H.sub.5 F=79.degree. CEx 19 178 4-ClC.sub.6 H.sub.4 H OCH(CH.sub.3).sub.2 F=78.degree. CEx 20 217 4-ClC.sub.6 H.sub.4 H p-OC.sub.6 H.sub.4 Cl F=135.degree. CEx 21 403 3-ClC.sub.6 H.sub.4 H OCH(CH.sub.3).sub.2 F=79.degree. CEx 22 405 3,4-Cl.sub.2C.sub.6 H.sub.3 H OCH(CH.sub.3).sub.2 F=69.degree. CEx 23 402 2,6-Cl.sub.2C.sub.6 H.sub.3 H OCH(CH.sub.3).sub.2 F=115.degree. CEx 24 253 4-ClC.sub.6 H.sub.4 3-CH.sub.3 OCH(CH.sub.3).sub.2 --Ex 25 297 4-ClC.sub.6 H.sub.4 H OCH.sub.2 OCOC(CH.sub.3).sub.3 F=80.degree. C__________________________________________________________________________ table iii______________________________________ ##STR7##______________________________________ melting or Code BoilingEx No. Z R' OCH.sub.2 CH.sub.2 NR.sub.1 R.sub.2 point______________________________________Ex 26 208 C.sub.6 H.sub.5 H ##STR8## F = 100.degree. CEx 27 209 C.sub.6 H.sub.5 H ##STR9## F = 118.degree. CEx 28 210 CH.sub.3 H ##STR10## F = 134.degree. CEx 29 211 C.sub.6 H.sub.5 H ##STR11## F = 115.degree. CEx 212 C.sub.6 H.sub.5 H OCH.sub.2 CH.sub.2 NEt.sub.2 F = 62.degree. C30 maleateEx 31 229 4-ClC.sub.6 H.sub.4 H ##STR12## F = 120.degree. CEx 230 4-ClC.sub.6 H.sub.4 H OCH.sub.2 CH.sub.2 NEt.sub.2 F = 104.degree. C32 HClEx 33 231 4-ClC.sub.6 H.sub.4 H ##STR13## F = 116.degree. CEx 232 CH.sub.3 (CH.sub.2).sub.3 H OCH.sub.2 CH.sub.2 NEt.sub.2 F = 72.degree. C34 HClEx 35 233 CH.sub.3 (CH.sub.2).sub.3 H ##STR14## F = 118.degree. CEx 36 239 4-ClC.sub.6 H.sub.5 H ##STR15## F = 145.degree. C______________________________________ table iv__________________________________________________________________________reference, comparison and/or other intermediate compounds ##STR16## Melting or Code BoilingExample No. R R' Y point__________________________________________________________________________Ex 37 (c) 180 C.sub.6 H.sub.5 H OCH.sub.3 F = 58.degree. CEx 38 (a) 186 C.sub.6 H.sub.5 H OC.sub.2 H.sub.5 F = 87.degree. CEx 39 (a) 190 C.sub.6 H.sub.5 H OCH(CH.sub.3).sub.2 F = 84.degree. CEx 40 -- CH.sub.3 H OC.sub.2 H.sub.5 E.sub.0.03 = 120.degree. CEx 41 -- CH.sub.3 CH.sub.2 CH.sub.2 H OC.sub.2 H.sub.5 E.sub.0.005 = 144.degree. CEx 42 140 CH.sub.3 H OCH.sub.3 F = 62.degree. CEx 43 188 CH.sub.3 (CH.sub.2).sub.3 H OCH.sub.3 E.sub. 0.05 = 147 - 9.degree. CEx 44 187 CH.sub.3 (CH.sub.2).sub.3 H OC.sub.2 H.sub.5 E.sub.0.05 = 157 - 8.degree. CEx 45 189 CH.sub.3 (CH.sub.2).sub.3 H OCH(CH.sub.3).sub.2 E.sub.0.05 = 156 - 7.degree. CEx 46 -- H H OC.sub.2 H.sub.5 --Ex 47 390 cyclohexyl H OCH(CH.sub.3).sub.2 F = 148.degree. CEx 48 238 4-ClC.sub.6 H.sub.5 H ##STR17## F = 144.degree. C HClEx 49 240 CH.sub.3 3-CH.sub.3 OCH.sub.3 E.sub.0.05 = 132.degree. CEx 50 241 CH.sub.3 3-CH.sub.3 OC.sub.2 H.sub.5 E.sub.0.05 = 136.degree. CEx 51 242 CH.sub.3 3-CH.sub.3 OCH(CH.sub.3).sub.2 E.sub.0.05 = 139.degree. CEx 52 -- CH.sub.3 3-SCH.sub.3 OCH(CH.sub.3).sub.2 E.sub.1 = 198.degree. CEx 53 -- CH.sub.3 3-SO.sub.2 CH.sub.3 OCH(CH.sub.3).sub.2 F = 86.degree. CEx 54 -- CH.sub.3 2-C.sub.6 H.sub.5 OCH(CH.sub.3).sub.2 F = 95.degree. C__________________________________________________________________________ Notes (a) and (c) see table I The hypolipemiant and hypocholesterolemiant properties were exhibited in the rat. Each batch of rats (15 animals) is put on a fast at time t = 0. A blood sample is taken at time t + 15 hours, and then each product being tested is immediately administered orally. A new blood sample is taken at time t + 39 hours. The variation (diminution) in the total amount of blood cholesterol and total amount of blood lipids is measured between t + 15 hours and t + 39 hours, and this variation is expressed in % in Table V in which the results obtained with the products according to this invention and reference products are shown.

The invention also relates to therapeutic compositions containing, in combination with a physiologically acceptable excipient, at least one compound of formula I or Ia or one of their non-toxic acid-addition salts.

TABLE V______________________________________ variation variationExample dosage cholesterol lipids(Code No.) mg/kg % %______________________________________Ex 19 (178) 50 - 30 - 32Ex 21 (403) 100 - 21 - 18Ex 22 (405) 100 - 10 - 4Ex 23 (402) 100 - 9 - 5Ex 27 (209) 75 - 19 - 34Ex 31 (229) 50 - 35 - 34Ex 36 (239) 50 - 18 - 22Ex 24 (253) 70 - 15 - 25Ex 28 (210) 400 - 35 - 16Ex 35 (233) 300 - 16 - 15Ex 38 (186) 100 - 21 - 32Ex 39 (190) 50 - 30 - 32Ex 40 300 - 28 - 34Ex 41 400 - 22 - 31Ex 47 (390) 100 N.S. - 3______________________________________

Claims

1. A novel ester of p-carbonylphenoxy-isobutyric acid having the formula ##STR18## wherein R is a phenyl group substituted by one or two halogen atoms;

R' is H, CH.sub.3, C.sub.6 H.sub.5, SCH.sub.3, OCH.sub.3, or, SO.sub.2 CH.sub.3 ;

R" is CH.sub.3 or C.sub.2 H.sub.5 ; and

Y is C.sub.1- C.sub.4 alkoxy, phenoxy, phenoxy substituted by one or two halogen atoms, or, OCH.sub.2 O-CO-C (CH.sub.3).sub.3.

2. A novel ester according to claim 1 having the formula ##STR19## wherein R is 4-ClC.sub.6 H.sub.4, 3-ClC.sub.6 H.sub.4, 3,4-(Cl).sub.2 - C.sub.6 H.sub.3 and 2,6-(Cl).sub.2 - C.sub.6 H.sub.3, and, Y is OCH.sub.3, OC.sub.2 H.sub.5, OCH(CH.sub.3).sub.2.

3. An ester of p-carbonylphenoxy-isobutyric acid according to claim 1 wherein R is 4-chlorophenyl.

4. An ester of p-carbonylphenoxy-isobutyric acid according to claim 1 wherein R is 3,4-dichlorophenyl.

5. Isopropyl p-(4-chlorobenzoyl)phenoxy-isobutyrate.

6. A therapeutic composition useful for treating patients in order to reduce their blood cholesterol and lipids content, which comprises, in association with a pharmaceutically acceptable excipient, a therapeutically effective amount of at least a compound according to claim 1.