INDOLYLACETIC ACID DERIVATIVES

1336913 Indolylacetic acid derivatives SUMITOMO CHEMICAL CO Ltd 24 Aug 1971 [26 Aug 1970 27 Aug 1970 3 Oct 1970 9 Dec 1970 (3) 15 Feb 1971 16 Feb 1971] 39709/71 Heading C2C Novel compounds I and their salts in which X 1 and X 2 are O or CH 2 ; A is a saturated or unsaturated hydrocarbon chain of up to 5C optionally substituted by halo or phenyl; m is 0 or 1; n is 1 or 2; R 1 and R 2 are H or 1-4C alkyl; R 3 is 1-4C alkyl; 3-7C cycloalkyl; aryl optionally substituted by a hydrocarbon group, 1-4C alkoxy, 1-4C alkylthio, NO 2 , CN, CF 3 , -OCH 2 O-, -OCH 2 CH 2 O- or halo; a saturated or unsaturated mono- or polycyclio alicyclic group which may be substituted by halo, alkyl or phenyl or be condensed with a benzene ring; an alkyl group substituted by such an alicyclic group; or a heterocyclic ring with 5 or 6 ring members optionally substituted by CH 3 , C 2 H 5 or halo; and R 4 is H, 1-4C alkyl or a cation; are prepared by treating compounds II wherein B is 2H or a nitrogen protecting system with compounds III Compounds II may be prepared by treating compounds IV with compounds V, R 3 -(A) n -COhal. Compounds IV where B is other than 2H may be prepared by treating the appropriate compounds IV where B is 2H with a suitable protecting system. Pharmaceutical compositions having antiinflammatory, analgesic and antipyretic activities when administered orally comprise a compound I together with a suitable excipient.