| abstract |
Compounds of the formula where R1 and R2, independently are alkyl groups having 2 to 8 carbons; R3 is hydrogen or lower alkyl; X is S, O or N-R4 where R4 is hydrogen or lower alkyl; Y is pyridyl, thienyl, furyl, pyridazinyl, pyrimidinyl, and pyrazinyl; A is (CH2)n where n is 0-5, or lower branched chain alkyl, alkenyl having 2 to 6 carbons and 1 or 2 double bonds, alkynyl having 2 to 6 carbons and 1 or 2 triple bonds; B is hydrogen, COOH or a salt thereof, COOR5, CONR6R7, -CH2OH, CH2OR8, CH2OCOR8, CHO, CH(OR9)2, CHOR10O, -COR11, CR11(OR9)2, or CR11OR10O, where R5 is alkyl of 1 to 10 carbons, or cycloalkyl of 5 to 10 carbons, or R5 is phenyl or lower alkylphenyl, R6 and R7 independently are hydrogen, alkyl of 1 to 10 carbons, or cycloalkyl of 5 to 10 carbons, or phenyl or lower alkylphenyl, R8 is alkyl of 1 to 10 carbons, phenyl or lower alkylphenyl, R9 is lower alkyl, R10 is divalent alkyl radical of 2-5 carbons and R11 is alkyl, cycloalkyl or alkenyl containing 1 to 5 carbons, have retinoic acid like activity. |