(2-chloro-3-oxo-1-alkenyl)bicyclo(3.3.0)octane derivative

摘要

There are disclosed a (2-chloro-3-oxo-1-alkenyl)-bicyclo[3.3.0 octene derivative represented by the formula: <IMAGE> wherein R1 represents -CH2CH2CH2COOR5, -CH2CH2-O-CH2COOR5, -CH=CHCH2COOR5 or -CH2CH2C 3BOND C-COOR5 group where R5 in the groups represents a hydrogen atom or an alkyl group having 1 to 6 carbon atoms; R2 represents a hydrogen atom, an acyl group having 1 to 7 carbon atoms, a tri(1 to 7 carbon atoms)-hydrocarbylsilyl group or a group forming an acetal bonding with an oxygen atom of a hydroxy group; R3 represents a straight or branched alkyl group having 3 to 10 carbon atoms, a cycloalkyl group having 4 to 7 carbon atoms, which may be substituted by at least one alkyl group having 1 to 4 carbon atoms, a straight or branched alkenyl group having 3 to 12 carbom atoms, a straight or branched alkynyl group having 3 to 8 carbon atoms, a phenyl group or a phenoxy group which may have substituents, an alkoxy group having 1 to 6 carbon atoms or an alkyl group substituted by a cycloalkyl group having 5 to 8 carbon atoms, and a process for preparing the same which comprises reacting an aldehyde represented by the formula: <IMAGE> wherein R1 and R2 have the same meanings as defined above, with kotophosphonate represented by the formula: <IMAGE> wherein R3 has the same meaning as defined above and R4 represents an alkyl group having 1 to 10 carbon atoms, in the presence of a base.