| abstract |
For the preparation of compounds according to Formula (III), FORMULA (III). A: CH = CH or S; W, O; X, S, O or NR2; wherein R2 is hydrogen or C1-C6 alkyl; Y is CH or N; R is optionally mono or di-substituted naphthyl, thienyl or phenyl with C1-C3 alkyl, CF3, C1-C3 alkoxy, F, CI or bromine; R1 is hydrogen or C1-C6 alkyl; n means 1-3, characterized in that a compound according to Formula (IV) in which A, W, X, Y, R, R1 and n is defined as above is reduced with metallic aluminum in a protic solvent. FORMULA (IV). |