Efficient syntheses of 2-(2,6-dichloro-4-trifluoromethyl-phenyl)tetrahydrocyclopenta, tetrahydrothiopyrano, hexahydrocycloheptapyrazoles and tetrahydroindazoles
作者:Sanath K. Meegalla、Dario Doller、Ruiping Liu、Deyou Sha、Richard M. Soll、Dale S. Dhanoa
DOI:10.1016/s0040-4039(02)02158-5
日期:2002.11
Two methods are described for the regiospecificsynthesis of 3,4-fused-cycloalkyl-1-arylpyrazoles; the key step is the reactionbetween aryl hydrazines and cyclic α-(dimethoxymethyl)ketones. The latter are obtained by BF3-promoted alkylation of ketones with trimethylorthoformate.