Similarly, the beta-ester 2c, gives 9a in toluene. The 1,2-dicarbonyl groups in 9a are determined to be cis oriented and the absolute stereochemistry of the cyclopropyl moiety was assigned to be (1S, 2R, 3S). The corresponding sultam ester 2n gives same diastereomeric product 10a with low chemical yield (40%). The beta propyl 2d gives 1S, 2S, 3S stereogenic centered configurated product 11a, where substituents on cyclopropane ring are trans to each other. The beta tertiary butyl 2g group does not gives product at all even prolong reaction time. For methyl 2j and a-bromo 2k substituents in toluene we observed high chemical yield (87% and 78%) as well as stereoselectivity (>99.5%), whereas in acetonitrile, the chemical yield as well as the selectivity is low. The -methyl substituted cyclopropane ring 16b is confirmed as 1R,2R by OTREP.