Enantioselective catalytic epoxidation of cinnamate esters
作者:Eric N. Jacobsen、Li Deng、Yoshiro Furukawa、Luis E. Martínez
DOI:10.1016/s0040-4020(01)89369-8
日期:1994.4
A broad study of the (salen)Mn(III)-catalyzedasymmetric epoxidation of cis-cinnamate esters reveals that the steric properties of the ester group have a profound influence on enantioselectivity in the epoxidation reaction, with bulkier esters affording highest ee's. The sensitivity of the reaction selectivity to the steric properties of the cis-alkene are consistent with a “skewed” side-on approach
ENANTIOSELECTIVE DARZENS REACTION : ASYMMETRIC SYNTHESIS OF trans-GLYCIDIC ESTERS MEDIATED BY CHIRAL LITHIUM AMIDES
作者:Toshiya TAKAHASHI、Masami MURAOKA、Magdalena CAPO、Kenji KOGA
DOI:10.1248/cpb.43.1821
日期:1995.10.15
Enantioselective and diastereoselective Darzens reaction mediated by chiral lithium amides was achieved between tert-butyl chloroacetate and aromatic aldehydes to give the corresponding trans-glycidic esters in up to 84% enantiomeric excess.