TRICARBONYL(ETA(6)ARENE)CHROMIUM(0) COMPLEXES AS CHIRAL AUXILIARIES -ASYMMETRIC-SYNTHESIS OF BETA-AMINOESTERS AND BETA-LACTAMS BY REFORMATSKY CONDENSATION
C. Baldoli et al., TRICARBONYL(ETA(6)ARENE)CHROMIUM(0) COMPLEXES AS CHIRAL AUXILIARIES -ASYMMETRIC-SYNTHESIS OF BETA-AMINOESTERS AND BETA-LACTAMS BY REFORMATSKY CONDENSATION, Tetrahedron, 52(13), 1996, pp. 4849-4856
Highly stereoselective syntheses (e.e. > 98%) of beta-aminoesters and
beta-lactams were accomplished using enantiomerically pure tricarbonyl
(eta(6)benzaldimine)chromium complexes in a Reformatsky type reaction
promoted by ultrasound. A correlation between the configuration of co
mplexed imines and absolute configuration of beta-lactam derivatives i
s reported.