Asymmetric Induction in 1,3-Dipolar Cycloaddition of Diazofluorene with Menthyl or 8-Phenylmenthyl Acrylate and Fumarate Derivatives
作者:Keiji Okada、Fumio Samizo、Masaji Oda
DOI:10.1246/cl.1987.93
日期:1987.1.5
Optical yields in the 1,3-dipolar cycloaddition of diazofluorene with chiral acrylate or fumarate derivatives were found to be considerably improved by use of Corey’s 8-phenylmenthyl group as a chiral O-alkyl group in these esters. The absolute stereochemistry of resulting cyclopropanes is different from the one expected from the “diazo-exchange” mechanism proposed by Walborsky et al.
Asymmetric transformation in photoequilibrium systems: diastereoselective isomerization of N-(R)-(+)-α-arylethylfluorene-9-spiro-1′-cyclopropane-2′-carboxamide derivatives
作者:Keiji Okada、Fumio Samizo、Masaji Oda
DOI:10.1039/c39860001044
日期:——
Photochemically induced asymmetrictransformation in the isomerizations of N-(R)-(+)-α-arylethylfluorene-9-spiro-1′-cyclopropane-2′-carboxamidederivatives showed moderate to high diastereoselectivity.