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.
发现通过使用 Corey 的 8-苯基薄荷基作为这些酯中的手性 O-烷基,重氮芴与手性丙烯酸酯或富马酸酯衍生物的 1,3-偶极环加成反应的光学产率显着提高。所得环丙烷的绝对立体化学与 Walborsky 等人提出的“重氮交换”机制所预期的不同。