Employment of nitriles in the stereoselective cycloaddition to nitrones
作者:Ralf Plate、Pedro H. H. Hermkens、Jan M. M. Smits、Rutger J. F. Nivard、Harry C. J. Ottenheijm
DOI:10.1021/jo00382a014
日期:1987.3
Asymmetric Catalysis by Vitamin B12: The isomerization of achiral cyclopropanes to optically active olefins
作者:Thomas Troxler、Rolf Scheffold
DOI:10.1002/hlca.19940770502
日期:1994.8.10
Achiral spiroactivated cyclopropanes are isomerized to opticallyactive (R)-(cycloalk-2-enyl)-Meldrum's acids ( = (R)-5-(cycloalk-2-enyl)-2,2-dimethyl-1,3-dioxane-4,6-diones) in high yield and ee's up to 86% by catalytic amounts of cob(I)alamin in polar protic solvents.