Enantioselective 1,3-Dipolar Cycloadditions of Diazoacetates with Electron-Deficient Olefins
作者:Mukund P. Sibi、Levi M. Stanley、Takahiro Soeta
DOI:10.1021/ol070364x
日期:2007.4.1
[reaction: see text] A general strategy for highly enantioselective 1,3-dipolarcycloaddition of diazoesters to beta-substituted, alpha-substituted, and alpha,beta-disubstituted alpha,beta-unsaturated pyrazolidinone imides is described. Cycloadditions utilizing less reactive alpha,beta-disubstituted dipolarophiles require elevated reaction temperatures, but still provide the corresponding pyrazolines