1,3-Dipolar Cycloadditions of Diazomethane to Chiral Electron-Deficient Olefins: The Origin of the π-Facial Diastereoselection
作者:Elena Muray、Angel Alvarez-Larena、Joan F. Piniella、Vicenç Branchadell、Rosa M. Ortuño
DOI:10.1021/jo991227j
日期:2000.1.1
The stereochemical outcome of diazomethane cycloadditions to several chiral electron-deficientolefins has been investigated in order to establish the origin of the pi-facial diastereoselection. Nitro olefins, vinyl sulfones, enoates, and 2-amino enoates have been used for such a purpose. These substrates have been prepared from D-glyceraldehyde acetonide through Wittig-type condensations and present