Nitrocyclopropane formation has been successfully carried outby reaction of bromonitromethane with electrophilic alkenes bearingtwo electron-withdrawing groups in the α- and β-positions,and in the presence of potassium carbonate as base. The method allowsgood yields and moderate to satisfactory diastereoselectivity withlinear alkenes, while shows the complete formation of the exo-product with N-alkylmaleimides.
A new method for the synthesis of Z-enediones via IBX-mediated oxidative rearrangement of 2-alkynyl alcohol systems
作者:Benedikt Crone、Stefan F. Kirsch
DOI:10.1039/b515838a
日期:——
o-Iodoxybenzoic acid (IBX) was found to mediate the conversion of alpha-alkynyl alcohols into Z-enediones under notably mild conditions via a novel rearrangement mechanism (33-65% yield, 13 examples).