Stereoselective Synthesis of Highly Functionalized Nitrocyclopropanes through the Organocatalyic Michael‐Addition‐Initiated Cyclization of Bromonitromethane and β,γ‐Unsaturated α‐Ketoesters
A highly diastereo‐ and enantioselective cyclopropanation of β,γ‐unsaturated α‐ketoesters with bromonitromethane has been successfully developed through a domino Michael‐addition/intramolecular‐alkylation strategy. Acceptable yields (up to 89 %) and enantioselectivities (up to 96 % ee) have been obtained.
Phosphine‐Catalyzed Enantioselective (3+2) Annulation of Vinylcyclopropanes with Imines for the Synthesis of Chiral Pyrrolidines
作者:Fuhao Zhang、Xuan Dai、Lei Dai、Wenrui Zheng、Wai‐Lun Chan、Xiaodong Tang、Xumu Zhang、Yixin Lu
DOI:10.1002/anie.202203212
日期:2022.6.13
building blocks in organic chemistry. In this study, the first phosphine-catalyzed enantioselective (3+2) annulationbetween vinylcyclopropanes and N-tosylaldimines was achieved, which led to the formation of a range of highly functionalized pyrrolidines in high yields with excellent diastereo- and enantioselectivities.