Organocatalytic enantioselective [2 + 4]-annulation of γ-substituted allenoates with<i>N</i>-acyldiazenes for the synthesis of optically active 1,3,4-oxadiazines
Xing Guo, Xuling Chen, Yuyu Cheng, Xiaoyong Chang, Xuechen Li, Pengfei Li
Abstract
An enantioselective [2 + 4]-annulation of γ-substituted allenoates with N-acyldiazenes has been developed for the first time. In the presence of an l-proline-derived DMAP analogue, the annulation proceeded smoothly to afford a broad range of 1,3,4-oxadiazine derivatives in good to excellent yields with high stereoselectivities.
Topics & Concepts
Enantioselective synthesisAnnulationOptically activeChemistryCombinatorial chemistryStereochemistryCatalysisOrganic chemistryCatalytic C–H Functionalization MethodsOxidative Organic Chemistry ReactionsCyclopropane Reaction Mechanisms