Ring-selective synthesis of O-heterocycles from acyclic 3-O-allyl-monosaccharides via intramolecular nitrone–alkene cycloaddition
作者:Tony K.M Shing、Yong-Li Zhong
DOI:10.1016/s0040-4020(00)01138-8
日期:2001.2
Intramolecular1,3-dipolarcycloadditions of nitrones formed from 3-O-allyl-d-glucose and d-altrose (both with threo-configuration at C-2,3) afford oxepanes selectively whereas the same reactions of nitronesderivedfrom 3-O-allyl-d-allose and d-mannose (both with erythro-configuration at C-2,3) give tetrahydropyrans selectively.