Diastereoselective addition of chiral azomethine ylides to cyclic α,β-unsaturated N-enoylbornanesultams
作者:Staffan Karlsson、Hans-Erik Högberg
DOI:10.1039/b200579d
日期:2002.4.9
Doubly diastereoselective 1,3-dipolar cycloaddition reactions of chiral non-racemic azomethine ylides to cyclic five- and six-membered α,β-unsaturated N-enoylbornanesultams were carried out. When suitable solvents were used, the fused bicyclic adducts formed were obtained in good diastereoselectivity. Moreover, a change of the absolute configuration of the starting ylide precursor reversed the diastereoselectivity
非外消旋的双非对映选择性1,3-偶极环加成反应 甲亚胺盐进行了对五元和六元环状α,β-不饱和N-烯酰基冰片烷磺酰胺的合成。什么时候合适溶剂通过使用,以良好的非对映选择性获得了形成的稠合双环加合物。而且,改变了启动的绝对配置叶立德前体逆转了某些此类反应的非对映选择性。裂解所提供的环加合物的手性助剂氨基醇和β-氨基酯。后者被转化为抗菌化合物的已知前体。