scheme based on diastereoselective addition of an allenyl stannane to a lactaldehyde ether, the tungsten-catalyzed alkynol cycloisomerization, and the rhodium-catalyzed C-H insertion of a carbamate nitrogen. This sequence is a prototype for a new and efficient strategy for the synthesis of 3-amino sugar derivatives. The key intermediate was elaborated to the silyl ether of N,N-dimethyl vancosamine glycal
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氨基甲酸酯保护的1-vancosamine糖醛,被认为是vancosamine衍
生物的通用前体,是基于一种短方案制备的,该方案基于将亚丙基
锡烷烃非对映选择性加至乳醛醚中,
钨催化的炔基环异构化,以及
氨基甲酸酯氮的
铑催化的CH插入。该序列是合成3-
氨基糖衍
生物的新的有效策略的原型。关键中间体被精制为N,N-二甲基vancosamine glycal的甲
硅烷基醚。