A Synthesis of <scp>l</scp>-Vancosamine Derivatives from Non-Carbohydrate Precursors by a Short Sequence Based on the Marshall, McDonald, and Du Bois Reactions
作者:Kathlyn A. Parker、Wonsuk Chang
DOI:10.1021/ol035479p
日期:2003.10.1
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
[反应:请参阅文字]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。