作者:U. Murali Krishna
DOI:10.1016/j.tetlet.2010.02.075
日期:2010.4
An elegant approach for stereocontrolled synthesis of furopyran (hexahydro-2H-furo[3,2-b]pyran) building blocks was reported. The key steps in the sequence involved an efficient intramolecular 3-oxidopyrylium-alkene [5+2] cycloaddition for the synthesis of cycloadduct 6 and Beckmann fragmentation of ketoxime 13 to yield the furopyrans (5a–c).
报道了一种立体控制合成呋喃喃(六氢-2 H-呋喃[3,2- b ]吡喃)结构单元的方法。序列中的关键步骤涉及有效的分子内3-氧代氧化烯-烯烃[5 + 2]环加成反应,以合成环加合物6和贝克曼裂解酮肟13,从而产生呋喃吡喃(5a – c)。