A Concise and Versatile Double-Cyclization Strategy for the Highly Stereoselective Synthesis and Arylative Dimerization of Aspidosperma Alkaloids
作者:Jonathan William Medley、Mohammad Movassaghi
DOI:10.1002/anie.201200387
日期:2012.5.7
Building cycles: A strategy for the concise, stereoselective synthesis of aspidosperma alkaloids and related structures via a common putative diiminium ion intermediate is reported. The approach enables the dimerization of aspidosperma‐type structures at the sterically hindered C2 position. The intermediate is prepared in one step from the shown lactam through an electrophilic double‐cyclization cascade
构建循环:报告了一种通过常见的假定二亚胺离子中间体来简明、立体选择性地合成蜘蛛精生物碱和相关结构的策略。该方法能够在空间位阻 C2 位置实现无精子型结构的二聚化。中间体是从所示的内酰胺通过亲电双环化级联一步制备的(参见方案;Tf=三氟甲磺酰基)。