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
Total Synthesis of (±)-1-Acetylaspidoalbidine and (±)-1-Methylaspidospermidine
作者:Jian Jin、Fayang G. Qiu
DOI:10.1002/adsc.201300756
日期:2014.2.10
Abstract(±)‐1‐Acetylaspidoalbidine and (±)‐1‐methylaspidospermidine were synthesized from protected tryptamine through the combination of an organocatalytic Diels–Alder reaction, a tandem stereoselective ring‐opening reduction, and a double Michael addition.magnified image
Total Syntheses of Aspidospermidine, <i>N</i>-Methylaspidospermidine, <i>N</i>-Acetylaspidospermidine, and Aspidospermine via a Tandem Cyclization of Tryptamine-Ynamide
Stork-enamine alkylation of 1H-pyrrolo[2,3-d]carbazole derivatives, which were prepared through a Brønsted acid-catalyzed tandem cyclization of tryptamine-ynamide. The scalable synthesis of 1H-pyrrolo[2,3-d]carbazole afforded facile access and a practical approach to the Aspidosperma indolealkaloid family.
aspidospermidine、N- methylaspidospermidine、N- acetylaspidospermidine 和aspidospermine的全合成是从一个常见的五环二氢吲哚中间体实现的。常见的五环二氢吲哚中间体是通过 1 H-吡咯并[2,3- d ]咔唑衍生物的 Stork-烯胺烷基化以克规模合成的,这些衍生物是通过布朗斯台德酸催化的色胺-炔酰胺串联环化制备的。1 H-吡咯并[2,3- d ]咔唑的可扩展合成为曲霉属吲哚生物碱家族提供了简便的途径和实用的方法。