作者:Robert K. Boeckman、Hui Wang、Kyle W. Rugg、Nathan E. Genung、Ke Chen、Todd R. Ryder
DOI:10.1021/acs.orglett.6b03137
日期:2016.12.2
The convergent total synthesis of the manzamine alkaloid (−)-nakadomarin A (1) is described. The retrosynthetic analysis recognized spirocycle 3, assembled via an organocatalyst-promoted Michaeladdition/cyclization between bicyclic lactam 4 and furan aldehyde 5, both accessible from achiral starting materials and on a multigram scale. Lactam 4 is assembled through an SN2′/reduction/Staudinger/retro-aza-Claisen
描述了manzamine生物碱(-)-nakadomarin A(1)的会聚全合成。逆向合成分析确认了螺环3,其通过有机催化剂促进的双环内酰胺4和呋喃醛5之间的迈克尔加成/环化而组装,两者均可从非手性起始原料获得并且以克数表示。内酰胺4通过S N 2'/还原/ Staudinger /复古-氮杂-Claisen序列按比例组装。螺环化后,nakadomarin的合成仅需六个步骤即可完成。
Total synthesis of (−)-nakadomarin A: alkyne ring-closing metathesis
作者:Pavol Jakubec、Andrew F. Kyle、Jonás Calleja、Darren J. Dixon
DOI:10.1016/j.tetlet.2011.09.016
日期:2011.11
A 13-step, highly stereoselective synthesis of (−)-nakadomarin A has been achieved using the combination of a bifunctional organocatalyst controlled Michael addition, a nitro-Mannich/lactamization cascade, an alkyne ring-closing metathesis/syn-reduction, and furan/iminium ion cyclization/reduction as key steps.