Facile Routes to Alkoxymaleimides/Maleic Anhydrides
作者:Narshinha P. Argade、Manoj Kumar Sahoo、Santosh B. Mhaske
DOI:10.1055/s-2003-37351
日期:——
New routes to alkoxymaleic anhydrides 1a/b have been described in good yields via base-induced chemoselective vinylic substitution of bromo atom in bromomaleimide 4 with alkanols, and base-induced oxa-Micahel addition of alkanols to dialkyl acetylenedicarboxylates 8a/b as key steps. An unusual acyl exchange in the conversion of 6a/b to 1a/b under very simple and mild reaction conditions is noteworthy.
Syntheses of Papyracillic Acids: Application of the Tandem Chain Extension–Acylation Reaction
作者:Jennifer R. Mazzone、Charles K. Zercher
DOI:10.1021/jo3017617
日期:2012.10.19
A synthetic approach to the papyracillic acid family of natural products has been developed. The spiroacetal core is rapidly assembled through an unprecedented zinc carbenoid-mediated tandem chain extension–acylation reaction. Subsequent functional group manipulation provided access to papyracillic acid B and 4-epi-papyracillic acid C. The successful preparation of these molecules resulted in the clarification
已经开发出一种合成天然产物的纸草酸家族的方法。螺缩醛核心通过前所未有的类卡宾锌介导的串联链延伸-酰化反应快速组装。随后的官能团操作提供了获得纸莎草酸 B 和 4- epi-纸莎草酸 C 的途径。这些分子的成功制备导致该天然产物家族成员的结构分配的澄清。