Asymmetric first total syntheses and assignment of absolute configuration of oxazinin-5, oxazinin-6 and preoxazinin-7
作者:Dattatraya H. Dethe、Alok Ranjan、Vijendra H. Pardeshi
DOI:10.1039/c1ob06320k
日期:——
Asymmetric first total syntheses of the unprecedented toxins oxazinin-5, oxazinin-6 and preoxazinin-7 have been achieved from a common key intermediate 18, derived from a regiocontrolled Sharpless asymmetric aminohydroxylation and oxa-Michael reaction, which in addition to confirming the structure also established the absolute configuration of the natural products. On the way an expeditious synthesis of a metabolite bursatellin was completed in 8 steps.
不对称的首次总合成了前所未有的毒素oxazinin-5、oxazinin-6和preoxazinin-7,这些都来源于一个共同的关键中间体18,该中间体是通过区域选择性Sharpless不对称氨基羟基化和氧-迈克尔反应得到的。这不仅确认了化合物的结构,还确立了这些天然产物的绝对构型。在此过程中,快速合成了代谢物bursatellin,完成了8个步骤。