Unexpected observations during the total synthesis of calothrixin B–sodium methoxide as a source of hydride
作者:Shrikar M. Bhosale、Aadil A. Momin、Shrikant Kunjir、P.R. Rajamohanan、Radhika S. Kusurkar
DOI:10.1016/j.tetlet.2013.10.140
日期:2014.1
During the total synthesis of calothrixin B, various novel and unexpected results were noticed such as cleavage of C–N bond in imine using sodium cyanoborohydride, sodium methoxide as a hydride source for reduction, deformylation in the presence of bromine, and deacylation using ceric ammonium nitrate (CAN). A detailed mechanism has been proposed for the unexpected results and a few of them are generalized
在全合成Calothrixin B的过程中,发现了各种新颖而出乎意料的结果,例如使用氰基硼氢化钠将亚胺中的C–N键裂解,使用甲醇钠作为氢化物源进行还原,在溴存在下进行甲酰化以及使用铈铵进行脱酰作用硝酸盐(CAN)。对于意外结果,已经提出了详细的机制,并且对其中的一些进行了概括。已经进行了温度依赖性NMR研究,以确认合成序列中的中间体之一的结构。