Reduction of Weinreb amides to aldehydes under ambient conditions with magnesium borohydride reagents
作者:Christopher L. Bailey、Jacob W. Clary、Chittreeya Tansakul、Lucas Klabunde、Christopher L. Anderson、Alexander Y. Joh、Alexander T. Lill、Natalie Peer、Rebecca Braslau、Bakthan Singaram
DOI:10.1016/j.tetlet.2014.12.066
日期:2015.1
[H3BNMe2]−, MgAB) is an analogue of the versatile lithium dialkylaminoborohydrides (LAB reagents), prepared by the reaction of dimethylamine-borane with methylmagnesium chloride. MgAB is a partial reducing agent for Weinreb amides under ambient conditions and is complementary to the commonly utilized lithium aluminum hydride (LiAlH4) and diisobutylaluminum hydride (DIBAL) reagents, while exhibiting enhanced
二甲基氨基硼氢化氯镁(ClMg + [H 3 BNMe 2 ] -,MgAB)是通用的二烷基氨基硼氢化锂(LAB试剂)的类似物,它是通过二甲基胺-硼烷与甲基氯化镁的反应制得的。MgAB在环境条件下是Weinreb酰胺的部分还原剂,与常用的氢化铝锂(LiAlH 4)和二异丁基氢化铝(DIBAL)试剂,同时展现出更高的化学选择性。为了防止过度还原,通过形成亚硫酸氢钠加合物容易地以高收率分离醛产物。醛产物既可以储存,也可以随后用作亚硫酸氢盐加合物,或者可以通过用甲醛水溶液处理从亚硫酸氢盐加合物再生。