Stereoselective Hydride Reductions of Cyclic N-Diphenylphosphinyl Imines. Highly Diastereoselective Syntheses of Protected Primary Amines
摘要:
Reduction of N-diphenylphosphinyl imines of variously substituted cyclohexanones, cyclopentanones, and bicyclic ketones with lithium tri-sec-butylborohydride provides highly diastereoselective procedures for the syntheses of N-diphenylphosphinyl amines which represent protected primary amines that can be unmasked by mild acidic cleavage. Attack of cyclohexyl derivatives occurs almost exclusively via equatorial approach to yield axial amine derivatives while cyclopentyl and bicyclic imines are attacked from the less sterically encumbered faces.
Mercury-Catalyzed Rearrangement of Ketoximes into Amides and Lactams in Acetonitrile
作者:Chennan Ramalingan、Yong-Tae Park
DOI:10.1021/jo070297k
日期:2007.6.1
An acetonitrile solution of mercury(II) chloride has been found to catalyze efficiently the conversion of a diverse range of ketoximes into their corresponding amides/lactams.