Diisopropylethylamine: An effective catalyst for the introduction of the t-butyldimethylsilyl group
作者:Luciano Lombardo
DOI:10.1016/s0040-4039(00)99846-0
日期:1984.1
The rapid reaction of t-butyldimethylchlorosilane with alcohols catalysed by diisopropylethylamine at room temperature gave high isolated yields of the t-butyldimethylsilyl ethers.
叔丁基二甲基氯硅烷与二异丙基乙胺在室温下催化的醇快速反应,可得到高分离度的叔丁基二甲基甲硅烷基醚。
Generation and Reactivity of Oxazolidinone Derived N-Acyl Radicals
作者:Gary E. Keck、Mark C. Grier
DOI:10.1055/s-1999-2913
日期:——
The N-acyl(phenylseleno)oxazolidinone 5 was prepared (85% yield) by treatment of the lithium salt of oxazolidinone with triphosgene, followed by addition of benzeneselenol. Reduction of 5 with n-Bu3SnH/AIBN gave the N-formyloxazolidinone 6 (99%) and reaction with allyltri-n-butylstannane gave 7 (89%). Bimolecular additions to various alkenes using the N-acyl radical derived from oxazolidinone 5 were also studied. Best results were obtained with electron rich olefins, such as enol ether derivatives. Eight such additions are reported, with yields ranging from 51-90%. Two prochiral substrates showed significant levels of diastereoselectivity in reactions with 5/Bu3SnH.