Optimization of the Abnormal Beckmann Rearrangement: Application to Steroid 17-Oximes
作者:Cunde Wang、Xin Jiang、Haijian Shi、Jun Lu、Yuefei Hu、Hongwen Hu
DOI:10.1021/jo034142y
日期:2003.5.1
A novel and practical procedure was developed for the abnormalBeckmannrearrangement of steroid 17-oximes. Treatment of the 17-oximes with TFA/CH(OMe)(3) in boiling THF for 2 h gives the corresponding 13,17-seco alkene nitrile products in unprecedented high yields (70-92%). Since the alkene nitriles can be subsequently converted into 18-norsteroids, this general method provides a highly efficient