Significant steroids: effective and general synthesis of 4α- and 4β-amino-5α-androstanes
作者:Xianbing Ke、Hao Hu、Keda Zhang、Wenjin Xu、Qifeng Zhu、Lamei Wu、Xianming Hu
DOI:10.1039/b817910g
日期:——
4α-Aminosteroids were synthesized by the substitution of a 2α-bromo ketone using K2CO3 as an activator; 4β-aminosteroids were synthesized in excellent yields by a highly regioselective and trans-stereospecific ring opening of a steroidal 3,4α-epoxide using ZnCl2âH2O as a catalyst.