Selektive Addition von gasf�rmigem Chlorwasserstoff an kristalline Epoxide und Steroid-Epoxide
作者:Gerd Kaupp、Anke Ulrich、Gerhard Sauer
DOI:10.1002/prac.19923340503
日期:——
Solid epoxides add gaseous HCl or HBr regioselectively and without melting, if the melting points are sufficiently high. Such additions proceed diastereoselectively with chiral epoxides. These gas/solid reactions are compared to similar transformations in solution. One observes interesting reaction sequences in the conversions of steroidal epoxides. Thus, the opening of the epoxide ring may be followed by cationic rearrangements, or it occurs elimination of water, if it creates conjugation to a carbonyl group.