Selective Ketalization of Steroidal3,11,17-Trione using Chlorotrimethylsilane as Catalyst
摘要:
Selective ketalization of 13 beta-ethyl-gona-4-ene-3,11,17-trione (1) using chlorotrimethylsilane as catalyst afforded 13 beta-ethyl-gona-5-ene-3,11,17-trione-3-ethylene ketal (2) in fairly high yield. The corresponding 3,17-diethylene ketal (3) was obtained in 70% yield when p-toluenesulfonic acid was used as catalyst.
Selective Ketalization of Steroidal3,11,17-Trione using Chlorotrimethylsilane as Catalyst
摘要:
Selective ketalization of 13 beta-ethyl-gona-4-ene-3,11,17-trione (1) using chlorotrimethylsilane as catalyst afforded 13 beta-ethyl-gona-5-ene-3,11,17-trione-3-ethylene ketal (2) in fairly high yield. The corresponding 3,17-diethylene ketal (3) was obtained in 70% yield when p-toluenesulfonic acid was used as catalyst.