The reaction of 21-bromo-3β-hydroxy-17α-methoxypregn-5-en-20-one (5) with NaOCH3 in MeOH under reflux gave the 21-aldehyde 9 in modest yield along with the 21-hydroxy derivative 6. The 21-acetates 8 and 13 were obtained in good yields by prolonged reaction of the 21-bromides 5 and 11 with CH3COO-.
21-
溴-3β-羟基-17α-甲氧基孕-5-en-20-酮(5)与NaOCH3在MeOH中在回流下反应,以中等收率得到21-醛9以及21-羟基衍
生物6。通过21-
溴化物5和11与CH3COO-的延长反应,以良好的收率获得21-乙酸酯8和13。