Some Reactions of 3 β-Mesyloxycholestane-5α,6β-diol and Cholest-2-ene-5α,6β-diol Acetates
作者:P. Tsui、G. Just
DOI:10.1139/v73-521
日期:1973.11.1
Reaction of 3β-mesyloxycholestane-5α,6β-diol 6-monoacetate (1e) with potassium t-butoxide gave the 3α,5α-oxycholestan-6β-ol (4a), which rearranged further to 5β,6β-epoxycholestan-3-ol (5). Treatment of 1c with triethylamine gave cholest-2-ene-5α,6β-diol diacetate (7a), whereas heating diacetate 1c in pyridine–dimethylformamide gave cholestan-3α,5α,6β-triol 3,6-diacetate (2a). Cholest-2-ene-5α,6β-diol
3β-mesyloxycholestane-5α,6β-diol 6-monoacetate (1e) 与叔丁醇钾反应得到 3α,5α-oxycholestan-6β-ol (4a),其进一步重排为 5β,6β-epoxycholestan-3-ol (5). 用三乙胺处理 1c 得到胆甾醇-2-烯-5α,6β-二醇二乙酸酯 (7a),而在吡啶-二甲基甲酰胺中加热二乙酸酯 1c 得到胆甾烷-3α,5α,6β-三醇 3,6-二乙酸酯 (2a)。Cholest-2-ene-5α,6β-diol diacetate (7a) 与间氯过苯甲酸反应得到 α-环氧化物 10。7a 与 N-溴琥珀酰亚胺水溶液反应得到 2β-bromo-3α-hydroxy-5α,6β-双乙酰氧基胆甾烷 (8)。环氧化物 10 和溴醇 8 在酸性介质中都重排为四氢呋喃 11。