第 49 卷第 6 期Vol. 49 No. 6
2019 年 12 月Dec 2019

所属栏目:农药及中间体

由胆甾醇制备2-苯亚甲基-5α-胆甾烷-3-酮
彭文宇1,袁江纯1,李筱芳1,2,易平贵1,2*,陶洪文1,2* (1. 湖南科技大学 化学化工学院,湖南 湘潭 411201;2. 理论有机化学与功能分子教育部重点实验室,湖南 湘潭 411201)
摘 要:以胆甾醇(4)为起始原料,通过10% Pd-C催化加氢还原合成5α-胆甾烷-3β-醇(3),3经Jones试剂氧化反应,得到5α-胆甾烷-3-酮(2),2 经NaOH催化与苯甲醛发生Claisen-Schmidt缩合生成2-苯亚甲基-5α-胆甾烷-3-酮(1)。对制备工艺进行了优化,确定加氢反应的条件为:乙醇溶液中,25℃反应20 h;Jones试剂氧化反应的条件为:丙酮溶液中30℃反应2 h;Claisen-Schmidt缩合反应的条件为:乙醇溶液中,在NaOH催化下先25℃反应2 h,再升温至50℃反应3 h。优化条件下,3步反应总收率74.7%。产物结构经1H NMR、13C NMR和APCI-MS 确证。以胆甾醇(4)为起始原料,通过10% Pd-C催化加氢还原合成5α-胆甾烷-3β-醇(3),3经Jones试剂氧化反应,得到5α-胆甾烷-3-酮(2),2 经NaOH催化与苯甲醛发生Claisen-Schmidt缩合生成2-苯亚甲基-5α-胆甾烷-3-酮(1)。对制备工艺进行了优化,确定加氢反应的条件为:乙醇溶液中,25℃反应20 h;Jones试剂氧化反应的条件为:丙酮溶液中30℃反应2 h;Claisen-Schmidt缩合反应的条件为:乙醇溶液中,在NaOH催化下先25℃反应2 h,再升温至50℃反应3 h。优化条件下,3步反应总收率74.7%。产物结构经1H NMR、13C NMR和APCI-MS 确证。
关键词:5α-胆甾烷-3β-醇;5α-胆甾烷-3-酮;2-苯亚甲基-5α-胆甾烷-3-酮;Jones试剂;Claisen-Schmidt缩合
中图分类号:R978.7  文献标识码:A  文章编号:1009-9212(2019)06-0023-04
Preparation of 2-Benzylidene-5α-cholestan-3-one from Cholesterol
PENG Wen-yu1, YUAN Jiang-chun1, LI Xiao-fang1,2, YI Ping-gui1,2*, TAO Hong-wen1,2* (1. School of Chemistry and Chemical Engineering, Hunan University of Science and Technology, Xiangtan 411201, China; 2. Key Laboratory of Theoretical Organic Chemistry and Function Molecular of Ministry of Education, Xiangtan 411201, China)
Abstract:5α-Cholestane-3β-ol(3) was synthesized from cholesterol (4) by 10% Pd-C catalytic reduction, 5α-cholestane-3-one(2) was synthesized by Jones reagent oxidation of 3. And 2-benzylidene-5α-cholestan-3-one (1) was prepared by the Claisen-Schmidt condensation of 2 and benzaldehyde catalyzed by NaOH. The reaction process was optimized. The conditions of hydrogenation were 25℃ in ethanol solution for 20 h, and those of Jones reagent oxidation were 30℃ in acetone solution for 2 h. The reaction conditions of Claisen-Schmidt condensation were catalyzed by NaOH at 25℃ for 2 h and subsequent 50℃ for 3 h in ethanol solution. Under the optimized conditions, the total yield of the three-step reaction was 74.7%. The product structure was confirmed by 1H NMR, 13C NMR and APCI-MS.
Key words:5α-cholestane-3β-ol; 5α-cholestane-3-one; 2-benzylidene-5α-cholestan-3-one; Jones reagent; Clausen-Schmidt condensation.
基金项目:湖南省教育厅一般项目(15C0560),2019年度大学生科研创新计划(SYZ2019050)。
作者简介:彭文宇(1993-),男,安徽安庆人,硕士研究生,研究方向:物理化学和有机化学(E-mail:1254421085@qq.com)。
联 系 人:易平贵,教授,博士,博士研究生导师,研究方向:物理化学、有机化学和药学(E-mail:pgyi@hnust.edu.cn);陶洪文,讲师,博士,研究方向:天然药物化学和有机合成(E-mail:hongwtao@hnust.edu.cn)。
收稿日期:2019-11-15