第 49 卷第 6 期 |  | Vol. 49 No. 6 | 2019 年 12 月 | Dec 2019 |
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所屬欄目:農藥及中間體
由膽甾醇制備2-苯亞甲基-5α-膽甾烷-3-酮 |
彭文宇1,袁江純1,李筱芳1,2,易平貴1,2*,陶洪文1,2*
(1. 湖南科技大學(xué) 化學(xué)化工學(xué)院,湖南 湘潭 411201;2. 理論有機化學(xué)與功能分子教育部重點(diǎn)實(shí)驗室,湖南 湘潭 411201) |
摘 要:以膽甾醇(4)為起始原料,通過(guò)10% Pd-C催化加氫還原合成5α-膽甾烷-3β-醇(3),3經(jīng)Jones試劑氧化反應,得到5α-膽甾烷-3-酮(2),2 經(jīng)NaOH催化與苯甲醛發(fā)生Claisen-Schmidt縮合生成2-苯亞甲基-5α-膽甾烷-3-酮(1)。對制備工藝進(jìn)行了優(yōu)化,確定加氫反應的條件為:乙醇溶液中,25℃反應20 h;Jones試劑氧化反應的條件為:丙酮溶液中30℃反應2 h;Claisen-Schmidt縮合反應的條件為:乙醇溶液中,在NaOH催化下先25℃反應2 h,再升溫至50℃反應3 h。優(yōu)化條件下,3步反應總收率74.7%。產(chǎn)物結構經(jīng)1H NMR、13C NMR和APCI-MS 確證。以膽甾醇(4)為起始原料,通過(guò)10% Pd-C催化加氫還原合成5α-膽甾烷-3β-醇(3),3經(jīng)Jones試劑氧化反應,得到5α-膽甾烷-3-酮(2),2 經(jīng)NaOH催化與苯甲醛發(fā)生Claisen-Schmidt縮合生成2-苯亞甲基-5α-膽甾烷-3-酮(1)。對制備工藝進(jìn)行了優(yōu)化,確定加氫反應的條件為:乙醇溶液中,25℃反應20 h;Jones試劑氧化反應的條件為:丙酮溶液中30℃反應2 h;Claisen-Schmidt縮合反應的條件為:乙醇溶液中,在NaOH催化下先25℃反應2 h,再升溫至50℃反應3 h。優(yōu)化條件下,3步反應總收率74.7%。產(chǎn)物結構經(jīng)1H NMR、13C NMR和APCI-MS 確證。 |
關(guān)鍵詞:5α-膽甾烷-3β-醇;5α-膽甾烷-3-酮;2-苯亞甲基-5α-膽甾烷-3-酮;Jones試劑;Claisen-Schmidt縮合 |
中圖分類(lèi)號:R978.7 文獻標識碼:A 文章編號:1009-9212(2019)06-0023-04 |
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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. |
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基金項目:湖南省教育廳一般項目(15C0560),2019年度大學(xué)生科研創(chuàng )新計劃(SYZ2019050)。
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作者簡(jiǎn)介:彭文宇(1993-),男,安徽安慶人,碩士研究生,研究方向:物理化學(xué)和有機化學(xué)(E-mail:1254421085@qq.com)。
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聯(lián) 系 人:易平貴,教授,博士,博士研究生導師,研究方向:物理化學(xué)、有機化學(xué)和藥學(xué)(E-mail:pgyi@hnust.edu.cn);陶洪文,講師,博士,研究方向:天然藥物化學(xué)和有機合成(E-mail:hongwtao@hnust.edu.cn)。
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收稿日期:2019-11-15
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