化工进展

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1-苯基吲哚的合成

冯筱晴1.2,唐 龙1,王瑞瑞1,王羚竹1,宋国强1   

  1. 1常州大学制药与生命科学学院,江苏 常州 213164;2常州市药品制造与质量控制工程重点实验室, 江苏 常州 213164
  • 出版日期:2013-10-05 发布日期:2013-10-14

Synthesis of 1-phenylindole

FENG Xiaoqing1,2,TANG Long1,WANG Ruirui1,WANG Lingzhu1,SONG Guoqiang1   

  1. 1School of Pharmaceutical Engineering &Life Science,Changzhou University,Changzhou 213164,Jiangsu,China;2Changzhou’s Key Laboratory of Pharmaceutical Manufacture and Quality Control Engineering,Changzhou 213164,Jiangsu,China
  • Online:2013-10-05 Published:2013-10-14

摘要: 以二苯胺和乙二酰氯为起始原料经偶联、酰化、还原反应得到1-苯基吲哚,并探索了其影响因素。结果表明合成中间体N,N-二苯基-2-氯-2-氧代乙酰胺的较佳条件为:n(二苯胺):n(乙二酰氯)=1∶3,反应温度20~25 ℃,反应2.5 h,收率98.02%,HPLC纯度97.68%;产品1-苯基靛红的较优合成工艺条件为: n(N,N-二苯 基-2-氯-2-氧代乙酰胺) :n(无水AlCl3)=1∶3,反应温度10 ℃,反应时间2 h,收率86.76%,HPLC纯度98.45%;目标产物1-苯基吲哚的最佳工艺条件为:n(1-苯基靛红):n(硼氢化钠)=1∶3,n(1-苯基靛红):n(氯化锌)=1∶0.05,反应温度110 ℃,反应时间12 h,收率72.41%,HPLC纯度98.14%。产品及中间体结构经1H NMR、MS和显微熔点仪分析表征确认。

关键词: 二苯胺, N, N-二苯基-2-氯-2-氧代乙酰胺, 1-苯基靛红, 1-苯基吲哚, 合成

Abstract: In this paper,n-phenylaniline and oxalyl chloride were used to prepare 1-phenylindole. The experimental conditions,such as material ratio,reaction time,the amount of catalyst and so on were investigated. The optimal conditions of the coupling reaction were found as:n(n-phenyl -aniline)∶n(oxalyl chloride) =1∶3,reaction temperature 20—25 ℃,reaction time 2.5 h,under which the yield of 1-(diphenylamino)-2-chloro-ethanedione was up to 98.02% based on n-phenyl -aniline and the purity was 97.68% as determined by HPLC. The best reaction conditions for preparing 1-phenyl isatin were found as:n(1-(diphenylamino)-2-chloro-ethanedione)∶n(Anhydrous AlCl3)=1∶3,reaction temperature 10 ℃,reaction time 2 h,under which the yield of 1-phenylisatin was 86.76% based on 1-(diphenylamino)- 2-chloro-ethanedione and the purity was 98.45% as determined by HPLC. The reduction reaction conditions were optimized as:n(1-phenylisatin)∶n(sodium borohydride) = 1∶3,n(1-phenylisatin)∶n(zinc chloride) = 1∶0.05,reaction temperature 110 ℃,reaction time 12 h,under which the yield of 1-phenylisatin was 72.41% based on 1-phenylisatin and the purity was 98.14% as determined by HPLC. The structures of the product were identified by 1H NMR,MS and Micro melting point instrument.

Key words: n-phenylaniline, 1-(diphenylamino)-2-chloro-ethanedione, 1-phenylisatin, 1-phenylin- dole, synthesis