高等学校化学学报 ›› 2014, Vol. 35 ›› Issue (2): 286.doi: 10.7503/cjcu20130535

• 有机化学 • 上一篇    下一篇

烯酸在碘化铵催化作用下的卤代内酯化反应

朱敏(), 金建昌, 张慧   

  1. 浙江树人大学生物与环境工程学院, 杭州 310015
  • 收稿日期:2013-06-05 出版日期:2014-02-10 发布日期:2013-07-29
  • 作者简介:联系人简介: 朱 敏, 女, 教授, 主要从事有机化学研究. E-mail:hzzm60@163.com
  • 基金资助:
    国家自然科学基金(批准号: 21072176)资助

Halolactonization of Alkenoic Acid Catalyzed by Ammonium Iodide

ZHU Min*(), JIN Jianchang, ZHANG Hui   

  1. College of Biological and Environmental Sciences, Zhejiang Shuren University, Hangzhou 310015, China
  • Received:2013-06-05 Online:2014-02-10 Published:2013-07-29
  • Contact: ZHU Min E-mail:hzzm60@163.com
  • Supported by:
    † Supported by the National Natural Science Foundation of China(No.21072176)

摘要:

研究了不饱和烯酸在碘化铵催化作用下的溴代和氯代内酯化反应. 通过该反应, 4-戊烯酸等不饱和烯酸在催化剂碘化铵和氧化剂间氯过氧苯甲酸作用下很容易与溴化锂和氯化锂反应, 常温下短时间内即可得到良好产率的溴/氯甲基γ-丁内酯化合物, 从而建立了一个简单快速合成溴/氯甲基γ-丁内酯的新方法. 考察了反应条件对反应的影响, 提出了该反应是经过有机高价碘中间体而进行的反应机理.

关键词: 催化内酯化反应, 有机高价碘中间体, 碘化铵, 4-戊烯酸

Abstract:

A novel halolactonization of pentenoic acids was developed, which was catalyzed by hypervalent iodine species generated in situ from ammonium iodide. In this protocol, 4-pentenoic acids reacted easily with lithium bromide or lithium chloride under catalyst ammonium iodide in combination with m-chloroperbenzoic acid(mCPBA) as the terminal oxidant in CH3CN at room temperature, which provided five-membered halolactones in moderate to good yields. A new plausible reaction pathway for the reaction was hypothesized. Thus, NH4I was first oxidized to I2 and HOI with mCPBA, both of them reacted with alkenoic acid to form the iodolactone, which then was transformed into the hypervalent iodine intermediate in situ by the continuing oxidation, and finally the halolactone was provided when lithium bromide or lithium chloride was acted as nucleophile in the following intermolecular nucleophilic substitution. This method has some advantages such as mild reaction conditions, simple procedure and good yields. Furthermore, the scope of hypervalent iodine reagents in organic synthesis could be extended.

Key words: Catalytic halolactonization, Hypervalent iodine intermediate, Ammonium iodide, 4-Pentenoic acid

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