Chem. J. Chinese Universities ›› 2014, Vol. 35 ›› Issue (2): 286.doi: 10.7503/cjcu20130535

• Organic Chemistry • Previous Articles     Next Articles

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)

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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