Chemical Research in Chinese Universities ›› 2013, Vol. 29 ›› Issue (5): 879-883.doi: 10.1007/s40242-013-3087-6

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Preparation of 3,4-Dihydropyrimidones via Biginelli Reaction in Efficient and Recyclable PEG1000-DAIL/Toluene Catalyst-mediumCombined Thermoregulated Biphasic System

WANG Ying-lei1, LUO Jun1, ZHI Hui-zhen2   

  1. 1. School of Chemical Engineering, Nanjing University of Science and Technology, Nanjing 210094, P. R. China;
    2. School of Chemical and Materials Science, Nanjing Normal University, Nanjing 210046, P. R. China
  • Received:2013-03-04 Revised:2013-04-03 Online:2013-10-01 Published:2013-09-17
  • Contact: LUO Jun E-mail:luojun@njust.edu.cn
  • Supported by:

    Supported by the National Natural Science Foundation of China(No.21002050).

Abstract:

A facile and efficient protocol for the synthesis of 3,4-dihydropyrimidones via one-pot Biginelli reaction in PEG1000-DAIL/toluene system was developed. PEG1000-DAIL/toluene mixture is a temperature-driven reversible biphasic system, which promises the fully display of catalytic activity and simple recycle of PEG1000-DAIL. As a result, PEG1000-DAIL/toluene mixture showed catalyst-medium double-duty in the Biginelli reaction and afforded corresponding 3,4-dihydropyrimidones in excellent yields of 80%―95% for 20 examples. No obvious loss of catalytic activity was observed even after 10 recycling runs.

Key words: Thermoregulated biphase, Ionic liquid, Multicomponent reaction, Biginelli reaction, Green chemistry, Catalysis