Chemical Research in Chinese Universities ›› 2020, Vol. 36 ›› Issue (5): 847-852.doi: 10.1007/s40242-019-0011-8

• Articles • Previous Articles     Next Articles

Green and Efficient Synthesis of 3-Pyrazolyl Indoles in Water

ZHAO Yanhui1, YU Haifeng1, LIAO Peiqiu2, WANG Wenju1   

  1. 1. College of Chemistry, Baicheng Normal University, Baicheng 137000, P. R. China;
    2. Jilin Province Key Laboratory of Organic Functional Molecular Design & Synthesis, Faculty of Chemistry, Northeast Normal University, Changchun 130024, P. R. China
  • Received:2019-10-20 Revised:2019-12-11 Online:2020-10-01 Published:2020-10-01
  • Contact: YU Haifeng, WANG Wenju E-mail:yuhf68105@sina.com;wangwj3309@163.com
  • Supported by:
    Supported by the National Natural Science Foundation of China(No.20902010) and the Foundation of Science and Technology Research Projects of the 13th Five-year Plan of Jilin Provincial Department of Education, China(No.2016037).

Abstract: A green and efficient synthesis of 3-pyrazolyl indoles was developed by the cyclocondensation reaction of β-ethylthio-β-indolyl-α,β-unsaturated ketones with semicarbazide hydrochloride as hydrazine equivalent in the presence of 3 equiv. of PEG-400(1a/PEG mole ratio of 1:3) in reflux water. This procedure did not require toxic hydrazine and product purification, eliminating the use of toxic liquid chemicals.

Key words: 3-Pyrazolyl indole, Green synthesis, Semicarbazide hydrochloride, Polyethylene glycol, Hydrazine equivalent