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Issue 4, 2013
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One-pot synthesis of 2H-phenanthro[9,10-c]pyrazoles from isoflavones by two dehydration processes

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Abstract

An environmentally friendly and efficient method was developed for one-pot synthesis of a series of 2H-phenanthro[9,10-c]pyrazoles in EtOH by two dehydration processes. Firstly, 3,4-diaryl-1H-pyrazoles were synthesized by the cyclocondensation of isoflavones and hydrazine hydrate in refluxing EtOH. Secondly, the final target products 2H-phenanthro[9,10-c]pyrazoles were given by photocyclization and dehydration of 3,4-diaryl-1H-pyrazoles in 1 : 1 (v/v) EtOHH2O. The advantages of this method are catalyst-free, short synthetic routes, mild reaction conditions and easy work-up. In addition, the fluorescence properties of 2H-phenanthro[9,10-c]pyrazoles were determined.

Graphical abstract: One-pot synthesis of 2H-phenanthro[9,10-c]pyrazoles from isoflavones by two dehydration processes

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Publication details

The article was received on 25 Jan 2013, accepted on 10 Feb 2013 and first published on 05 Mar 2013


Article type: Paper
DOI: 10.1039/C3GC40205C
Green Chem., 2013,15, 1048-1054

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    One-pot synthesis of 2H-phenanthro[9,10-c]pyrazoles from isoflavones by two dehydration processes

    Q. Wang, Z. Zhang, Z. Du, H. Hua and S. Chen, Green Chem., 2013, 15, 1048
    DOI: 10.1039/C3GC40205C

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