3??Methylthio??pyrano [4, 3??c] pyrazol??4 (2H)??ones from 3??(bis??methylthio) methylene??2H??pyran??2, 4??diones and hydrazines

YX Li, YM Wang, XP Yang, SH Wang…

文献索引：Li, Yu-Xin; Wang, You-Ming; Yang, Xiao-Ping; Wang, Su-Hua; Li, Zheng-Ming Heteroatom Chemistry, 2003 , vol. 14, # 4 p. 342 - 344

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被引用次数: 3

摘要

Abstract A useful synthesis of 3-methylthio-6-methyl-pyrano [4, 3-c] pyrazol-4 (2H)-ones via 3-(bis-methylthio) methylene-5, 6-dihydro-6-alkyl (aryl)-2H-pyran-2, 4-dione with hydrazine as well as methyl and phenyl hydrazines is described and the mechanism of the formation is discussed.© 2003 Wiley Periodicals, Inc. Heteroatom Chem 14: 342–344, 2003; Published online in Wiley InterScience (www. interscience. wiley. com). DOI 10.1002/hc. 10158