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Paper | Regular issue | Vol 92, No. 7, 2016, pp.1215-1223
Published online, 28th April, 2016
DOI: 10.3987/COM-16-13477
Efficient One-Pot Synthesis of Benzo[e]pyrazolo[1,5-c][1,3]thiazine Derivatives under Copper-Catalyzed Conditions

Jiyang Jie, Haoyi Li, Meihui Piao, and Xiaobo Yang*

*College of Chemistry & Chemical Engineering, Shenyang Normal University, 253 Huanghe North Street Shenyang, China

Abstract

An efficient method has been developed for the synthesis of benzo[e]pyrazolo[1,5-c][1,3]thiazines via one-pot two-step reactions of readily available substituted 1-(2-halophenyl)-3-akylprop-2-yn-1-ones, hydrazine hydrochloride and β-oxodithioesters under mild conditions, and the corresponding benzo[e]pyrazolo[1,5-c][1,3]thiazines were obtained in good to excellent yields. The novel method affords a new strategy for the construction of diverse and useful poly N,S-heterocyclic compounds.