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Silver(I)-Catalyzed Facile Synthesis of Pyrazoles From Propargyl N-Sulfonylhydrazones

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posted on 20.06.2008, 00:00 by Young Tak Lee, Young Keun Chung
A silver(I)-catalyzed facile formation of pyrazoles from propargyl N-sulfonylhydrazones has been disclosed. During the reaction, a migration of sulfonyl groups (Ts, Ms) was observed. Good functional group compatibility was observed under mild reaction conditions (at room temperature for 3−5 h). This methodology allows for the efficient and regioselective synthesis of 1,3- and 1,5-disubstituted and 1,3,5-trisubstituted pyrazoles.