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Substrate-Controlled Synthesis of Spirocyclo­propyl­pyrazolones and Bicyclic 4,5-Dihydropyrazoles from 1,2-Diaza-1,3-dienes with Sulfur Ylides

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journal contribution
posted on 21.06.2018, 12:24 by Jiaan Shao, Wenteng Chen, Menghao Zhao, Ke Shu, Huan Liu, Pai Tang
Substrate-controlled reactions have been developed for the synthesis of spirocyclo­propyl­pyrazolones and bicyclic 4,5-dihydropyrazoles from 1,2-diaza-1,3-dienes and sulfur ylides. These protocols were carried out under mild reaction conditions without any additives in generally moderate to good yields. Plausible mechanisms for the transformations were proposed.