A novel and practical protocol for the synthesis of fully substituted pyrazoles from pyridinium 1,4-zwitterionic thiolates and hydrazonoyl chlorides in excellent yields under mild conditions is described. The transformation proceeds via an unusual [[3 + 3] - 1] pathway, which involves a formal [3 + 3] cascade cyclization followed by a spontaneous ring-contraction/sulfur extrusion reaction from 4H-1,3,4-thiadiazine intermediates.

中文翻译：

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通过[[3 + 3]-1]途径从吡啶鎓1,4-两性离子硫醇盐和酰氯酰氯合成全取代的吡唑。

描述了一种新颖实用的方案，可在温和的条件下以极佳的收率由吡啶鎓1,4-两性离子硫醇盐和酰氯合成全取代的吡唑。转化是通过不寻常的[[3 + 3]-1]途径进行的，该途径涉及正式的[3 + 3]级联环化，然后由4H-1,3,4-噻二嗪中间体进行自发的环收缩/硫磺挤出反应。