A simple and efficient method for direct sulfenylation of 4H-pyrido[1,2-a]pyrimidin-4-ones with sulfonyl hydrazides has been developed. The transformation is catalyzed by iodine under metal-free conditions with high regioselectivity and good functional-group tolerance.

中文翻译：

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碘催化区域选择性磺酰化 4H-Pyrido[1,2-a]pyrimidin-4-ones 与磺酰肼

已经开发了一种简单有效的方法，用于 4H-吡啶并 [1,2-a] 嘧啶-4-酮与磺酰肼的直接磺基化。该转化在无金属条件下由碘催化，具有高区域选择性和良好的官能团耐受性。