The thermolysis of several N-(4-chloro-5H-1,2,3-dithiazol-5-ylidene)pyridin-n-amines (where n = 2, 3 and 4) gives a mixture of thiazolopyridine-2-carbonitriles in low to moderate yields. Introduction, by design, of a chlorine substituent at the C2 or C4 position of N-(4-chloro-5H-1,2,3-dithiazol-5-ylidene)pyridin-3-amine and other selected azines enables a BnEt3NI mediated ANRORC style ring transformation that provides fourteen heteroazine fused thiazole-2-carbonitriles in moderate to near quantitative yields. The synthesis described herein therefore provides a facile high yielding two-step route to heteroazine fused thiazole-2-carbonitriles starting from 4,5-dichloro-1,2,3-dithiazolium chloride (Appel salt) and ortho- or para-chloro substituted meta-aminoazines.
通过热解几种 N-(4-
氯-5H-1,2,3-二
噻唑-5-亚基)
吡啶-n-胺(其中 n = 2、3 和 4),可以得到一种
噻唑并
吡啶-2-甲腈混合物,产率从低到中等。通过设计,在 N-(4-
氯-5H-1,2,3-二
噻唑-5-亚基)
吡啶-3-胺和其他选定的氮杂环胺的 C2 或 C4 位置引入
氯取代基,可以实现 BnEt3NI 介导的 ANRORC 式环转化,以中等至接近定量的产率提供 14 种杂环胺融合的
噻唑-2-碳腈。因此,本文所述的合成方法提供了一条从
4,5-二氯-1,2,3-二噻唑氯化物(阿佩尔盐)和正
氯或对
氯取代的偏
氨基嗪开始的两步法杂嗪融合
噻唑-2-甲腈的简便高产路线。