treatment with some halogenated compounds e.g. phenacyl bromide, ethyl bromoacetate δ-bromoacetoacetanilide, ethyl δ-bromoacetoacetate and δ-bromo-β-oxo-butyronitrile into the corresponding polyfunctionally substituted 3-(thiazol-2′-yliene)pyridine derivatives, which could also be annulated into fused heterocyclic ring systems. Chemical and spectroscopic evidences for the structure of the new compounds
异
硫氰酸苯酯与Knovenagel缩合的活性亚甲基化合物1a-d的反应产生了不可分离的盐3a-d。后者在用某些卤代化合物(如
苯甲酰溴,
溴乙酸乙酯,δ-
溴乙酰
乙酰苯胺,δ-
溴乙酰乙酸乙酯和δ-
溴-β-氧代-
丁腈)处理后原位杂环化成相应的多官能取代的3-(
噻唑-2'- (亚苯基)
吡啶衍生物,其也可以被环化成稠合的杂环系统。描述了新化合物结构的
化学和光谱证据。