rearranged thieno[2,3-b]indolizines, as described previously by us, but were ordinary dehydrogenated compounds, pyrido[2,1-c]thieno[3,2-e][1,4]thiazines. In contrast with pyrido[2,1-c]thieno[3,2-e][1,4]thiazine derivatives which have no substituent or only one methyl group on the pyridine ring, their 6,8-dimethyl compounds could be smoothly converted by keeping them at room temperature or heating their
重新研究了标题化合物与 2,3-二
氯-4,5-二
氰基-
对苯醌的反应;发现相应的产物不是我们之前描述的环缩和重排的
噻吩并[2,3-b]
吲哚嗪,而是普通的脱氢化合物,
吡啶并[2,1-c]
噻吩并[3,2] -e][1,4]
噻嗪。与
吡啶环上没有取代基或只有一个甲基的
吡啶并[2,1-c]
噻吩并[3,2-e][1,4]
噻嗪衍
生物相比,它们的6,8-二甲基化合物可以顺利合成通过将它们保持在室温下或将其
乙醇溶液加热转化为相应的脱
硫或重排的 6,8-二甲基
噻吩并 [2,3-b]
吲哚嗪衍
生物,产率中等至良好。这些
吡啶并[2,1-c]
噻吩并[3,2-e][1,4]
噻嗪和
噻吩并[2, 3-b]indolizines 主要基于元素分析和光谱检查;两种化合物的 X 射线分析最终证实了前一种结构,即
吡啶并 [2,1-c]
噻吩并 [3,2-e][1,4]
噻嗪。