Unsymmetrical polyheteropolyene: a versatile building block for the preparation of pyrrolo[2,1-b]thiazoles and 2H-thiopyrano[2,3-b]pyridines
作者:Cyrille Landreau、Pascal Janvier、Karine Julienne、Jean Claude Meslin、David Deniaud
DOI:10.1016/j.tet.2006.07.037
日期:2006.9
The synthesis of two classes of bisheterocyclic compounds, pyrrolothiazoles and thiopyranopyridines, is reported. The 4-dimethylamino-2-dimethylaminomethylenamino-1-thiabuta-1,3-diene 1 is used like a useful building block for the chemoselective synthesis of these heterocycles. Indeed, synthon 1 can react as thiazabutadiene or thiabutadiene form to afford either five- or six-membered ring monocyclic
据报道,合成了两类双环化合物,吡咯并噻唑和硫代吡喃吡啶。4-二甲基氨基-2-二甲基氨基亚甲基氨基-1-噻唑-1,3-二烯1用作这些杂环化学选择合成的有用组成部分。实际上,合成子1可以噻唑丁二烯或噻丁二烯的形式反应,以提供五元或六元环单环氮杂二烯,它们本身是双环结构的前体。进行了半经验计算以解释这种有效的化学选择性。