Regioselective synthesis of 5,6-polymethylene-3-cyanopyridine-2(1H)-thiones and fused heterocycles based on them
作者:L. A. Rodinovskaya、E. V. Belukhina、A. M. Shestopalov、V. P. Litvinov
DOI:10.1007/bf01169725
日期:1994.3
6-polymethylene-3-cyanopyridine-2(1H)-thiones which were regioselectively alkylated at the sulfur atom by alkyl halides. Derivatives of 3-cyanopyridine-2(1H)-thione and 2-alkylthio-3-cyanopyridine were used for regioselective synthesis of substituted heterocycles: 3-aminothieno[2,3-b]pyridines, pyrido[2,3∶2′,3′]thieno[4,5-d]pyrimidines, and pyrido[2,3∶2′,3′]thieno[4,5-d]oxazines.
2-羟基亚甲基环戊烷-1-酮或-环辛烷-1-酮钠盐与氰硫代乙酰胺缩合得到5,6-聚亚甲基-3-氰基吡啶-2(1H)-硫酮,其在硫原子上被卤代烷区域选择性烷基化。3-氰基吡啶-2(1H)-硫酮和2-烷硫基-3-氰基吡啶的衍生物用于区域选择性合成取代杂环:3-氨基噻吩并[2,3-b]吡啶、吡啶并[2,3∶2'、 3']噻吩并[4,5-d]嘧啶和吡啶并[2,3∶2',3']噻吩并[4,5-d]恶嗪。