通过使苯甲酰基丙酮与二甲基甲酰胺二甲基乙缩醛反应,然后在干燥的DMF中用氰基硫代乙酰胺9a,氰基乙酰胺9b和丙二腈二聚体9c的阴离子处理,来制备多取代的吡啶11a,c和12。当反应在乙醇作为溶剂和哌啶作为碱中进行时,得到14a,b。噻吩并吡啶16A,B是由pyridinethiones的反应制备11A和14A与2-氯Ñ - p -甲苯基-乙酰胺(15)。噻吩并吡啶16a,b的进一步反应用DMFDMA或亚硝酸分别得到17a,b和18a,b。吡啶衍生物11c与肼和苯肼反应,得到三环化合物19a,b。
Dimethylformamide dimethyl acetal in heterocyclic synthesis: Synthesis of polyfunctionally substituted pyridine derivatives as precursors to bicycles and polycycles
作者:Fathi A. Abu-Shanab、A. M. Hessen、S. A. S. Mousa
DOI:10.1002/jhet.5570440406
日期:2007.7
11a,c and 12 were prepared by the reaction of benzoylacetone with dimethylformamide dimethyl acetal followed by treatment with cyanothioacetamide 9a, cyanoacetamide 9b and the anion of malononitrile dimmer 9c in dry DMF. When the reaction was carried out in ethanol as a solvent and piperidine as a base afforded 14a,b. Thienopyridines 16a,b were prepared by the reaction of pyridinethiones 11a and 14a with
通过使苯甲酰基丙酮与二甲基甲酰胺二甲基乙缩醛反应,然后在干燥的DMF中用氰基硫代乙酰胺9a,氰基乙酰胺9b和丙二腈二聚体9c的阴离子处理,来制备多取代的吡啶11a,c和12。当反应在乙醇作为溶剂和哌啶作为碱中进行时,得到14a,b。噻吩并吡啶16A,B是由pyridinethiones的反应制备11A和14A与2-氯Ñ - p -甲苯基-乙酰胺(15)。噻吩并吡啶16a,b的进一步反应用DMFDMA或亚硝酸分别得到17a,b和18a,b。吡啶衍生物11c与肼和苯肼反应,得到三环化合物19a,b。