Efficient synthesis of novel thieno[3,2-b]-, [2,3-c]- and [3,2-c]pyridones by Sonogashira coupling of bromothiophenes with terminal alkynes and subsequent intramolecular C–N bond-forming reaction
作者:Viktor O. Iaroshenko、Sajid Ali、Tariq Mahmood Babar、Muhammad S.A. Abbasi、Vyacheslav Ya Sosnovskikh、Alexander Villinger、Andrey Tolmachev、Peter Langer
DOI:10.1016/j.tet.2013.02.069
日期:2013.4
Sonogashira conditions (PdCl2(PPh3)2, CuI) followed by subsequent addition of amines or ammonium to the intermediate thienyl acetylenes represents a novel access to a wide range of thieno[3,2-b]-, [2,3-c]-, and [3,2-c]pyridones under basic conditions and in excellent yields.
在Sonogashira条件下,使用三乙胺或二异丙基胺(PdCl 2(PPh 3)2,CuI)将溴噻吩与末端炔烃偶联,随后将胺或铵加到中间的噻吩基乙炔中,代表了广泛获得噻吩并[[thiono]]的新途径。 3,2- b ]-,[2,3- c ]-和[3,2- c ]吡啶酮在碱性条件下且收率很高。