A Shorter Synthesis of Dithienopyridines Through Pd(0)-Catalyzed Coupling of 2-(2-Trimethylstannyl-3-thienyl)-1,3-dioxolane with<i>tert</i>- Butyl<i>N</i>-(<i>ortho</i>-Halothienyl)carbamates
作者:Youhua Yang、Anna-Britta Hörnfeldt、Salo Gronowitz
DOI:10.1055/s-1989-27172
日期:——
Less sterically crowded 2-(2-trimethylstannyl-3-thienyl)-1,3-dioxolane (4) was prepared and coupled with tert-butyl N-(ortho-halothienyl) carbamates, catalyzed by Pd(0) complex, to give dithieno[3,2-b; 2′,3′-d] pyridine (5), dithieno[3,4-b; 2′,3′-d]pyridine (6), and dithieno[2,3-b; 2′,3′-d]pyridine (7) in good yields.
在Pd(0)配合物的催化下,制备了空间位阻较小的2-(2-三甲基锡烷基-3-噻吩基)-1,3-二氧戊环(4),并将其与叔丁基N-(邻卤代噻吩基)氨基甲酸酯偶联,得到二噻吩并[3,2-b;2′,3′-d]吡啶(5)、二噻吩并[3,4-b;2′,3′-d]吡啶(6)和二噻吩并[2,3-b;2′,3′-d]吡啶(7),产率较高。