The palladium-catalyzed carbonylation of 2,6-dibromopyridine in the presence of primary amines under controlled conditions (carbon monoxide pressure) gives mainly N-aryl- or N-alkyl-6-bromopyridine-2-carboxamides accompanied by N,N′-diaryl- or N,N′-dialkylpyridine- 2,6-dicarboxamides. Further aminocarbonylation of the N-aryl- and N- alkyl-6-bromopyridine-2-carboxamides affords unsymmetric N,N′- diaryl, N-alkyl-N′-aryl-, or N,N′-dialkylpyridine-2,6-dicarboxamides.
在受控条件下(如
一氧化碳压力)下,
钯催化的2,6-二
溴吡啶与初级胺的羰基化反应主要生成N-芳基或N-烷基-6-
溴吡啶-2-羧酰胺,并伴有N,N′-二芳基或N,N′-二烷基
吡啶-2,6-二羧酰胺。对N-芳基和N-烷基-6-
溴吡啶-2-羧酰胺进行进一步的
氨基羰基化反应,可以得到不对称的N,N′-二芳基、N-烷基-N′-芳基或N,N′-二烷基
吡啶-2,6-二羧酰胺。