Functionalized 1-azaxanthones (5-oxo-5H-[1]-benzopyrano[2,3-b]pyridines) were prepared by TMSOTf-mediated condensation of 1,3-bis(trimethylsilyloxy)-1,3-butadienes with 3-cyanochromones and subsequent base-mediated domino ‘retro-Michael/nitrile-addition/heterocyclization’ reaction.
通过
TMSOTf介导的
1,3-双(三
甲基甲
硅烷氧基)-
1,3-丁二烯与3的缩合反应制备功能化的1-azaxanthones(5-oxo-5 H- [1]-
苯并
吡喃并[2,3- b ]
吡啶)。 -
氰基
色酮和随后的碱基介导的多米诺骨牌“复古迈克尔/腈加成/杂环化”反应。