通过在 C=N 部分的 C 位附近引入甲酰基或酰基,首次成功实现了喹喔啉支架中 C=N 键的反应性 umpolung。因此,C=N 键的反向反应性使得烷基格氏试剂能够在 N 端而不是 C 端直接进行亲核攻击,从而为合成 quinoxalin-2(1 H )-one提供了一种前所未有的有效方法涉及串联 N-烷基化/C─C 键断裂过程的衍生物。
One-potsynthesis: A sustainable and efficient protocol for the transition-metal-free one-potsynthesis of quinoxaline derivatives from lignin β-O-4 models and polymer in the presence of organic N-sources and KOH is presented. With this protocol, a wide range of functionalized quinoxalines are synthesized from lignin β-O-4 model compounds and β-O-4 polymer.