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。
Quinoxaline synthesis in novel tandem one-pot protocol
摘要:
A variety of quinoxalines were synthesized via tandem one-pot procedure for the first time in water medium. The key strategy was the in situ preparation of alpha-halo-beta-keto esters by the reaction of N-bromo succinimide with beta-keto esters and further condensation with phenylene diamines. This novel eco-friendly approach offers an easy, efficient, and mild synthesis of highly substituted quinoxalines in good yields. (C) 2011 Elsevier Ltd. All rights reserved.