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.
Reactivity Umpolung of the C═N Bond in Quinoxaline Scaffold Enabling Direct Nucleophilic Attack of Alkyl Grignard Reagents at the N-Terminus
作者:Yun Peng、Lailin Chen、Hanyang Bao、Bingwei Zhou、Huayue Wu、Yunkui Liu
DOI:10.1021/acs.orglett.2c01385
日期:2022.6.10
The reactivity umpolung of the C═N bond in the quinoxaline scaffold has been successfully realized for the first time by introduction of a formyl or an acyl group adjacent to the C-position of the C═N moiety. The reversed reactivity of the C═N bond thus enabled direct nucleophilicattack of alkyl Grignard reagents at the N-terminus rather than the C-terminus, thereby providing an unprecedented and
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。
Kovacs; Tombacz, Acta Physica et Chemica, 1950, vol. <II> 3, p. 35