A Benzannulation Strategy for Rapid Access to Quinazoline-2,4-diones via Oxidative N-Heterocyclic Carbene Catalysis
作者:Arghya Ghosh、Sayan Shee、Akkattu T. Biju
DOI:10.1021/acs.orglett.2c00954
日期:2022.4.15
benzannulation of enals with suitably substituted pyrimidine-2,4-diones allowing the mild and facile synthesis of functionalized quinazoline-2,4-diones is presented. This oxidative transformation proceeds via the simultaneous generation of dienolates and α,β-unsaturated acylazoliums and follows a vinylogous Michael/aldol/β-lactonization/decarboxylation/oxidation sequence to afford quinazoline-2,4-diones
介绍了 N-杂环卡宾催化的形式 [4+2] 烯醛与适当取代的 pyrimidine-2,4-diones 的苯环化反应,从而可以温和而简便地合成官能化的 quinazoline-2,4-diones。这种氧化转化通过同时产生二烯醇化物和 α,β-不饱和酰基唑鎓进行,并遵循乙烯基 Michael/aldol/β-内酯化/脱羧/氧化序列,得到喹唑啉-2,4-二酮,包括具有合适取代的轴向手性二酮,在一个操作简单的过程中。此外,取代香豆素作为二烯醇化物前体提供了benzochromen-6-one 衍生物。