A novel synthesis of quinazolinequinone and carbazolequinone through anionic cycloaddition: Its application to a synthesis of murrayaquinone A
A novel synthesis of the quinazolinequinone (5) and the carbazolequinone (9) is described. Anionic cycloaddition of the heterocyclic esters (1 and 6) with phenyl β-trimethylsilylvinyl sulfone (2c) afforded the cycloadducts (3 and 7), which were converted