Trifluoromethanesulfonic Acid Catalyzed Synergetic Oxidative/[3+2] Cyclization of Quinones with Olefins
作者:Lingkui Meng、Guanghui Zhang、Chao Liu、Kun Wu、Aiwen Lei
DOI:10.1002/anie.201305885
日期:2013.9.23
The proton did it! Tetrahydrobenzodifurans have been synthesized through the trifluoromethanesulfonicacid (HOTf) catalyzed direct oxidative CH functionalization of benzoquinone with olefins. A variety of substituents were found to be tolerated, and a synergeticoxidative/[3+2] cyclization mechanism was proposed based on the experimental results.
Synergistic Oxidative Coupling–[3+2] Cyclization of Quinones with Olefins Promoted by Cerium(IV) Sulfate Tetrahydrate
作者:Xing Huo、Jizhong Fang、Lige Xu、Bowen Fang
DOI:10.1055/s-0036-1588781
日期:2017.7
A cerium(IV) sulfate tetrahydrate promoted oxidativecyclization of quinones with olefins is developed. It proceeds through a tandem [3+2]-cyclization–oxidative coupling–[3+2]-cyclization process, in which tetrahydrobenzodifurans were conveniently constructed in high yields. Moreover, this method exhibits a good functional-group tolerance and scalability.