Intramolecular Copper-Catalyzed Asymmetric Propargylic [4 + 2]- Cycloaddition toward Optically Active Tetrahydroisoindolo[2,1-<i>a</i>]quinoxalines
作者:Ling Li、Xiu-Shuai Chen、Xiang-Ping Hu
DOI:10.1021/acs.orglett.2c02155
日期:2022.7.29
An intramolecular Cu-catalyzed asymmetric propargylic [4 + 2] cycloaddition of bis-N-nucleophile-functionalized propargylic esters has been realized in the support of a chiral tridentate N-ligand, (S,S)-Pybox-diOAc, leading to chiral tetrahydroisoindolo[2,1-a]quinoxalines in high yields and with good to excellent enantioselectivities. The reaction features high efficiency, simplicity, and broad substrate
在手性三齿 N-配体 ( S , S )-Pybox-diOAc 的支持下,实现了双-N-亲核试剂官能化的炔丙基酯的分子内 Cu 催化的不对称炔丙基 [4 + 2] 环加成反应,从而产生手性四氢异吲哚[2,1- a ]喹喔啉的收率高,对映选择性良好。该反应具有高效、简单和广泛的底物范围,从而为立体选择性获得原本难以合成的光学活性多环杂环骨架提供了强大而简洁的策略。