A Photocatalyzed Synthesis of Naphthalenes by Using Aniline as a Traceless Directing Group in [4 + 2] Annulation of Amino-benzocyclobutenes with Alkynes
作者:Qile Wang、Nan Zheng
DOI:10.1021/acscatal.7b00716
日期:2017.6.2
We report a visible-light-promoted synthesis of substituted naphthalenes via [4 + 2] annulation of amino-benzocyclobutenes with alkynes. Amino-benzocyclobutenes, which are conveniently synthesized by [2 + 2] cycloaddition of arynes with ketenes followed by reductive amination, undergo regioselective opening of the cyclobutenyl ring to reveal a presumably distonic radical cation upon photooxidation