Oxidative synthesis of benzo[1,4]oxazines from α-branched primary amines and ortho-benzoquinones
作者:Dhananjayan Vasu、Jamie A. Leitch、Darren J. Dixon
DOI:10.1016/j.tet.2019.130726
日期:2019.12
The efficient oxidative construction of benzo[1,4]oxazines from simple α-branched amines and ortho-benzoquinones is reported. The procedure pivots on a triethylamine and iodine mediated oxidative ring closure from the ketimine intermediate formed upon their condensation. This reaction was shown to tolerate a variety of α-branched benzylamines and downstream derivatization to substituted benzomorpholine