A novel Selectfluor-mediated copper-catalyzed highly selective benzylic C–O cyclization for the synthesis 4H-3,1-benzoxazines is reported. The predominant selectivity for a benzylic C(sp3)–H over an aromatic C(sp2)–H bond in N-o-tolylbenzamides is achieved.
报道了一种新颖的Selectfluor介导的铜催化的高选择性苄基C–O环化反应,用于合成4 H -3,1-苯并恶嗪。在N - o-甲苯基苯甲酰胺中,相对于芳族C(sp 2)-H键,苄基C(sp 3)-H具有主要的选择性。
Experimental and computational studies on H<sub>2</sub>O-promoted, Rh-catalyzed transient-ligand-free <i>ortho</i>-C(sp<sup>2</sup>)–H amidation of benzaldehydes with dioxazolones
We develop an efficient and convenient ligand-free, rhodium-catalyzed ortho-C(sp2)–H amidation of benzaldehydes with dioxazolones using H2O as the key promoter.
TBHP/CoCl<sub>2</sub>-Mediated Intramolecular Oxidative Cyclization of<i>N</i>-(2-Formylphenyl)amides: An Approach to the Construction of 4<i>H</i>-3,1-Benzoxazin-4-ones
作者:Junchao Yu、Daisy Zhang-Negrerie、Yunfei Du
DOI:10.1002/ejoc.201501359
日期:2016.1
The intramolecular oxidativecyclization of N-(2-formylphenyl)amides has been realized through an oxidative C(sp2)–O(sp2) bond-forming reaction between an aldehyde carbon and amide oxygen. This new strategy, which uses tert-butyl hydroperoxide (TBHP) as an oxidant and CoCl2 as the catalyst, allows for the efficient Co-catalyzed synthesis of useful benzoxazin-4-one derivatives and features readily available