A new “one pot” preparation of 2-n,n-dialkylamino-1,3-benzoxazines and naphth[ 1,2-e][ 1,3]oxazines from corresponding ortho hydroxynitriles and phosgeniminium salts
Lewis Acid‐Mediated Cyanation of Phenols Using
<i>N</i>
‐Cyano‐
<i>N</i>
‐phenyl‐
<i>p‐</i>
toluenesulfonamide
作者:Wu Zhang、Tao Li、Qingli Wang、Wanxiang Zhao
DOI:10.1002/adsc.201900813
日期:2019.11.5
Lewisacid‐mediated cyanation of phenol derivatives with N‐cyano‐N‐phenyl‐p‐toluenesulfonamide (NCTS) has been developed. The reaction proceeded efficiently with high regioselectivity to produce aromatic nitriles in moderate to excellent yields, which provides a direct and practical access to valuable products.
N,N-Dimethylformamide was found to act as solvent and catalyst in the dehydration of aldoximes to nitriles. The reaction -required heating at 135 °C and yields of nitriles were moderate to good. (Benzylideneaminooxy)formaldehyde was detected as an -intermediate in one of the reactions.
发现 N,N-二甲基甲酰胺在醛肟脱水生成腈的过程中充当溶剂和催化剂。该反应需要在 135 °C 加热,腈的产率中等至良好。(亚苄基氨基氧基)甲醛在其中一个反应中被检测为中间体。
A new “one pot” preparation of 2-n,n-dialkylamino-1,3-benzoxazines and naphth[ 1,2-e][ 1,3]oxazines from corresponding ortho hydroxynitriles and phosgeniminium salts