Structural Characterization of a Benzoxazinophenoxazine Formed as a By-Product During the Synthesis of a 3-Amino-<i>N</i>,<i>N</i>-dimethylsalicylamide
作者:Wendy Zhong、Jiong Yang、Bruce D. Hilton、Wenqing Feng、Gary E. Martin、Jianguo Yin、Kiran Muppalla、Weidong Tong、Xiaoyong Fu
DOI:10.1002/jhet.1077
日期:2013.3
highly colored by‐products were observed chromatographically during the synthesis of 3‐amino‐N,N‐dimethylsalicylamide. One of these, an oxidative dimerization products, bis‐(N,N‐dimethylcarboxamido)‐aminophenoxazinone, was previously isolated and characterized. A tris‐(N,N‐dimethylcarboxamido)‐benzoxazino[3,2‐b]phenoxazine, presumably a higher oxidation or further reaction product of the previously
在3-氨基-N,N-二甲基水杨酰胺的合成过程中,通过色谱法观察到了几种高度着色的副产物。其中一种是氧化二聚产物,双-(N,N-二甲基甲酰胺基)-氨基苯恶嗪酮,以前已经过分离和鉴定。三(N,N-二甲基甲酰胺基)苯并恶嗪[3,2- b ]苯恶嗪,据推测是先前分离和表征的2-氨基-3 H-苯恶嗪-3-one的较高氧化度或进一步反应的产物。通过质谱和多核NMR方法进行分离和表征。现在,我们希望传达该结构表征工作的结果。
Structural Characterization of a Phenoxazine Analog Formed as a By-product of the Synthesis of a 3-Amino-<i>N,N</i>-dimethylsalicylamide
作者:Wendy Zhong、Jiong Yang、Bruce D. Hilton、Gary E. Martin、Jianguo Yin、Kiran Muppalla、Weidong Tong、Xiaoyong Fu
DOI:10.1002/jhet.981
日期:2012.9
A highly colored impurity formed at low levels during the preparation of 3‐amino N,N‐dimethyl salicylamide was isolated and identified as 2‐amino‐N,N,N′,N′‐tetramethyl‐3‐oxo‐3H‐phenoxazin‐4,6‐dicarboxamide using mass spectrometry and two‐dimensional NMR methods that included long‐range 1H‐15N heteronuclear chemical shift correlation data to assemble the proton‐deficient “right‐half” of the 2‐aminophenoxazin‐3‐one
分离了3-氨基N,N-二甲基水杨酰胺制备过程中少量形成的高色杂质,并将其鉴定为2-氨基-N,N,N',N'-四甲基-3-氧代-3 H-苯恶嗪。使用质谱和二维NMR方法测得的‐4,6-二二甲酰胺包括长距离的1 H - 15 N异核化学位移相关数据,以组装2-氨基苯恶嗪-3-一的质子缺陷“右半”核。使用计算机辅助的结构阐明方法和合成方法独立确定了结构。