A New Application of the Pictet-Spengler Reaction to the Preparation of 4-Substituted 1<i>H</i>-2,3-Benzoxazines
作者:Junbiao Chang、Kang Zhao、Xiufang Zheng、Xiaolei Wang
DOI:10.1055/s-2006-951564
日期:——
Intramolecular coupling reaction of benzylic O-hydrox-amates and aldehydes was investigated to afford a variety of 4-substituted 1H-2,3-benzoxazine ring systems in good to excellent yields. The reaction involved an intramolecular C-C bond formation between an N-acyl- or N-sulfonyl-oxoiminium ion with the aryl ring. Under the studied conditions, electron-donating groups in the aryl ring are essential
研究了苄基 O-异羟肟酸盐和醛的分子内偶联反应,以良好到极好的产率提供各种 4-取代的 1H-2,3-苯并恶嗪环系统。该反应涉及在 N-酰基-或 N-磺酰基-氧亚胺鎓离子与芳环之间形成分子内 CC 键。在所研究的条件下,芳环中的给电子基团对于所需的偶联反应是必不可少的。