Chemoselective reaction of formalin with 2-(5-substituted-2-hydroxybenzylamino)phenols: Synthesis of 6-substituted 3-(2-hydroxyphenyl)-3,4-dihydro-2<i>H</i>-benzo[<i>e</i>][1,3]oxazines
作者:Ramaiyan Manikannan、Shanmugam Muthusubramanian
DOI:10.1002/jhet.5570450444
日期:2008.7
Reaction of 2-(5-substituted-2-hydroxybenzylamino)phenols (2) with formalin in ethanol under reflux has chemoselectively led to 2-(6-substituted-2H—benzo[e][1,3]oxazin-3(4H)-yl)phenols (3) in good yield involving the ring closure of the hydroxyl group of the C-aryl ring and not that of the N-aryl ring.
2-(5-取代的-2-羟基苄氨基)苯酚(2)与福尔马林在乙醇中的回流反应已化学选择性地生成了2-(6-取代的-2 H-苯并[ e ] [1,3]恶嗪-3( 4 H)-基)酚(3)的收率高,涉及C-芳基环的羟基的闭环而不是N-芳基环的羟基的闭环。