Iodine-Catalyzed, Stereo- and Regioselective Synthesis of 4-Arylidine-4H-benzo[d][1,3]oxazines and their Applications for the Synthesis of Quinazoline 3-Oxides
作者:Wen-Chun Lee、Ho-Chuan Shen、Wan-Ping Hu、Wei-Sheng Lo、Chebrolu Murali、Jaya Kishore Vandavasi、Jeh-Jeng Wang
DOI:10.1002/adsc.201200018
日期:2012.8.13
4-Benzylidene-2-aryl-4H-benzo[d][1,3] oxazines have been synthesized with high stereoselectivity and regioselectivities from 2-alkynylbenzamides in the presence of a catalytic amount of I2. In the reaction mechanism, iodine plays a key role in two different aspects as a catalyst, such as to activate the alkyne with the iodinium donor which triggers the cascade, and then as a proper acid source to facilitate
在催化量的I 2存在下,由2-炔基
苯甲
酰胺以高的立体选择性和区域选择性合成了4-
苄基-2-芳基-4 H-
苯并[ d ] [1,3]恶嗪。在反应机理中,
碘在两个不同方面起着
催化剂的关键作用,例如用引发级联反应的
碘供体活化
炔烃,然后作为适当的酸源以促进
催化剂的回收。
苯并恶嗪已经被用作直接一步合成
喹唑啉3-
氧化物衍
生物的潜在底物。