Efficient stereoselective synthesis of benzoxazines via copper-catalyzed three-component coupling reactions
作者:Xiaobing Xu、Linfeng Liang、Jun Liu、Jingyu Yang、Lugen Mai、Yanzhong Li
DOI:10.1016/j.tetlet.2008.10.080
日期:2009.1
A convenient one-potsynthesis of 1,4-benzoxazines viathree-componentcoupling and subsequent O-cyclization is reported. The present reaction provides an efficient protocol to functionalized 1,4-benzoxazine derivatives in good to high yields from aldehydes, amines and alkynes. Furthermore, the O-annulation process is completely regio- and stereoselective, only the six-membered rings and its Z-isomers