Efficient Synthesis of Tricyclic Benzobisoxazines by Silica Gel Catalysis
作者:Gaëlle Spagnol、Andrzej Rajca、Suchada Rajca
DOI:10.1021/jo062670e
日期:2007.3.1
method for the synthesis of tricyclic benzobisoxazines, based upon silicagel-catalyzed formation of two 3,1-oxazine rings, is reported. The reversibility of the condensation reaction, forming an oxazine ring, allows for implementation of silica gel catalyzed ketone exchange in benzobisoxazine, thus enabling access to nonsymmetric derivatives of benzobisoxazines.