Abstract
| - A new method for the synthesis of tricyclic benzobisoxazines,based upon silica gel-catalyzed formation of two 3,1-oxazinerings, is reported. The reversibility of the condensationreaction, forming an oxazine ring, allows for implementationof silica gel catalyzed ketone exchange in benzobisoxazine,thus enabling access to nonsymmetric derivatives of benzobisoxazines.
|