Expedient synthesis of novel 1,4-benzoxazine and butenolide derivatives

A highly efficient and rapid method for the synthesis of 2-hydroxy-1,4-benzoxazine and butenolide derivatives has been developed. The key step in this protocol involves the reduction of benzoxazinone derivatives. Further reaction of 2-hydroxy-1,4-benzoxazine with secondary amines and sodium methoxide affords the corresponding 2-amino-1,4-benzoxazines and butenolide derivatives, respectively, in good yields.