Synthetic applications of functionalized phosphoranylideneamino-1,4-benzoquinones: Preparation of oxazolo[5,4-b]phenoxazine, 4H-[3,1]benzoxazino-5,8-quinone and benzoxazole derivatives

Article abstract of DOI:10.1016/0040-4020(96)00290-6

The aza-Wittig reaction of the triphenylphosphoranylideneamino-1,4-benzoquinone 1 with aryl isocyanates and aroyl chlorides allows the preparation of oxazolo[5,4-b]phenoxazine and benzoxazole derivatives. The same reaction using 7 as iminophosphoranoquinone provides substituted benzoxazoles and the previously unreported 4H-[3,1]benzoxazino-5,8-quinones.