Reactions of 4-oxo-1,3-benzoxazinium perchlorates with sodium borohydride
摘要:
Reduction of 4-oxo-1,3-benzoxazinium perchlorates with sodium borohydride depending on the structure of starting salt and the reaction conditions leads to different products. 2-Alkyl- and 2-phenylsubstituted salts react with sodium borohydride to give 2,3-dihydro-4-oxo-1,3-benzoxazines. 2-Arylvinyl- and 2-heterylvinyl-substituted perchlorates either form 4-oxo-1,3-benzoxazines or undergo hydrogenation to aryl- or heterylethyldihydrobenzoxazinones.