J. Cossy et M. Guha, INTRAMOLECULAR QUENCHING OF IMINIUM IONS GENERATED BY PHOTOOXIDATION OF AMINOALCOHOLS WITH KETONES - A NEW SYNTHESIS OF OXAZINES AND OXAZOLES, Tetrahedron letters, 35(11), 1994, pp. 1715-1718
The irradiation of tertiary amines in the presence of ketones leads to
a regioselective formation of iminium salts which then react to affor
d the corresponding oxazines or oxazoles.