Action de l'acide paranitroperbenzoique sur le tetrafluoroborate de n-methyl-3,4-dihydroisoquinolinium. Formation d'un sel d'oxaziridinium.

Resume Peracidic oxygenation of an iminium salt 4 derived from N-methyl-tetrahydro-1,2,3,4-isoquinolin- leads to an oxaziridinium salt 3 in the presence of a substoichiometric amount of sodium hydrogen carbonate. In stoichiometric amounts of base, the oxaziridinium salt 3 gives a mixture of N-methyl-isoquinolinium 5 , the opened structure 6 , and starting material 4 . 6 .