trifluorormethanesulfonic acid; nitric acid in dichloromethane T=-78 - 0°C; 2.25 h;

1: (+/-)-2,2,2-trifluoro-1-(6-nitro-1,2,3,4-tetrahydro-1,4-epiazano-naphthalen-9-yl)-ethanone With lithium hydroxide; water in tetrahydrofuran T=25°C; 1 h; 2: di-tert-butyl dicarbonate in tetrahydrofuran; water T=25°C; 2 h;