1: N-bromosuccinimide, benzoyl peroxide / CCl4 / Heating 2: 1.) hexamethylenetetramine / 1.) CHCl3, 3 h, reflux, 2.) acetic acid, water, 4 h, reflux View Scheme

1: With oxalyl dichloride; dimethyl sulfoxide in dichloromethane T=-78 - -40°C; 1 h; 2: With triethylamine in dichloromethane T=-40 - 20°C;

1.1: borane-THF / tetrahydrofuran / 0 °C / Reflux 1.2: Cooling with ice 2.1: oxalyl dichloride; dimethyl sulfoxide / dichloromethane / 1 h / -78 - -40 °C 2.2: -40 - 20 °C View Scheme

1,3,5,7-tetra-azatricyclo[5.1.1.13,5]decane 1.) CHCl3, 3 h, reflux, 2.) acetic acid, water, 4 h, reflux; Yield given. Multistep reaction;