triethylamine in tetrahydrofuran T=20°C; 2 h;

1: methanesulfonic acid 1-benzhydryl-azetidine-3-ylmethyl ester With hydrogenchloride; hydrogen; palladium hydroxide on carbon in ethanol; water P=2068.65 Torr; 3 h; 2: di-tert-butyl dicarbonate With triethylamine in dichloromethane T=0 - 20°C; 2 h;