1: chloroformic acid ethyl ester With 1-hydroxy-pyrrolidine-2,5-dione; N-ethyl-N,N-diisopropylamine in dichloromethane T=0 - 20°C; 3 h; Inert atmosphere; 2: 2-amino-2-methyl-propan-1-ol in dichloromethane T=20°C; Cooling with ice;

T=0°C; Irradiation;