1: (S)-2-amino-2,3-dimethylbutyronitrile With sulfuric acid in water T=100°C; 2: chloroformic acid ethyl ester With sodium hydroxide in water Schotten-Baumann reaction; Further stages.;

sodium hydroxide; sodium hydrogencarbonate in water; toluene

1: (S)-2-amino-2,3-dimethylbutyronitrile With sulfuric acid in water T=100°C; 2: chloroformic acid ethyl ester With sodium hydroxide in water Schotten-Baumann reaction; pH=9.8 - 10.2; 2.5 h; Further stages.;

1: (S)-2-amino-2,3-dimethylbutyronitrile With sulfuric acid in water T=100°C; 2: chloroformic acid ethyl ester With sodium hydroxide in water Schotten-Baumann reaction; Further stages.;