1: With chloroformic acid ethyl ester; triethylamine in chloroform T=0 - 21°C; 2.33333 h; 2: With sodium tetrahydroborate; water T=20 - 35°C; 2.1 h; 3: With hydrogenchloride in water pH=4;

sodium tetrahydroborate; triethylamine in tetrahydrofuran; chloroform; water