hydrogenchloride in 1,4-dioxane 1) 60-70 deg C, 6 h, 2) 60-90 deg C, 8 h;

1: 11-aminoundecanoic acid hydrochloride salt With chloro-trimethyl-silane; triethylamine in dichloromethane 4 h; Heating; 2: betulonic acid chloride With triethylamine in dichloromethane T=20°C; 24 h;