1: With 2,2,2-trimethylacetic acid; (S)-(+)-1-tert-butyldiphenylsilyloxy-3-(3'-methyl-3'H-imidazol-4'-yl)-2-(2'',4'',6''-triisopropylbenzenesulfonylamino)propane in tetrachloromethane T=20°C; 2 h; Inert atmosphere; 2: With hydrogenchloride; water in tetrachloromethane Inert atmosphere; optical yield given as percent eeenantioselective reaction;
