1: (2S,5R,3E)-2-(Benzyloxymethoxy)-6-methyl-5-(benzyloxycarbonylamino)hept-3-ene With ozone in methanol T=-78°C; Oxidation; Ozonolysis; 0.333333 h; 2: With dimethylsulfide in methanol T=-78 - 20°C; Reduction; 1 h; 3: methanol With water; bromine; sodium hydrogencarbonate T=20°C; Oxidation; Esterification; Title compound not separated from byproducts;

1: (2S,5R,3E)-2-(Benzyloxymethoxy)-6-methyl-5-(benzyloxycarbonylamino)hept-3-ene With ozone in methanol T=-78°C; Oxidation; Ozonolysis; 0.333333 h; 2: With dimethylsulfide in methanol T=-78 - 20°C; Reduction; 1 h; 3: methanol With water; bromine; sodium hydrogencarbonate T=20°C; Oxidation; Esterification; Title compound not separated from byproducts;