1: (3S,4S)-1-methoxy-9-methyl-1-oxo-3-(tetrahydro-2H-pyran-2-yloxy)decan-4-yl benzoate With lithium aluminium tetrahydride in diethyl ether T=20°C; 0.5 h; 2: methanesulfonyl chloride With triethylamine in diethyl ether T=0°C;

lithium aluminium tetrahydride in diethyl ether T=20°C; 0.5 h;