n-butyllithium in tetrahydrofuran; hexane 1.) -78 deg C, 2 h, 2.) -78 to -50 deg C, 30 min;

1: (-)-Ipc2BOMe; 2-propenylmagnesium bromide in diethyl ether T=0°C; 1 h; Inert atmosphere; 2: 4-azidobutyraldehyde in diethyl ether T=-78°C; Brown allylboration; 3 h; Inert atmosphere; 3: With dihydrogen peroxide; sodium hydroxide in methanol; diethyl ether; water optical yield given as percent eeenantioselective reaction;

1: in diethyl ether T=-78°C; 3 h; Inert atmosphere; 2: With dihydrogen peroxide; sodium hydroxide in methanol; diethyl ether; water T=-78 - 23°C; Inert atmosphere;

sodium chlorite; sodium dihydrogen phosphate dihydrate in 2-methyl-but-2-ene; water; tert-butyl alcohol T=20°C; 10 h;

With  dimethylsulfide; ozone  1.) CH2Cl2, -78 deg C, 2.) room temp., 24 h;  Yield given. Multistep reaction;