1: With BH3*SMe2 in tetrahydrofuran T=0 - 23°C; 1.95 h; 2: With sodium hydroxide; dihydrogen peroxide in tetrahydrofuran; water T=23°C; 2 h; Heating / reflux;

in tetrahydrofuran T=0 - 20°C; 14.5 h;

in methanol T=0°C; 0.25 h;