in dimethyl sulfoxide T=100°C; 12 h; Inert atmosphere; optical yield given as percent destereoselective reaction;

1: 72 percent / benzene / 18 h / Heating 2: 1) triethyloxonium fluoroborate 2) sodium borohydride / 1) methylene dichloride, 25 deg C, 20 hr. 2) ethanol, 0 deg C, 3 hr. 3: benzene / 2 h / Heating View Scheme