1: triphenylbenzyl-phosphonium bromide in tetrahydrofuran; hexane T=-78°C; 1 h; Inert atmosphere; 2: C19H15NO2S in tetrahydrofuran; hexane T=-78 - 20°C; 12 h; Inert atmosphere; optical yield given as percent destereoselective reaction;

1: triphenylbenzyl-phosphonium bromide in tetrahydrofuran; hexane T=-78°C; 1 h; Inert atmosphere; 2: C19H15NO2S in tetrahydrofuran; hexane T=-78 - 20°C; 12 h; Inert atmosphere; optical yield given as percent destereoselective reaction;