catalyst: PPh3; Cs2CO3 in tetrahydrofuran; methanol ligand and B comps. (1:1.2 molar ratio) at 70°C for 6-15 h; NMR;

1: triphenylbenzyl-phosphonium bromide in tetrahydrofuran; hexane T=-78°C; 1 h; Inert atmosphere; 2: N-pyridin-2-ylmethylene-toluene-4-sulfonamide in tetrahydrofuran; hexane T=-78 - 20°C; 12 h; Inert atmosphere; optical yield given as percent destereoselective reaction;