NaO(t-Bu); (R,S)-Taniaphos; CuCl in methanol; tetrahydrofuran CuCl (2 mol), NaO(t-Bu) (3 mol percent), (R,S)-Taniaphos (4 mmol percent), MeOH (2 equiv.), room temp., 24 h;

potassium acetate; copper(l) chloride in N,N-dimethyl-formamide (N2); addn. of DMF to CuCl, stirring for 1 h at room temp., addn. of boron compd., CH3COOK and ketone, stirring at room temp. for 16 h, addn. ofwater; extn. with benzene, washing with water, drying with MgSO4, column chromy(SiO2);