1: 1) K3PO4 2) 2M aq. KOH / 1) acetone, reflux 2) EtOH 2: 12 percent / acetonitrile / 0.83 h / Irradiation View Scheme

in acetonitrile 0.833333 h; Irradiation;

titanium(IV) isopropylate; (1S,2R)-(+)-N-dimethoxyphosphinothioyl norephedrine 1.) toluene, hexane, -30 deg C, 20 min, 2.) THF, hexane, 0 deg C, 24 h; Yield given. Multistep reaction. Yields of byproduct given;