1: (4-methoxyphenyl)methanol With n-butyllithium in tetrahydrofuran; hexane T=-78°C; 0.5 h; Inert atmosphere; 2: (S)-1-benzyl-2-[(E)-2-butenoyl]-5-phenyl-pyrazolidin-3-one in tetrahydrofuran; hexane T=-78 - 20°C; Inert atmosphere; 3: With water; ammonium chloride in tetrahydrofuran; hexane T=20°C; Inert atmosphere; optical yield given as percent ee;