1: ethyl (S)-3-acetoxy-3-phenylpropanoate With lithium diisopropyl amide in di-isopropyl ether 2: benzaldehyde T=-78°C; 0.5 h; 3: With 4-chlorophenyl acetate; Pseudomonas cepacia lipase (PS-C type II from Amano); ruthenium Enzymatic reaction; Further stages.;