1: (phenylsulfanyl)acetic acid With pyridine in tetrahydrofuran T=0°C; 0.5 h; 2: chloro-trimethyl-silane With 1,1,1,3,3,3-hexamethyl-disilazane in tetrahydrofuran T=0 - 20°C; 12 h;

in dichloromethane T=20°C; 1 h; Yield given;

lithium diisopropyl amide 1.) THF, -78 deg C, 30 min, 2.) THF, 5 min; Yield given. Multistep reaction. Yields of byproduct given;