1: (-)-(S)-hydroxybutanedioic acid; acetyl chloride Reflux; 2: 4-methoxy-benzylamine With acetyl chloride in dichloromethane Reflux; 3: With acetyl chloride in dichloromethane Reflux;

acetyl chloride 1.) THF, RT, 18 h, 2.) THF, reflux, 18 h; Yield given. Multistep reaction;