1.1: dichloromethane / 2 h / 25 °C 2.1: 1-hydroxy-7-aza-benzotriazole; N-ethyl-N,N-diisopropylamine; HATU / dichloromethane / 24 h / 25 °C 3.1: Grubb's 2nd generation catalyst / toluene / 4 h / 110 °C 3.2: 20 °C View Scheme

Stage #1: With  lithium hydroxide in  tetrahydrofuran; water T=0°C; 3 h; Stage #2: With  potassium hydrogensulfate in  tetrahydrofuran; water pH=3;   

Multi-step reaction with 2 steps 1.1: triethylamine; 2,4,6-trichlorobenzoyl chloride / tetrahydrofuran / 1 h / 0 °C1.2: 10 h / 25 °C2.1: water; lithium hydroxide hydrate / tetrahydrofuran / 3 h / 0 °C2.2: pH 3