trifluoroacetic acid in dichloromethane 0.5 h; Yield given;

1: 2,4,6-triisopropylbenzenesulfonyl chloride / pyridine / 4 h / Ambient temperature 2: trifluoroacetic acid / CH2Cl2 / 0.5 h View Scheme

1: 98 percent / triethylamine (TEA) / tetrahydrofuran / 16 h / Ambient temperature 2: CaCl2, Tris-HCl buffer / diethyl ether; methanol / 10 h / 37 °C / phospholipase A2 View Scheme

1,8-diazabicyclo[5.4.0]undec-7-ene in toluene 18 h; Ambient temperature;