S(Cl)(Cl)=O.[CH:5]1([S:8][C:9]2[CH:17]=[CH:16][C:12]([C:13](O)=[O:14])=[CH:11][CH:10]=2)[CH2:7][CH2:6]1.[NH3:18].O>ClCCl>[CH:5]1([S:8][C:9]2[CH:17]=[CH:16][C:12]([C:13]([NH2:18])=[O:14])=[CH:11][CH:10]=2)[CH2:7][CH2:6]1Thionyl chloride (340 μL, 4.7 mmol) is added to a solution of 4-cyclopropylsulfanyl-benzoic acid (prepared as described in WO07003960, 190 mg, 0.98 mmol) in dichloromethane (1.9 mL), and the mixture is heated at reflux for 30 min. All volatiles are removed under reduced pressure, and the residue is dissolved in chloroform (1.9 mL). Concentrated aqueous ammonia (28%, 770 μL, 9.8 mmol) is added and the mixture is stirred at room temperature for 1 h. Water is added and the phases are separated. The organic layer is concentrated under reduced pressure. Yield: 137 mg (72% of theory); ESI mass spectrum: [M+H]+=194; r.t. HPLC: 0.45 min (X011_S03).
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