[C:1]([O:5][C:6](=[O:15])[NH:7][C:8]1[S:12][C:11]([Cl:13])=[N:10][C:9]=1[Cl:14])([CH3:4])([CH3:3])[CH3:2].C(N(CC)CC)C.[CH3:23][S:24][CH2:25][CH2:26][C:27](Cl)=[O:28]>ClC(Cl)C.CN(C1C=CN=CC=1)C>[C:1]([O:5][C:6](=[O:15])[N:7]([C:8]1[S:12][C:11]([Cl:13])=[N:10][C:9]=1[Cl:14])[C:27](=[O:28])[CH2:26][CH2:25][S:24][CH3:23])([CH3:4])([CH3:2])[CH3:3]To a solution of (2,4-dichloro-thiazol-5-yl)-carbamic acid tert-butyl ester (1.0 g, 3.7 mmol) in dichloroethane (20 mL) stirring at room temperature was added triethylamine (935 mg, 9.25 mmol), followed by dropwise addition of methylsulfanyl-propionyl chloride (776 mg, 5.6 mmol) and the mixture was stirred for 5 min before DMAP (45 mg, 0.37 mmol) was added. The mixture was stirred at 75° C. for 4 h. The reaction mixture was cooled, quenched with H2O (30 mL). The organic layer was separated and the aqueous layer extracted with dichloromethane (20 mL). The combined organic layer was dried over Na2SO4 and purified by silica gel chromatography (0 to 100% ethyl acetate/hexanes) to give product as a colorless oil (1.11 g, 81%): 1H NMR (300 MHz, CDCl3) δ 3.32 (t, J=7.3 Hz, 2H), 2.83 (t, J=7.3 Hz, 2H), 2.16 (s, 3H), 1.46 (s, 9H); ESIMS m/z 371.2 (M+1).
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