[Cl:1][C:2]1[N:3]=[C:4]([C:10]2[CH:11]=[N:12][CH:13]=[CH:14][CH:15]=2)[S:5][C:6]=1[NH:7][CH2:8][CH3:9].[CH3:16][CH:17]([CH2:21][S:22][CH3:23])[C:18](O)=[O:19].C(N(CC)CC)C.Cl.CN(C)CCCN=C=NCC>ClC(Cl)C>[Cl:1][C:2]1[N:3]=[C:4]([C:10]2[CH:11]=[N:12][CH:13]=[CH:14][CH:15]=2)[S:5][C:6]=1[N:7]([CH2:8][CH3:9])[C:18](=[O:19])[CH:17]([CH3:16])[CH2:21][S:22][CH3:23]To a solution of (4-chloro-2-pyridin-3-yl-thiazol-5-yl)-ethylamine (800 mg, 3.33 mmol) in dichloroethane (30 mL) was added 2-methyl-3-methylsulfanyl-propionic acid (prepared according to literature reference J. Org. Chem. 1996, 51, 1026-1029) (894 mg, 6.66 mmol) and N,N-dimethylaminopyridine (814 mg, 6.66 mmol) followed by triethylamine (0.2 mL, 1.44 mmol). To this was added 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide hydrochloride (1.92 g, 9.99 mmol). The reaction mixture was stirred at ambient temperature for 16 h. The reaction mixture was concentrated and the crude product was purified by silica gel chromatography (0 to 100% ethyl acetate/hexanes) to afford a beige solid (715 mg, 60%): mp 79-81° C.; 1H NMR (300 MHz, CDCl3) δ 9.11 (d, J=1.7 Hz, 1H), 8.71 (d, J=4.8 Hz, 1H), 8.27-8.13 (m, 1H), 7.42 (dd, J=8.0, 4.9 Hz, 1H), 3.90 (bs, 1H), 3.69 (bs, 1H), 2.80 (bs, 2H), 2.47 (bs, 1H), 2.02 (s, 3H), 1.21 (q, J=7.3 Hz, 6H); ESIMS m/z 356 (M+1).
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