[S:1]1[CH:5]=[CH:4][N:3]2[C:6]([CH2:9][C:10]3[CH:20]=[CH:19][C:13]4[N:14]=[C:15]([S:17][CH3:18])[S:16][C:12]=4[CH:11]=3)=[CH:7][N:8]=[C:2]12.C1C=C(Cl)C=C(C(OO)=[O:29])C=1.[O-]S([O-])(=S)=O.[Na+].[Na+]>C(Cl)Cl>[S:1]1[CH:5]=[CH:4][N:3]2[C:6]([CH2:9][C:10]3[CH:20]=[CH:19][C:13]4[N:14]=[C:15]([S:17]([CH3:18])=[O:29])[S:16][C:12]=4[CH:11]=3)=[CH:7][N:8]=[C:2]12To a solution of 6-(imidazo[2,1-b]thiazol-5-ylmethyl)-2-(methylthio)benzo[d]thiazole (350 mg, 1.1 mmol) in DCM (20 mL) was added m-CPBA (240 mg, 1.4 mmol) at 0° C. The reaction mixture was stirred for 2 h at 0° C., then aq Na2S2O3 (20 mL) was added and the mixture was stirred for 0.5 h. The organic layer was separated and dried over Na2SO4, filtered and concentrated under reduced pressure. The residue was purified by silica gel chromatography eluting with 50:1 to 20:1 DCM/MeOH to afford 6-(imidazo[2,1-b]thiazol-5-ylmethyl)-2-(methylsulfinyl)benzo[d]thiazole as a yellow solid (310 mg, 85%). 1H NMR (300 MHz, CDCl3) δ 8.00 (d, J=8.4 Hz, 1H), 7.82 (d, J=0.9 Hz, 1H), 7.43 (dd, J=1.5, 8.4 Hz, 1H), 7.18 (s, 1H), 7.03 (d, J=4.5 Hz, 1H), 6.75 (dd, J=0.9, 4.5 Hz, 1H), 4.32 (s, 2H), 3.07 (s, 3H). LCMS (ESI) m/z 334 (M+H)+.
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