Water → 6-(Imidazo[2,1-b]thiazol-5-ylmethyl)-2-(methylthio)benzo[d]thiazole

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Reaction Steps

A stirred mixture of 2-chloro-3-(2-(methylthio)benzo[d]thiazol-6-yl)propanal from Step 4 of Example 117 (500 mg, 1.84 mmol) and thiazol-2-amine (370 mg, 3.68 mmol) in 1-butanol (22 mL) was heated at reflux overnight. The mixture was cooled to rt and water (120 mL) was added. The mixture was extracted with EtOAc (60 mL×3). The combined organic layers were washed with brine, 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-(methylthio)benzo[d]thiazole as a yellow solid (350 mg, 60%). 1H NMR (300 MHz, CDCl3) δ 7.80 (d, J=8.4 Hz, 1H), 7.55 (d, J=1.2 Hz, 1H), 7.29 (d, J=1.8 Hz, 1H), 7.16 (d, J=0.9 Hz, 1H), 6.99 (d, J=4.5 Hz, 1H), 6.71 (dd, J=0.9 Hz, J=4.5 Hz, 1H), 4.24 (s, 2H), 2.78 (s, 3H). LCMS (ESI) m/z 318 (M+H)+.

Provenance & Evidence