Sodium hydride → Ethyl 6-{(e)-2-[2-(cyclopropylmethoxy)-3-methoxyphenyl]vinyl}imidazo[2,1-b][1,3]thiazole-5-carboxylate

Participants

Reaction Steps

To a stirred suspension of Step 3 intermediate (2.0 g, 3.626 mmol) was added NaH (0.160 g, 3.989 mmol) in anhydrous DMSO (10 mL) and stirred for 30 min. A solution of 2-(cyclopropylmethoxy)-3-methoxybenzaldehyde (0.82 g, 3.989 mmol) in anhydrous DMSO (10 mL) was added drop wise to this solution at room temperature and stirred for 2 h. The reaction mixture was diluted with ethyl acetate (200 mL), washed with water (2×50 mL), brine and dried (Na2SO4) to yield a crude solid which was purified by column chromatography using 5% ethyl acetate in petroleum ether to afford 0.776 g of the product as an off-white solid; 1H NMR (300 MHz, DMSO-d6) δ 0.26-0.28 (m, 2H), 0.50-0.53 (m, 2H), 1.17-1.23 (m, 1H), 1.39 (t, J=7.5 Hz, 3H), 3.75 (d, J=7.2 Hz, 2H), 3.79 (s, 3H), 4.37 (q, J=6.9 Hz, 2H), 6.95-6.99 (m, 2H), 7.08 (t, J=7.8 Hz, 1H), 7.18-7.22 (m, 1H), 7.43 (d, J=4.5 Hz, 1H), 7.69 (d, J=16.2 Hz, 1H), 7.92 (d, J=16.5 Hz, 1H), 8.10 (d, J=4.2 Hz, 1H); ESI-MS (m/z) 399.20 (MH)+.

Provenance & Evidence