Ethanol → 3-(Benzo[b]furan-3-yl)-5,6-dihydroimidazo[2,1-b]thiazole monohydrobromide

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Reaction Steps

A mixture of 3-(2-bromoacetyl)benzo[b]furan (36.9 g), 2-imidazolidinethione (15.75 g), ethanol (600 ml) and acetic acid (400 ml) was heated under reflux for 21 hours then allowed to cool to ambient temperature. The resulting solid was collected by filtration, washed with ether (500 ml), and dissolved in hot methanol (500 ml). Charcoal (2 g) was added and the hot mixture was stirred for a few minutes, then filtered and allowed to cool to ambient temperature. The resulting solid was collected by filtration, ground to a fine powder, and dried in vacuo at 80° C. to give 3-(benzo[b]furan-3-yl)-5,6-dihydroimidazo[2,1-b]thiazole monohydrobromide 0.7 hydrate as an off-white solid (28.1 g), m.p. 251°-254.50C.

Provenance & Evidence