Propylamine → 2-(5-Methylthien-2-yl)-N-propylimidazo[2,1-b]-benzothiazole-3-acetamide

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Reaction Steps

1.6 g (0.005 mole) of 2-(5-methylthien-2-yl)imidazo[2,1-b]-benzothiazole-3-acetic acid are treated, at room temperature, with 0.85 g (0.005 mole) of N,N'-carbonyldiimidazole in 30 ml of anhydrous tetrahydrofuran for 3 h 30 min. A solution composed of 3 g (0.05 mole) of propylamine in 10 ml of anhydrous tetrahydrofuran is added and the mixture is stirred for 4 h at room temperature. The solvent is evaporated under reduced pressure, the compound is collected by filtration, it is washed with water up to neutral pH, then with ethanol and finally with ethyl ether and it is purified by recrystallization from methanol. 1.1 g of a light yellow solid are obtained. Melting point: 204°-206° C.

Provenance & Evidence