Methane → 3-pyridyl-1H,3H-pyrrolo[1,2-c]thiazole-7-carboxamide

Participants

Reaction Conditions

Reaction Steps

7-Chloroformyl-3-(3-pyridyl)-1H,3H-pyrrolo[1,2-c]thiazole hydrochloride (10 g) is added, at a temperature between 61° and 65° C., to a solution of 3-(2-methoxyphenoxy)aniline (7.1 g) and triethylamine (6.7 g) in dioxane (160 cc) which is heated to a temperature in the vicinity of 60° C., in the course of 30 minutes. The suspension obtained is heated, with stirring, at a temperature in the vicinity of 100° C. for 6 hours and then stirred at a temperature in the vicinity of 20° C. for 16 hours. The solvent is evaporated off under reduced pressure (20 mm Hg; 2.7 kPa) at a temperature in the vicinity of 60° C. The residue is dissolved in methylene chloride (400 cc). The solution obtained is washed with distilled water (100 cc), twice with an aqueous 1N sodium hydroxide solution (200 cc in total), and 6 times with distilled water (600 cc in total) and then dried over anhydrous magnesium sulphate, treated with decolourizing charcoal (0.5 g), filtered and concentrated to dryness under reduced pressure (20 mm Hg; 2.7 kPa) at a temperature in the vicinity of 50° C. A crude product (7.8 g) is thereby obtained, which is dissolved in boiling acetonitrile (50 cc). Decolourizing charcoal (0.5 g) is added to the solution obtained and the suspension is filtered in the heated state. The filtrate is cooled at a temperature in the vicinity of 4° C. for 1 hour. The crystals formed are separated by filtration, washed twice with acetonitrile cooled to a temperature in the vicinity of 4° C. (15 cc in total) and twice with diethyl ether (30 cc in total) and then dried under reduced pressure (20 mm Hg; 2.7 kPa) at a temperature in the vicinity of 20° C. in the presence of potassium hydroxide pellets. N-[3-(2-methoxyphenoxy)phenyl]-3-(3-pyridyl-1H,3H-pyrrolo[1,2-c]thiazole-7-carboxamide (3.9 g) in the form of white crystals, m.p. 163° C. is thereby obtained.

Provenance & Evidence