Tetrahydrofuran → Hydroxide

Participants

Reaction Steps

To a mixture of 0.150 g (0.28 mmole) of 4-(3-chloro-phenyl)-2-(5-{[methyl-(3-morpholin-4-yl-propyl)-amino]-methyl}-2-nitro-phenylamino)-thiazole-5-carboxylic acid amide (VI.50a), 20 mL of tetrahydrofuran, and 20 mL of saturated ammonium chloride solution was added 0.089 g (1.38 mg-atom) of zinc powder. After 5 minutes the mixture was filtered and the filtrate partitioned between 50 mL of saturated ammonium chloride and 50 mL of tetrahydrofuran. The tetrahydrofuran layer was dried over anhydrous sodium sulfate, filtered and concentrated under reduced pressure. The residue was stirred for 3 hours with 30 mL of acetic acid and 0.178 g (1.2 mmole) of triethyl orthoformate. The mixture was concentrated under reduced pressure, diluted with 100 mL of dichloromethane and washed with saturated sodium bicarbonate solution, then brine, dried over anhydrous sodium sulfate and concentrated under reduced pressure. The residue was purified by silica gel chromatography, eluting with dichloromethane-methanol-ammonium:hydroxide (92:8:1) to give 0.075 g of 4-(3-chloro-phenyl)-2-(6-{[methyl-(3-morpholin-4-yl-propyl)-amino]-methyl}-benzoimidazol-1-yl)-thiazole-5-carboxylic acid amide (I.50) as a light pink solid. MH+/Z=525.

Provenance & Evidence