Ammonium formate → 7-Hydroxy-4-(indol-5-ylamino)-6-methoxyquinazoline

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Reaction Steps

A solution of give 7-benzyloxy-4-(indol-5-ylamino)-6-methoxyquinazoline hydrochloride (10 g, 23.1 mmol) in methanol (300 ml) and DMF (100 ml) containing ammonium formate (22 gr, 347 mmol) and 10% palladium on charcoal (1 g) was stirred overnight at ambient temperature. The solution was filtered over celite and washed with DMF followed by methanol. The filtrate was evaporated. The residue was dissolved in aqueous ammonia 2 mM (300 ml) and stirred for 15 minutes. The solid was filtered, washed with water followed by ethyl acetate and ether and dried under vacuum at 50° C. for 2 days. The solid was purified by column chromatography eluting with methanol/methylene chloride (1/9). The volatiles were removed under vacuum and the solid was left under vacuum at 70° C. for 2 days to give 7-hydroxy-4-(indol-5-ylamino)-6-methoxyquinazoline (6.8 g, 97%)

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