1-Butanol → 4-[2-(cyclopropylmethoxy)-5-(difluoromethyl)phenyl]-6-methyl-5H-pyrrolo[3,2-d]pyrimidine-7-carboxylic acid

Participants

Reaction Conditions

Reaction Steps

Ethyl 4-[2-(cyclopropylmethoxy)-5-(difluoromethyl)phenyl]-6-methyl-5H-pyrrolo[3,2-d]pyrimidine-7-carboxylate (example D.a19; 52.73 g; 131.4 mmol) is dissolved in tert. BuOH (500.0 mL) and water (5.0 mL). After addition of commercially available KOtBu (73.70 g; 656.8 mmol) the reaction mixture is stirred at 100° C. over night and cooled to ambient temperature. Water (1500 mL) is added and pH is adjusted to 6.0 by careful addition of 2M aqueous citric acid. The precipitated product is filtered washed with several portions of water and dried under reduced pressure to yield 45.3 g of the title compound as off-white solid.

Provenance & Evidence