2,5-Dihydrofuran → HCID 71087871, compound

Participants

Reaction Conditions

Reaction Steps

A mixture of 5-bromo-pyridine-2-carboxylic acid methyl ester (CAN 29682-15-3, 15 g, 69 mmol), 2,5-dihydrofuran (CAN 36620-92-5, 48 g, 0.69 mol), palladium diacetate (CAN 3375-31-3, 0.8 g, 3.6 mmol), sodium acetate (6.9 g, 84 mmol) and tri-tert-butylphosphine (CAN 13716-12-6, 10%, 14 g, 7 mmol) in DMF (50 ml) was stirred at 120° C. in a sealed tube for 2.5 h. After cooling to room temperature, the reaction mixture was concentrated. The crude product was purified by column chromatography (silica gel, 200 g, eluting with 30% ethyl acetate in petroleum ether) to give 5-(2,5-dihydrofuran-3-yl)-pyridine-2-carboxylic acid methyl ester (a1) and 5-(4,5-dihydrofuran-2-yl)-pyridine-2-carboxylic acid methyl ester (a2) (mixture, a1/a2=1/0.94 at UV 254 nm, 10.8 g, 76%) as colorless oil; MS (EI): m/e=206.1 [M+H]+.

Provenance & Evidence