Sodium Carbonate → HCID 178498932, compound

Participants

Reaction Steps

To a mixture of 7-bromo-4-hydroxy-2-oxo-2H-thiochromene-3-carboxylic acid methyl ester (Example 5e) (180 mg, 0.57 mmol) in dimethoxyethane (DME) (2.5 mL) was added 4-methoxyphenylboronic acid (104 mg, 0.69 mmol), Pd(PPh3)4 solid (66 mg, 0.06 mmol) and then 2M aqueous Na2CO3 solution (0.7 mL). The resulting mixture was purged with nitrogen gas for 1 min and heated to reflux for 2 h. After cooling the reaction mixture was diluted with water (50 mL) and acidified using 1 N HCl to pH 3-4. The precipitate was collected by filtration, rinsed with water and dissolved in CH2Cl2. The organic solution was washed with brine, dried over MgSO4, filtered and concentrated. The crude product was triturated with MeOH (5 mL) and the solid collected, rinsed with MeOH (2 mL) and dried in vacuo to provide 4-hydroxy-7-(4-methoxy-phenyl)-2-oxo-2H-thiochromene-3-carboxylic acid methyl ester (139 mg). MS ESI(+) m/e: 343.11 (M+1).

Provenance & Evidence