Sodium Carbonate → HCID 178498934, compound

Participants

Reaction Steps

To a mixture of 7-bromo-4-hydroxy-2-oxo-2H-thiochromene-3-carboxylic acid methyl ester (Example 5 e) (220 mg, 0.70 mmol) in dimethoxyethane (DME) (3.1 mL) was added pyrimidine-5-yl boronic acid (104 mg, 0.84 mmol), Pd(PPh3)4 solid (65 mg, 0.08 mmol) and then 2M aqueous Na2CO3 solution (0.86 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 (80 mL), acidified using 1 N HCl to pH 3-4 and extracted with EtOAc. The two phases were filtered through a pad of Celite® to form two clear layers. The organic layer was separated, washed with brine, dried over MgSO4, filtered and concentrated. The crude product was triturated with MeOH (10 mL) and the solid collected, rinsed with MeOH (2 mL) and dried in vacuo to provide 4-hydroxy-2-oxo-7-pyrimidin-5-yl-2H-thiochromene-3-carboxylic acid methyl ester (79 mg). MS ESI(−) m/e: 313.09 (M−1).

Provenance & Evidence