1,2-Dimethoxyethane → 1,2,2-trimethyl-6-quinolin-4-yl-2,3-dihydrothieno[3,2-d]pyrimidin-4(1H)-one

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Reaction Steps

A mixture of 6-bromo-1,2,2-trimethyl-2,3-dihydrothieno[3,2-d]pyrimidin-4(1H)-one (138 mg, 0.50 mmol), quinolin-4-ylboronic acid (173 mg, 1.00 mmol), cesium carbonate (489 mg, 1.50 mmol), 1,2-dimethoxyethane (5 mL) and water (1 mL) was purged with argon. Then, 1,1′-bis(diphenylphosphino) ferrocenepalladium (II) dichloride dichloromethane adduct (40.8 mg, 0.050 mmol) was added, and the mixture was purged with argon again. This mixture was refluxed for 18 h. Then, the mixture was poured into saturated aqueous NaHCO3 (100 mL) and extracted with EtOAc (100 mL), and the extract was washed with brine, dried over MgSO4, filtered and concentrated under reduced pressure. This residue was purified by column chromatography (Purif, silica gel, 95:5 hexane/EtOAc to EtOAc then to 90:10 EtOAc/MeOH). The obtained yellow solid (62 mg) was triturated with EtOAc/hexane, and the precipitate was collected by filtration to afford the title compound (47.2 mg, 29%) as a pale yellow solid:

Provenance & Evidence