1,2-Dimethoxyethane → 4-(2,2-dimethyl-4-oxo-1,2,3,4-tetrahydrothieno[3,2-d]pyrimidin-6-yl)-1-{[2-(trimethylsilyl)ethoxy]methyl}-1H-pyrazole-5-carbaldehyde

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Reaction Steps

A mixture of 6-bromo-2,2-dimethyl-2,3-dihydrothieno[3,2-d]pyrimidin-4(1H)-one (0.444 g, 1.70 mmol), (5-formyl-1-{[2-(trimethylsilyl)ethoxy]methyl}-1H-pyrazol-4-yl)boronic acid (0.554 g, 2.05 mmol), cesium carbonate (2.77 g, 8.50 mmol), 1,2-dimethoxyethane (15 mL) and water (4 mL) was purged with argon. Then, 1,1′-bis(diphenylphosphino)ferrocenepalladium (II) dichloride dichloromethane adduct (0.139 g, 0.17 mmol) was added, and the mixture was purged with argon again. The mixture was refluxed for 2 h. Then, the mixture was poured into water (100 mL) and EtOAc (100 mL). The insoluble materials were filtered off, and the organic layer was collected from the filtrate. This organic layer was washed with brine, dried over MgSO4 and concentrated under reduced pressure. The residual oil was purified by column chromatography (Purif, silica gel, 95:5 hexane/EtOAc to EtOAc) to afford the title compound (374 mg, 54%) as a yellow solid:

Provenance & Evidence