Br[C:2]1[S:10][C:9]2[C:8](=[O:11])[NH:7][C:6]([CH3:13])([CH3:12])[NH:5][C:4]=2[CH:3]=1.[CH3:14][C:15]1[C:19](B2OC(C)(C)C(C)(C)O2)=[CH:18][N:17](C(OC(C)(C)C)=O)[N:16]=1.C(=O)([O-])[O-].[Cs+].[Cs+].C(=O)([O-])[O-].[Na+].[Na+].[OH-].[Na+]>CCOC(C)=O.O.COCCOC>[CH3:12][C:6]1([CH3:13])[NH:5][C:4]2[CH:3]=[C:2]([C:19]3[CH:18]=[N:17][NH:16][C:15]=3[CH3:14])[S:10][C:9]=2[C:8](=[O:11])[NH:7]1A mixture of 6-bromo-2,2-dimethyl-2,3-dihydrothieno[3,2-d]pyrimidin-4(1H)-one (522 mg, 2 mmol), tert-butyl 3-methyl-4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-1H-pyrazole-1-carboxylate (1.85 g, 6.00 mmol), cesium carbonate (3.26 g, 10.0 mmol), 1,2-dimethoxyethane (20 mL) and water (5 mL) was purged with argon. Then, 1,1′-bis(diphenylphosphino) ferrocenepalladium (II) dichloride dichloromethane adduct (163 mg, 0.20 mmol) was added, and the mixture was purged with argon again. The mixture was refluxed for 2 h. Then, sodium carbonate (636 mg, 6.00 mmol) was added. After 30 min, 8 M NaOH (1.5 mL, 12 mmol) was added. After 3 h, the mixture was cooled to room temperature, and poured into water (100 mL) and EtOAc (200 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, filtered and concentrated under reduced pressure. The residual oil was purified by column chromatography (Purif, silica gel, 95:5 hexane/EtOAc to EtOAc), then triturated with EtOAc, and the precipitate was collected by filtration to afford the title compound (312 mg, 60%) as a pale yellow solid:
読み込み中…
