[NH:1]1[CH:5]=[CH:4][CH:3]=[C:2]1[C:6]([O:8][CH3:9])=[O:7].[H-].[Na+].Br[CH2:13][C:14]([C:16]1[CH:21]=[CH:20][C:19]([OH:22])=[CH:18][CH:17]=1)=[O:15].[NH4+].[Cl-]>CN(C=O)C>[OH:22][C:19]1[CH:20]=[CH:21][C:16]([C:14](=[O:15])[CH2:13][N:1]2[CH:5]=[CH:4][CH:3]=[C:2]2[C:6]([O:8][CH3:9])=[O:7])=[CH:17][CH:18]=1To a chilled solution of methyl 1H-pyrrole-2-carboxylate (1.0 g, 8.0 mmol) in dry DMF (20 mL) was added sodium hydride (60% in mineral oil, 320 mg, 8.0 mmol) portionwise. The mixture was stirred at 0° C. for 1 hour before a solution of 2-bromo-1-(4-hydroxyphenyl)ethanone (780 mg, 3.6 mmol) in DMF (5 mL) was added. The resulting yellow solution was allowed to warm to room temperature. After 2.5 hours the reaction was complete (monitored by LCMS). A saturated aqueous solution of NH4Cl (40 mL) was added and the mixture was extracted with EtOAc (1×20 mL). The organic layer was concentrated in vacuo to yield a residue that was purified by flash chromatography using the (Biotage SP4, 40 g cartridge, 0 to 100% EtOAc gradient in hexane) to give methyl 1-[2-(4-hydroxyphenyl)-2-oxoethyl]-1H-pyrrole-2-carboxylate as a white solid (810 mg, yield 87%).
読み込み中…
