Br[C:2]1[CH:7]=[CH:6][CH:5]=[C:4]([N+:8]([O-:10])=[O:9])[CH:3]=1.C(=O)([O-])[O-].[Na+].[Na+].[C:17]([O:21][C:22]([N:24]1[CH:28]=[CH:27][CH:26]=[C:25]1B(O)O)=[O:23])([CH3:20])([CH3:19])[CH3:18]>COCCOC.C(O)C>[C:17]([O:21][C:22]([N:24]1[CH:28]=[CH:27][CH:26]=[C:25]1[C:2]1[CH:7]=[CH:6][CH:5]=[C:4]([N+:8]([O-:10])=[O:9])[CH:3]=1)=[O:23])([CH3:20])([CH3:18])[CH3:19]A solution of 1-bromo-3-nitrobenzene (1.5 g 7.42 mmol) in anhydrous 1,2-dimethoxyethane (10 ml) was treated sequentially with 1,1-bistriphenylphosphine palladium II dichloride (260 mg, 0.371 mmol), 2M aqueous sodium carbonate (7.4 ml), and 1-(t-Butoxycarbonyl)pyrrole-2-boronic acid (1.88 g, 8.91 mmol) dissolved in ethanol (10 ml). The reaction was heated under reflux for 5 hours under argon. The solvent was evaporated and the residue dissolved in dichloromethane, washed with water, brine, dried over anhydrous sodium sulfate, and evaporated in vacuo. The residue was purified by silica gel chromatography eluting with a mixture of ether/hexane (5:95) to afford the title compound (1.09 g, 51%); MS (ES+) m/e 288 [M+H]+.
読み込み中…
