| 88.3% |
|
(Setting-Up and Reaction) To a 200 mL four-necked round-bottomed flask, a three-way stopcock, a Teflon-coated magnetic stirring bar, a 20 mL dropping funnel, and a thermometer were attached, and the inside was purged with nitrogen. To this flask, <strong>[902518-11-0]N-(2-bromophenyl)carbazole</strong> (7) (8.8 g, 27.3 mmol, 1.0 eq.) obtained in the first step and anhydrous tetrahydrofuran (hereinafter, abbreviated as THF) (54.6 mL) were sequentially added, and the obtained reactant solution was cooled to -70C by use of a dry ice/acetone bath. Subsequently, a n-butyllithium (hereinafter, abbreviated as n-BuLi)/n-hexane solution (1.60 mol/L, 17. 9 mL, 28. 6 mmol, 1.05 eq.) was placed in the dropping funnel, and added dropwise over 15 minutes, while the reactant solution was being stirred, and the inside temperature was being kept at -50C or below. Then, the dropping funnel was rinsed with anhydrous n-hexane (1 mL) . The obtained cream-colored suspension was stirred at -70C for 1 hour. Then, an anhydrous THF (14 mL) solution of chlorodicyclohexylphosphine (hereinafter, abbreviated as Cy2PCl) (7.0 g, 30.1 mmol, 1.1 eq.) was placed in the dropping funnel, and added dropwise over 15 minutes, while the suspension was being stirred, and the inside temperature was being kept at -50 C or below (the suspension was dissolved rapidly). After completion of the dropwise addition, the dry ice/acetone bath was taken out, and the temperature of the reaction solution was raised to room temperature over 30 minutes, followed by stirring for further 30 minutes. (Post Treatment and Purification) After the reaction solution had been concentrated under reduced pressure, toluene and an aqueous solution of sodium hydrogen carbonate (2.3 g, approximately 1 eq.) were added to the residue. The mixture was transferred to a separating funnel, shaken and allowed to stand, and the layers were separated (Aqueous Layer 1: pH=9). Then, the organic layer was further washed with water (Aqueous Layer 2: pH=7). The solvent was distilled off from the organic layer under reduced pressure, and toluene and silica gel (0.7 g) were added to the obtained light brown residue. The mixture was stirred at room temperature for 10 minutes and filtered by use of diatomaceous earth, and the residue was washed with toluene. The filtrate was concentrated, until crystals were precipitated. Then, methanol was added, and the obtained white suspension was filtered. The product obtained by the filtration was washed with methanol, and then dried under reduced pressure to give 10.6 g of title compound (2-1) as a colorless powder. Isolated Yield: 88.3%. 1H NMR (300 MHz, CDCl3): delta=8.12 (d, J=7.5 Hz, 2H), 7.76 (dt, J=1.5, 4.8 Hz, 1H), 7.57-7.47 (m, 2H), 7.38-7.28 (m, 3H), 7.23 (dt, J=0.9, 6.9 Hz, 2H), 7.02 (d, J=8.1 Hz, 2H), 1.85-1.38 (m, 12H), 1.22-0.90 (m, 10H). 31P NMR (121 MHz, CDCl3): delta=-14.5. |
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