反应详情

温度

80 °C

To a solution of 1.0 g (3.8 mmol) of 4-(t-butyldimethaylsilyoxymethyl)phenylboronic acid (Step E) in 24 mL of 1,2-dimethyoxyethane was added 4 mL of water,m 1.02 g (5.37 mmol) of barium hydroxide hexahydrate, 1.02 g (3.58 mmol) of N-(t-butoxycarbonyl)-2-bromobenzylamine (Step F) and 206 mg (0.18 mmol) of tetrakis(triphenylphosphine) palladium. The resulting mixture was heated under nitrogen at 80° C. for 2.5 hours then cooled to room temperature. The reaction mixture was diluted with 40 mL of saturated aqueous ammonium chloride. The solution was transferred to a separatory funnel and extracted with ether (3×75 mL). The combined ether extracts were washed with saturated aqueous sodium bicarbonate and saturated aqueous sodium chloride, dried over magnesium sulfate and then filtered. The solvent was removed under vacuum to give a crude product which was purified by column chromatography on silica gel eluting with hexanes/ethyl acetate (85:15) to afford 1.15 g (75%) of the product as a clear oil. FAB-MS: calculated for C25H37NO3Si 427; found 314. 1H NMR (200 MHz, CDCl3): 0.10 (s, 6H), 0.92 (s, 9H), 1.40 (s, 9H), 4.27 (d, 5 Hz, 2H), 4.60 (s, 1H), 4.78 (s, 2H), 7.18-7.45 (m, 8H).

1. temperaturethen cooled to room temperature
2. customThe solution was transferred to a separatory funnel
3. extractionextracted with ether (3×75 mL)
4. washThe combined ether extracts were washed with saturated aqueous sodium bicarbonate and saturated aqueous sodium chloride
5. dry with materialdried over magnesium sulfate
6. filtrationfiltered
7. customThe solvent was removed under vacuum
8. customto give a crude product which
9. customwas purified by column chromatography on silica gel eluting with hexanes/ethyl acetate (85:15)