反应详情

To a solution of 0.554 g (1.188 mmol) of 2-borono-N-(3,4-dimethyl-5-isoxazolyl)-N-[(2-methoxyethoxy)methyl]benzenesulfonamide (prepared as described in U.S. patent application Ser. No. 08/603,975, filed Feb.20, 1996 by Murugesan et al. (Attorney Docket No. HA662d)) and 0.0578 g (0.05 mmol) of tetrakis(triphenylphosphine)-palladium(0) in 20 mL of toluene under argon, 10 mL of 2M aqueous sodium carbonate was added followed by 0.25 g (0.95 mmol) of the title compound of Step E added in 10 mL of 95% EtOH. The mixture was refluxed for 2 hrs and then diluted with 100 mL of water and extracted with 3×50 mL of EtOAc. The combined organic extracts were washed once with 100 mL of brine and dried and evaporated. The residue was chromatographed on 100 mL of silica gel using Hexanes/EtOAc 1:1 to afford 0.48 g (80%) of the title compound of this step as a colorless gum.

1. temperatureThe mixture was refluxed for 2 hrs
2. extractionextracted with 3×50 mL of EtOAc
3. washThe combined organic extracts were washed once with 100 mL of brine
4. customdried
5. customevaporated
6. customThe residue was chromatographed on 100 mL of silica gel