反应详情

To a solution of methyl 2-(2,6-difluoro-4-hydroxy-phenyl)thiazole-4-carboxylate (207 mg, 0.763 mmol) and (R)-3-hydroxytetrahydrofuran (3 equiv., 206 mg) in tetrahydrofuran (5 mL) was added triphenylphosphine (3 equiv., 600 mg) and diisopropyl azodicarboxylate (3 equiv., 0.45 mL) The mixture was stirred at RT for 2 days. The mixture was concentrated and partitioned between EtOAc and water. The organic layer was washed with sat. NaHCO3, brine, dried over Na2SO4 and concentrated. This residue was diluted with THF (3 mL) and water (1 mL) and LiOH (36 mg) was added. After stirring at rt for 2.5 hours, the reaction was neutralized with 1 N HCl(aq), diluted with EtOAc and washed with brine. The organic extracts were dried (Na2SO4) and concentrated in vacuo to provide the title compound, contaminated with triphenylphosphine oxide, and other by-products, which was used without further purification.

1. concentrationThe mixture was concentrated
2. custompartitioned between EtOAc and water
3. washThe organic layer was washed with sat. NaHCO3, brine
4. dry with materialdried over Na2SO4
5. concentrationconcentrated
6. additionThis residue was diluted with THF (3 mL) and water (1 mL) and LiOH (36 mg)
7. additionwas added
8. stirringAfter stirring at rt for 2.5 hours
9. additiondiluted with EtOAc
10. washwashed with brine
11. dry with materialThe organic extracts were dried (Na2SO4)
12. concentrationconcentrated in vacuo