反应详情

To a flask containing 8-[5-(S)-[(acetylamino)methyl]-2-oxo-3-oxazolidinyl]-1,2,4a, 5-tetrahydropyrazino[2,1-c][1,4]benzoxazine-3(4H)-carboxylic acid phenylmethyl ester (EXAMPLE 1, 150 mg, 0.31 mmol) in methanol (5 mL) and methylene chloride (5 mL) is introduced 10% palladium on carbon (70 mg). The mixture is placed under a hydrogen balloon for 17 hours, filtered through celite, and concentrated in vacuo. The residue is dissolved in methylene chloride (10 mL) and triethylamine (0.09 mL, 0.62 mmol) and benzyloxyacetyl chloride (0.06 mL, 0.40 mmol) are added at 0° C. under an inert atmosphere. The reaction is warmed to ambient temperature, stirred for 15 hours, washed with water (10 mL) and saline, concentrated in vacuo, and chromatographed on silica gel (230-400 mesh, 100 mL), eluting with chloroform/methanol (96/4). The appropriate fractions are combined (Rf= 0.46, TLC, chloroform/methanol, 90/10) and concentrated in vacuo to give the title compound, NMR (CDCl3) 7.36-7.29, 6.96-6.94, 6.85, 6.70, 4.69, 4.60, 4.50, 4.23-4.15, 3.97-3.91, 3.70-3.52, 3.27, 2.99, 2.82, 2.65, 2.44, 1.98.

1. customfor 17 hours
2. filtrationfiltered through celite
3. concentrationconcentrated in vacuo
4. dissolutionThe residue is dissolved in methylene chloride (10 mL)
5. washwashed with water (10 mL) and saline
6. concentrationconcentrated in vacuo
7. customchromatographed on silica gel (230-400 mesh, 100 mL)
8. washeluting with chloroform/methanol (96/4)
9. concentrationconcentrated in vacuo