反应详情

The compound [(2S,3S)-2-amino-3-hydroxy-hex-4-ynyl]-carbamic acid benzyl ester (173 mg, 0.46 mmol, prepared as described in WO PCT 0250019) was dissolved in 5 mL of 1:1 CH2Cl2/DMF. The resultant solution was charged sequentially with 2-methyl-malonic acid (54 mg, 0.46 mmol), meta-trifluoromethylaniline (0.06 mL, 0.46 mmol), N,N-diisopropylethylamine (0.8 mL, 4.6 mmol) and HATU (434 mg, 1.1 mmol). The mixture was stirred for 12 h at RT, concentrated in vacuo, and partitioned between EtOAc and sat. NH4Cl. The aqueous phase was extracted with EtOAc (1×). The combined organic extracts were washed with sat. NaHCO3 and brine, dried (Na2SO4), filtered, and concentrated in vacuo. The residue was purified by flash chromatography to provide {(2S,3S)-3-hydroxy-2-[2-(3-trifluoromethyl-phenylcarbamoyl)-propionylamino]-hex-4-ynyl}-carbamic acid benzyl ester (40 mg, 17% yield). MS found: (M+Na)+=528.4. (25b) A solution of {(2S,3S)-3-hydroxy-2-[2-(3-trifluoromethyl-phenylcarbamoyl)-propionylamino]-hex-4-ynyl}-carbamic acid benzyl ester (40 mg, 0.08 mmol) in MeOH (2 mL) was charged with 5% Pd/C, Degussa style (8 mg), stirred under H2 (1 atm) for 12 h at RT, filtered, and concentrated in vacuo. The residue was dissolved in MeOH (2 mL). The resultant solution was charged sequentially with 2,4-dimethylbenzaldehyde (0.009 mL, 0.06 mmol) and sodium cyanoborohydride (5 mg, 0.08 mmol), stirred for 12 h at RT, quenched with sat. NaHCO3, and extracted twice with EtOAc. The organic extracts were combined, washed with brine, dried (Na2SO4), filtered, and concentrated in vacuo. Purification of the residue by reverse-phase HPLC provided the title compound as a white powder after lyopholization. MS found: (M+H)+=494.4.

1. filtrationfiltered
2. concentrationconcentrated in vacuo
3. dissolutionThe residue was dissolved in MeOH (2 mL)
4. stirringstirred for 12 h at RT
5. customquenched with sat. NaHCO3
6. extractionextracted twice with EtOAc
7. washwashed with brine
8. dry with materialdried (Na2SO4)
9. filtrationfiltered
10. concentrationconcentrated in vacuo
11. customPurification of the residue by reverse-phase HPLC