反应详情

The crude material from the reaction above N′-((2R,3S)-2-(3-chloro-4-cyano-2-methylphenylamino)-3-hydroxybutanoyl)benzohydrazide (intermediate 1b) (20.46 g, 52.89 mmol) was added to THF (800 mL) stirred at room temperature. Polystyrene fixed (2-tert-butylamino-2-diethylamino-1,3-dimethylperhydro-1,3,2-diazophosphorine) PS-BEMP (72.12 g, 158.67 mmol base, 2.2 mmol loading per gram base, Aldrich Chemical Company) was added to the solution followed by slow addition of para-toluenesulfonyl chloride (p-TSCl) (12.10 g, 63.47 mmol). The reaction mixture was stirred for 3 h and the progress of the reaction was monitored by TLC. After the completion of the reaction, the BEMP reagent was filtered off and the solution concentrated to get the crude material. The crude material was chromatographed on silica gel with hexanes:EtOAc (6:4) to get the product (5.0 g). 1H NMR (500 MHz, CDCl3, δ in ppm) 7.94 (d, J=9 Hz, 2H), 7.54 (m, 1H), 7.48 (m, 2H), 7.42 (d, J=9 Hz, 1H), 6.67 (d, J=9 Hz, 1H), 5.26 (d, J=9 Hz, 1H), 4.74 (d, J=9 Hz, 1H), 4.64 (m, 1H), 3.16 (d, J=5 Hz, 1H), 2.35 (s, 3H), 1.43 (d, J=6 Hz, 3H).

1. additionwas added to the solution
2. stirringThe reaction mixture was stirred for 3 h
3. customAfter the completion of the reaction
4. filtrationthe BEMP reagent was filtered off
5. concentrationthe solution concentrated
6. customto get the crude material
7. customThe crude material was chromatographed on silica gel with hexanes:EtOAc (6:4)