反应详情

To a solution of N′-((2R,3R)-2-(7-cyanobenzo[b]thiophen-4-ylamino)-3-hydroxybutanoyl)benzohydrazide (0.56 g, 1.42 mmol) in THF (120 mL) was added PS-BEMP (1.94 g, 4.27 mmol, ˜2.2 mmol/g) and p-TsCl (275 mg, 1.44 mmol) at room temperature. The mixture was stirred at room temperature for 18 h, then methanol (5 mL) was added to quench the reaction. The resin was filtered and washed with MeOH. The combined filtrate was concentrated to give a residue, which was purified by flash chromatography to afford the title compound 4-((1R,2R)-2-hydroxy-1-(5-phenyl-1,3,4-oxadiazol-2-yl)propylamino)benzo[b]thiophene-7-carbonitrile (229 mg, 43%). 1H NMR (400 MHz, Acetone-d6, δ in ppm) 7.98 (m, 2H), 7.85 (d, J=5.5 Hz, 1H), 7.71 (d, J=5.5 Hz, 1H), 7.64 (d, J=8.4 Hz, 1H), 7.51˜7.57 (m, 3H), 6.87 (d, J=8.4 Hz, 1H), 6.71 (d, J=8.8 Hz, 1H), 5.14 (dd, J=6.5, 8.8 Hz, 1H), 4.66 (d, J=6.0 Hz, 1H), 4.58 (m, 1H), 1.49 (d, J=6.2 Hz, 3H).

1. customto quench
2. customthe reaction
3. filtrationThe resin was filtered
4. washwashed with MeOH
5. concentrationThe combined filtrate was concentrated
6. customto give a residue, which
7. customwas purified by flash chromatography