反应详情

A mixture of (2R,4R)-4-amino-5-(3′-chlorobiphenyl-4-yl)-2-hydroxypentanoic acid ethyl ester (150.0 mg, 431 μmol), benzyl alcohol (446.2 μL, 4.3 mmol), and 4.0 M HCl in 1,4-dioxane (431 μL, 1.7 mmol) was stirred at room temperature overnight, then at 50° C. for 1 hour. The mixture was then concentrated under reduced pressure. 5-Hydroxy-1-pyridin-2-yl-1H-pyrazole-3-carboxylic acid (44.2 mg, 216 μmol) and HATU (98.4 mg, 259 mol) were stirred in DMF (0.5 mL, 5 mmol) for 10 minutes, then added to the concentrated mixture, along with DIPEA (113 μL, 647 μmol). The resulting mixture was stirred at room temperature for 2 hours and concentrated under reduced pressure. The residue was dissolved in 50% AcOH-water (5 mL), filtered, and purified by reverse phase preparative HPLC to yield the title compound (19.5 mg).

1. waitat 50° C. for 1 hour
2. concentrationThe mixture was then concentrated under reduced pressure
3. stirringThe resulting mixture was stirred at room temperature for 2 hours
4. concentrationconcentrated under reduced pressure
5. dissolutionThe residue was dissolved in 50% AcOH-water (5 mL)
6. filtrationfiltered
7. custompurified by reverse phase preparative HPLC