反应详情

A solution of the product prepared in Step D (1.33 g, 4.84 mmol, 1 eq), ethyl 3-(3,5-difluoro-4-hydroxyphenyl)propanoate (1.78 g, 7.74 mmol, 1.6 eq), 1,1′-(azodicarbonyl)dipiperidine (2.52 g, 9.68 mmol, 2 eq) and tri-n-butylphosphine (3.08 mL, 12.1 mmol, 2.5 eq) in toluene (85 mL) was heated to 60° C. under N2. After 3 hr, heptane (170 mL) was added and the resulting suspension allowed to cool to room temperature over 30 min. The resulting white solid byproduct was filtered, washed with heptane, and the filtrate concentrated. The resulting residue was purified by flash chromatography (120 g column) eluting with 2 to 12% EtOAc/heptane to yield ethyl 3-(4-((1-(4-chlorophenyl)-3-(trifluoromethyl)-1H-pyrrol-2-yl)methoxy)-3,5-difluorophenyl)propanoate.

1. filtrationThe resulting white solid byproduct was filtered
2. washwashed with heptane
3. concentrationthe filtrate concentrated
4. customThe resulting residue was purified by flash chromatography (120 g column)
5. washeluting with 2 to 12% EtOAc/heptane