Carbon Tetrachloride → 1-((5-fluorobenzo[d]oxazol-2-yl)methyl)-5-(4-methoxyphenyl)pyridin-2(1H)-one

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Reaction Steps

According to Scheme 10 Method A: A solution of PPh3 (3 eq, 1.04 mmol, 0.27 g) in 1:1 acetonitrile/pyridine (3 mL) was added dropwise over a period of 1 hour to a mixture of 2-(5-(4-methoxyphenyl)-2-oxopyridin-1(2H)-yl)acetic acid (1 eq, 0.35 mmol, 0.09 g, Example 14 Step 2), 2-amino-4-fluorophenol (1 eq, 0.35 mmol, 0.04 g), Et3N (3 eq, 1.04 mmol, 0.15 mL) and CCl4 (4 eq, 1.39 mmol, 0.13 mL) in 1:1 mixture of acetonitrile/pyridine (3 mL). The reaction mixture was stirred at room temperature for 2 days. The solvent was removed under reduced pressure and the residue was dissolved in CH2Cl2 and NH4OH. The aqueous phase was extracted 3 times with CH2Cl2. The combined organic fractions were washed with brine, dried over Na2SO4, filtered and concentrated under reduced pressure. The crude product was purified by flash chromatography over silica gel (AIT Flashsmart prepacked column 15 g SiO2) using CH2Cl2/AcOEt 90/10 as eluent to afford 1-((5-fluorobenzo[d]oxazol-2-yl)methyl)-5-(4-methoxyphenyl)pyridin-2(1H)-one (0.06 mmol, 0.02 g, 16%) as a brown solid.

Provenance & Evidence