Carbon Tetrachloride → HCID 12043645, compound

Participants

Reaction Steps

Methyl 4,5-dihydro-2-[4-(4-fluorophenoxy)phenyl]oxazole-4-carboxylate. To a solution of N-[4-(4-fluorophenoxy)benzoyl]-L-serine methyl ester (assumed to be 37 mmol from the previous reaction) and triphenylphosphine (0.38 g, 6.8 mmol) in acetonitrile (40 mL) was added diisopropylethyl amine (1.2 ml, 6.8 mmol) and carbon tetrachloride (0.66 mL, 6.8 mmol). The resulting solution was stirred at room temperature for 48 hours when TLC analysis indicated incomplete reaction. Triphenylphosphine (1.9 g, 7.2 mmol), diisopropylethyl amine (1.2 mL. 6.8 mmol) and carbon tetrachloride (0.66 mL, 6.8 mmol) was added to the reaction. The solution was stirred at room temperature for 16 hours and concentrated to dryness. The resulting solid was purified by column chromatography affording 910 mg (89%) of the desired product. 1H NMR (DMSO-d6): 7.88 (d, J=8.7 Hz, 2H), 7.29 (t, J=9.3 Hz, 2H), 7.20-7.17 (m, 2H), 7.03 (d, J=8.7 Hz, 2H), 4.95 (dd, J=8.1 Hz, 1H), 4.64-4.25 (m, 2H), 3.71 (s, 3H).

Provenance & Evidence