4-Fluorophenol → HCID 11538363, compound

Participants

Reaction Steps

In a stirring solution of THF (10 mL) under N2, 2 equivalents of 4-fluorophenol (1.40 g, 12.4 mmol) was added to a solution of 1-Phenyl-3-(4-phenyl-piperazin-1-yl)-propan-1-ol (20) (1.84 g, 6.22 mmol) and allowed to dissolve. 1.5 equivalents of triphenylphosphine, PPh3, (2.49 g, 9.32 mmol) was then added and dissolved. After the reaction was allowed to equilibrate at a temperature between 10-15° C., 1.5 equivalents of diisopropyl azodicarboxylate, DLAD, (1.85 mL, 9.32 mmol) was added dropwise. The reaction was then allowed to return to room temperature and continued stirring for 48 hours. The solvent was then evaporated under reduced pressure and aspirated under vacuum for an extended period. Purification was performed by Flash Column Chromatography on silica gel by first washing with 500 mL of 10% EtOAc/hexanes and then extracting with 20% EtOAc/hexanes. Analytical thin-layer chromatography showed that the desired product had an Rf value of approximately 0.56 when developed in 30% EtOAc/hexanes. The fractions containing the desired product were combined, and the solvent was removed under reduced pressure. 0.70 g of the product 1a (1.795 mmol, 29%) was obtained as a yellow, clear oil. 1H-NMR (CDCl3): δ 7.29 (7H, m), 6.93 (2H, d, J=7.93 Hz), 6.86 (5H, m), 5.16 (1H, dd, J=5.00, 4.96 Hz), 3.21 (4H, t, J=4.85, 5.10 Hz), 2.60 (6H, m), 2.23 (1H, sextuplet, J=7.26, 6.75, 7.44, 6.91, 7.72 Hz), 2.02 (1H, m). 13C-NMR (CDCl3): δ 155.62, 154.34, 151.28, 141.61, 129.11, 128.63, 127.69, 126.02, 119.72, 117.15, 117.04, 116.09, 115.80, 115.50, 79.34, 54.62, 53.26, 49.15, 35.96. 19F-NMR(CDCl3): δ −123.77.

Provenance & Evidence