Methanol → Methyl 5-({4-[(4-butylphenyl)ethynyl]benzyl}amino)-2-fluorobenzoate

Participants

Reaction Conditions

Reaction Steps

A solution of methyl 5-amino-2-fluorobenzoate (1.20 g, 7.1 mmol, described in J. Chem. Soc. Perkin Trans. I, 1975, 1283-1284 and J. Org. Chem., 1990, 2034-2044) and 4-[(4-butylphenyl)ethynyl]benzaldehyde (1.95 g, 7.4 mmol, intermediate which may be obtained according to methods disclosed in EP03103780.7) in toluene (30 ml) was heated under reflux for 2.5 hrs with azeotropic removal of water. The reaction mixture was cooled down to 0° C., then MeOH (30 mL) and sodium borohydride (540 mg, 14.2 mmol) were added. The reaction mixture was stirred at 0° C. for 30 min, then at rt for 1 hr. The reaction mixture was diluted with a saturated aqueous solution of NaCl (100 mL) and water (30 mL) and then extracted with Et2O (300 mL+50 mL). The combined organic layers were dried over MgSO4 and the solvents were removed under reduced pressure. The residual brown gummy oil was taken up in MeOH (10 mL) and a white solid precipitated out. Filtration and washing with MeOH (2×) gave 2.23 g (76%) of the title compound as a white powder. HPLC, Rt: 5.8 min (purity: 98.2%). LC/MS, M−(ESI): 414.0. 1H NMR (CDCl3) δ: 7.51 (d, J=7.9 Hz, 2H), 7.45 (d, J=8.0 Hz, 2H), 7.34 (d, J=8.0 Hz, 2H), 7.17 (m, 3H), 6.97 (m, 1H), 6.76 (m, 1H), 4.35 (s, 2H), 3.92 (s, 3H), 2.63 (t, J=7.8 Hz, 2H), 1.61 (m, 2H), 1.37 (m, 2H), 0.94 (t, J=7.4 Hz, 3H).

Provenance & Evidence