4-(3-Hydroxypropyl)Benzeneboronic Acid → 1-(4-chlorobenzyl)-5-(4-(3-hydroxypropyl)phenyl)pyridin-2(1H)-one

Participants

Reaction Conditions

Reaction Steps

According to Scheme 3 Method A: To a solution of 1-(4-chlorobenzyl)-5-bromopyridin-2(1H)-one (1 eq, 0.33 mmol, 0.10 g) in dioxane/saturated aqueous NaHCO3 (1:1, 6 mL) was added Pd(PPh3)4 (0.15 eq, 0.05 mmol, 58 mg) and 4-(3-hydroxypropyl)phenylboronic acid (1.5 eq, 0.50 mmol, 90.0 mg). The reaction was then stirred at 90° C. for 4.5 hours. The reaction was allowed to cool and diluted with AcOEt. The reaction washed with saturated NH4Cl solution, brine and the organic phase extracted (×3). The combined organic fractions were dried (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 pure AcOEt as the eluent to afford 1-(4-chlorobenzyl)-5-(4-(3-hydroxypropyl)phenyl)pyridin-2(1H)-one (0.22 mmol, 78 mg, 66%) as a white solid. M.p.: 165° C.; Rf=0.05 (CH2Cl2/AcOEt 80/20); LC (XTerra RP18, 3.5 μm, 3.0×50 mm Column): RT=3.78 min; MS m/z (CI) [MH]+=354, 356; 1H NMR (300 MHz, DMSO-d6) δ 1.64-1.77 (m, 2H), 2.61 (t, J=7.3 Hz, 2H), 3.32-3.46 (m, 2H), 4.48 (t, J=5.1 Hz, 1H), 5.15 (s, 2H), 6.52 (d, J=9.5 Hz, 1H), 7.24 (d, J=8.1 Hz, 2H), 7.35-7.44 (4H), 7.47 (d, J=8.1 Hz, 2H), 7.83 (dd, J=2.6 Hz, 9.5 Hz, 1H), 8.23 (d, J=2.6 Hz, 1H).

Provenance & Evidence