Hydrochloric Acid → 3-Ethoxy-2-hydroxy-5-(5-(3-methoxyphenyl)-2-oxo-6-(pyridin-3-yl)-1,2,3,4-tetrahydropyrimidin-4-yl)benzoic acid

Participants

Reaction Steps

To a solution of 2-(3-methoxyphenyl)-1-(pyridin-3-yl)ethanone (Intermediate 69) (70 mg, 0.31 mmol), 3-ethoxy-5-formyl-2-hydroxy-benzoic acid (Intermediate 62) (65 mg, 0.31 mmol) and urea (60 mg, 1.0 mmol) in 3 mL of ethanol was added 0.2 mL of concentrated HCl, then the mixture was refluxed for 2 days. The solvent was removed and the residue was purified by reverse-phase preparatory HPLC (26-53% acetonitrile+0.1% trifluoroacetic acid in water+0.1% trifluoroacetic acid, over 15 min.) to give Compound 135 (25 mg, yield 16.9%). 1H NMR (CD3OD 400 MHz): δ 8.73 (d, J=6.8 Hz, 1H), 8.72 (s, 1H), 8.52 (d, J=8.4 Hz, 1H), 7.50 (d, J=2.0 Hz, 1H), 7.08 (t, J=8.0 Hz, 1H), 7.01 (d, J=2.4 Hz, 1H), 7.17 (m, 3H), 6.98 (d, J=2.4 Hz, 1H), 6.74 (dd, J1=2.4 Hz, J2=8.4 Hz, 1H), 6.50 (dd, J1=2.4 Hz, J2=12.0 Hz, 2H), 5.41 (s, 1H); 4.00 (m, 2H), 3.63 (s, 3H), 1.36 (t, J=6.8 Hz, 3H); MS (ESI): m/z 462.1 [M+1]+.

Provenance & Evidence