Hydrochloric Acid → 2-Fluoro-6-hydroxy-4-(2-oxo-5,6-diphenyl-1,2,3,4-tetrahydropyrimidin-4-yl)benzoic acid

Participants

Reaction Conditions

Reaction Steps

To a solution of methyl 2-fluoro-4-formyl-6-hydroxybenzoate (Intermediate 83) (150 mg, 0.76 mmol), 1,2-diphenylethanone (150 mg, 0.76 mmol) and urea (144 mg, 2.4 mmol) in ethanol (5 mL) was added conc. HCl (0.2 mL) and the reaction mixture was refluxed under N2 overnight. Removed solvent in vacuo and the residue (320 mg) was used without further purification. A mixture of this intermediate compound (320 mg) and aqueous NaOH (2 M, 10 mL) in MeOH (10 mL) was stirred at 40° C. for 3 hours. The resulting mixture was cooled and acidified with aqueous HCl (2 M, 12 mL) and a standard aqueous/EtOAc workup was followed. Purification by prep-HPLC (0.1% TFA as additive) gave Compound 158 as a yellow solid (41 mg, two step yield 13%). 1H NMR (CD3OD 400 MHz): δ 7.30-7.20 (m, 5H), 7.10-7.05 (m, 3H), 6.91-6.88 (m, 2H), 6.75 (s, 1H), 6.65 (d, J=11.6 Hz, 1H), 5.29 (s, 1H). MS (ESI): m/z 405.0 [M+1]+.

Provenance & Evidence