Benzaldehyde → HCID 67258928, compound

Participants

Reaction Conditions

Reaction Steps

A mixture of 4-aminoisobenzofuran-1(3H)-one (0.4 g, 2.68 mmol) and benzaldehyde (0.72 g, 6.7 mmol) in ethylpropionate (20 mL) was cooled to 0° C. Then a solution of sodium methoxide in methanol [sodium (248 mg, 10.72 mmol) in methanol (20 mL)] was added dropwise. After the addition, the mixture was heated at reflux for 16 hr. The mixture was quenched with water (10 mL) and solvent was removed in vacuum. The residue was dissolved in water, acidified with 1N hydrochloric acid to pH=6, then extracted with ethyl acetate (50 mL×3). The combined organic layers were washed with brine, dried over anhydrous sodium sulfate, and concentrated to give crude product. The crude product was purified by prep-HPLC to give methyl 4-oxo-2,3-diphenyl-1,2,3,4-tetrahydroquinoline-5-carboxylate (256 mg, yield 27%) and ethyl 4-oxo-2,3-diphenyl-1,2,3,4-tetrahydroquinoline-5-carboxylate (140 mg, yield 14%) as a light yellow solid. Methyl 4-oxo-2,3-diphenyl-1,2,3,4-tetrahydroquinoline-5-carboxylate: MS (ESI) m/z: 358 (M+1)+. 1H-NMR (400 MHz, CDCl3) δ 3.86 (s, 3H), 3.95-3.98 (d, J=16.4 Hz, 1H), 4.81-4.84 (d, J=12.8 Hz, 1H), 4.89 (s, br 1H), 6.72-6.77 (m, 2H), 6.90-6.93 (m, 2H), 7.11-7.21 (m, 8H), 7.34-7.36 (t, J=7.8 Hz, 1H).

Provenance & Evidence