Urea → HCID 51347329, compound

Participants

Reaction Steps

To a mixture of (R)-2-phenyl-1-(tetrahydrofuran-2-yl)ethanone (Intermediate 94) (200 mg, 1.0 mmol), 3-ethoxy-4-hydroxy-5-nitrobenzaldehyde (266 mg, 1.3 mmol), and urea (189 mg, 3.2 mmol) in absolute ethanol (3 mL) was added conc. HCl (one drop). The mixture was refluxed under N2 for 3.5 hrs. The reaction mixture was concentrated under reduced pressure and purified by silica gel column chromatography (PE:EtOAc=10:1 to PE:EtOAc=1:2) and prep-HPLC (0.1% TFA as additive) to give Compound 176 (21 mg, yield 5%). 1H NMR (DMSO 400 MHz): δ 10.18 (s, 1H), 8.34 (s, 1H), 7.64 (s, 1H), 7.34-7.27 (m, 5H), 7.16-7.10 (m, 1H), 7.07-7.04 (m, 1H), 5.38 (s, 1H), 4.26-4.21 (m, 1H), 4.03-3.92 (m, 3H), 3.92-3.87 (m, 1H), 2.22-2.18 (m, 1H), 2.17-2.04 (m, 2H), 2.00-1.95 (m, 1H), 1.32-1.22 (m, 3H); MS (ESI): m/z 426.0[M+1]+.

Provenance & Evidence