Acetic Acid → HCID 18438119, compound

Participants

Reaction Conditions

Reaction Steps

1.4 M MeLi in Et2O (1.54 ml, 2.16 mmol) is slowly added to a solution of 5-butyl-4-phenyl-pyrimidine (436 mg, 2.05 mmol) in Et2O (6 mL) at −30° C. under N2. The reaction mixture is stirred at −30° C. for 30 minutes and then at 0° C. for 45 minutes. Next, a solution of AcOH (0.12 mL) and H2O (0.02 mL) in THF (2 mL) is added, followed by a solution of 2,3-dichloro-5,6-dicyano-1,4-benzophenone (DDQ) (466 mg, 2.05 mmol) in THF (5 mL). The resulting mixture is stirred at room temperature for 5 minutes, recooled to 0° C., and then treated with 3.0 M aqueous NaOH. The mixture is stirred at 0° C. for 5 minutes, diluted with H2O, and extracted twice with Et2O. The combined extracts are dried over Na2SO4 and concentrated. The dark residue is purified by flash chromatography on silica gel. Elution with 2:1 Hex-EtOAc followed by 1:1 hexanes-EtOAc affords 5-butyl-4-methyl-6-phenyl-pyrimidine as a light yellow oil. 1H NMR (CDCl3, 300 MHz) δ 8.95 (s, 1H), 7.45 (m, 5H), 2.67–2.62 (m, 2H), 2.61 (s, 3H), 1.48–1.40 (m, 2H), 1.25 (sext, J=7.2 Hz), 0.82 (t, J=7.2 Hz, 3H) ppm. MS: m/z 227 [M+1].

Provenance & Evidence