Ammonia → HCID 67207384, compound

Participants

Reaction Steps

Paraformaldehyde (0.35 g) was added in portions to a mixture of phenol (487.8 mg, 3.33 mmol), triethylamine (1.3 mL, 9.33 mmol), and anhydrous MgCl2 (0.98 g, 10.3 mmol) in acetonitrile (30 mL). The mixture was refluxed for 48 h, cooled to room temperature, acidified with aqueous 3 N HCl solution, and extracted with ether. The ether layer was washed with water, and brine, and dried (MgSO4). Removal of solvent yielded a crude material which was purified by column chromatography (SiO2) to yield 3-chloro-5-fluoro-2-hydroxybenzaldehyde. To this aldehyde (0.25 mmol) in at room temperature was added 3 mL of NH3 (2.0 M solution in EtOH) solution and the solution was stirred overnite (upon addition of NH3 in ethanol, the solution changed to yellow). TosMIC (0.30 mmol equiv) and piperazine (0.38 mmol) were then added directly to the solution at room temperature in solid form. The solution were stirred at room temperature for 3 h until completion confirmed by TLC monitor. The solvent was evaporated mostly under reduced pressure and the crude was purified by column chromatography using 1:1 Hexanes and Ethyl acetate mixtures to afford the desired product as a light yellow solid. Yield=65%. 1H NMR (MeOH-d4): 6.95-6.99 (m, 1H), 7.29-7.33 (m 1H), 7.61 (s, 1H), 7.84 (s, 1H).

Provenance & Evidence