Analyzing the synthesis route of 24673-56-1

24673-56-1, The synthetic route of 24673-56-1 has been constantly updated, and we look forward to future research findings.

With the rapid development and complex challenges of chemical substances, new drug synthesis pathways are usually the most effective.24673-56-1,3-Methylbenzofuran-2-carboxylic acid,as a common compound, the synthetic route is as follows.

A. N,3-dimethylbenzofuran-2-carboxamide[0218] A mixture of 3-methylbenzofuran-2-carboxylic acid (1.0 kg, 5.676mol) in methylene chloride (5.8L) and DMF (5mL) was chilled to ~ 2 0C. A solution of oxalyl chloride (864g, 6.81 mol) was added to the reaction mixture keeping the temperature below 10 0C, over a period of 2 hrs. A vigorous evolution of a gas was observed. The reaction mixture was stirred overnight under nitrogen at room temperature and then refluxed for 3 hrs. All of the solids were dissolved to give a brown color solution. HPLC analysis of an aliquot indicated that the reaction was complete. The mixture was concentrated on a rotary evaporator and the residual oxalyl chloride was chased with DCM (2L). The solid product was re-dissolved in DCM (6L) in a round bottom flask (1 OL) and chilled to ~ – 50C. A solution of methyl amine (40% in water, 1.7L, 3.5 eq, 19.86 mol) was carefully added to the acid chloride solution while keeping the temperature below 8 0C then stirred overnight at room temperature. Analysis of an aliquot indicated that the reaction was complete. Water (8.0L) was added to the reaction mixture, the layers were separated, the aqueous layer was back extracted with DCM (2×3 L), the combined organic layer was washed with water (4L) and dried over Na2SO4. The organic layer was filtered, the filtrate was concentrated and traces of DCM were co evaporated with heptanes (2L). The heptanes slurry was filtered and the cake was washed with heptanes (2x2L). All the brown color was removed in the heptane filtrate. The solid product was dried under high vacuum overnight to a constant weight. Yield of the title compound was 1.015 kg (94.5%. 1H NMR (CDCl3) : delta (ppm) 8.45 (s,lH), 7.61 (d, IH), 7.41 (m, 2 H), 7.30 (m, 1 H), 3.03 (d, 2 H), 2.63 (s, 3 H). HPLC: 99.0 area% (Rtau = 7.91 min)

24673-56-1, The synthetic route of 24673-56-1 has been constantly updated, and we look forward to future research findings.

Reference£º
Patent; AFFINIUM PHARMACEUTICALS, INC.; WO2008/98374; (2008); A1;,
Benzofuran – Wikipedia
Benzofuran | C8H6O – PubChem