反应详情

To a solution of 4-cyano-3-(2,4-dichlorophenyl)-5-morpholin-4-ylthiophene-2-carboxylic acid (3.10 g, 8.2 mmol) and N-(2-aminoethyl)(tert-butoxy)carboxamide (1.98 gr, 12.3 mmol) in methylene chloride (60 mL) was added N-(3-dimethylaminopropyl)-N′-ethylcarbodiimide hydrochloride (3.15 gr, 16.4 mmol) and 1-hydroxybenzotriazole (2.22 gr, 16.4 mmol) at room temperature. The solution was allowed to stir overnight. The reaction was diluted with methylene chloride and water. The layers were separated and the organic layer was dried over anhydrous sodium sulfate, filtered and concentrated in vacuo. The residue was purified by column chromatography to give the intermediate boc-protected product as a yellow solid. The material was dissolved in dioxane (4 mL) and a solution 4N HCl in dioxane (9 mL) was added. The solution was stirred at room temperature for 30 minutes. The solvents were evaporated and the residue was dried under vacuum overnight. The product was converted to the free base by suspension in methylene chloride followed by addition of sodium carbonate solution. The layers were separated and the aqueous layer was extracted twice with methylene chloride. The combined organic extracts were dried over anhydrous sodium sulfate, filtered and concentrated in vacuo to afford the product as a free base (2.55 gr, 67%). LCMS: (FA) ES+ 463. 1H NMR (400 MHz, d1-chloroform) δ: 7.59-7.55 (m, 1H), 7.43-7.30 (m, 2H), 3.90-3.82 (m, 4H), 3.64-3.57 (m, 4H), 3.53-2.85 (m, 4H).

1. customThe layers were separated
2. dry with materialthe organic layer was dried over anhydrous sodium sulfate
3. filtrationfiltered
4. concentrationconcentrated in vacuo
5. customThe residue was purified by column chromatography
6. customto give the intermediate boc-
7. stirringThe solution was stirred at room temperature for 30 minutes
8. customThe solvents were evaporated
9. customthe residue was dried under vacuum overnight
10. additionfollowed by addition of sodium carbonate solution
11. customThe layers were separated
12. extractionthe aqueous layer was extracted twice with methylene chloride
13. dry with materialThe combined organic extracts were dried over anhydrous sodium sulfate
14. filtrationfiltered
15. concentrationconcentrated in vacuo