反应详情

Maleic acid (0.067 g, 0.630 mmol) was added to a hot slurry of (2S,3R)—N-(2-((3-pyridinyl)methyl)-1-azabicyclo[2.2.2]oct-3-yl)benzofuran-2-carboxamide (0.203 g, 0.560 mmol) in isopropyl acetate (2 mL), depositing fine, white solids, along with a gummy residue. Additional isopropyl acetate (3 mL) and maleic acid (0.006 g) were added, and the mixture was heated to reflux. Isopropanol (5 mL) was added at reflux. The resulting mixture of white solids was cooled to ambient temperature, filtered, and the solids were washed with isopropyl acetate (2 mL). The product was dried under vacuum at 60° C. for 18 h to give 0.228 g of an off-white, flaky solid (84.7% yield), mp 180-182° C. 1H NMR (DMSO-d6) indicated a mono-salt stoichiometry. Calc'd for C22H23N3O2 C4H4O4: C, 65.40; H, 5.70; N, 8.80. Found: C, 65.35, 65.29; H, 5.86, 5.68; N, 8.69, 8.78.

1. temperaturethe mixture was heated to reflux
2. temperatureat reflux
3. additionThe resulting mixture of white solids
4. filtrationfiltered
5. washthe solids were washed with isopropyl acetate (2 mL)
6. customThe product was dried under vacuum at 60° C. for 18 h