反应详情

The product from Example 52F was dissolved in a solution of (2R)-2-methylpyrrolidine (0.26 g, 3.0 mmol) in acetonitrile (20 mL). The solution was treated with potassium carbonate (0.5 g, 3.6 mmol) and heated at 50–55° C. for 20 hours in a sealed flask. The mixture was allowed to cool to room temperature, filtered, and the filtrate was concentrated in vacuo. The residue was diluted with MTBE (20 mL) and water (20 mL) and the pH was adjusted to 3–3.5 with concentrated HCl. The aqueous layer was separated, extracted with MTBE (10 mL), adjusted to a pH of 8–8.5 with potassium carbonate, and extracted with isopropyl acetate (20 mL). The organic layer was separated and concentrated in vacuo. The residue was dissolved in heptane (20 mL), filtered, and the filtrate concentrated under vacuum to provide the title compound. 1H NMR (CDCl3) δ 1.10 (d, J=6.1 Hz, 3H); 1.35–1.49 (m, 1H); 1.62–1.85 (m, 2H); 1.85–1.98 (m, 1H); 2.23 (q, J=8.8. Hz, 1H); 2.28–2.42 (m, 1H); 2.46–2.57 (m, 1H), 3.04–3.19 (m, 2H); 3.19–3.30 (m, 2H); 7.47 (s, 1H); 7.60 (d, J=8.8 Hz, 1H), 7.647.70 (m, 1H), 8.05 (m, 1H); 9.09 (s, 1H); HRMS Calcd. for [C16H19BrN2+H+]: 319.0810. Found: 319.0795.

1. temperatureheated at 50–55° C. for 20 hours in a sealed flask
2. filtrationfiltered
3. concentrationthe filtrate was concentrated in vacuo
4. additionThe residue was diluted with MTBE (20 mL) and water (20 mL)
5. customThe aqueous layer was separated
6. extractionextracted with MTBE (10 mL)
7. extractionextracted with isopropyl acetate (20 mL)
8. customThe organic layer was separated
9. concentrationconcentrated in vacuo
10. dissolutionThe residue was dissolved in heptane (20 mL)
11. filtrationfiltered
12. concentrationthe filtrate concentrated under vacuum