Potassium Carbonate → 7-bromo-3-{2-[(2R)-2-methyl-1-pyrrolidinyl]ethyl}isoquinoline

Participants

Reaction Steps

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.

Provenance & Evidence