反应详情

To a 330 mg sample of 4-methyl-3-(2-(S)-pyrrolidinylmethoxy)pyridine (from Example 27 above) was added a solution of formic acid/formaldehyde (1:2, 2 mL). The mixture was heated at reflux for 5 hours, and the volatiles were removed by evaporation. The residue was dissolved in 1 mL of 20% NaOH. The solution was extracted with CH2Cl2 (3×), then the organic layer was dried (Na2SO4) and concentrated. The crude product was purified by chromatography over silica gel to afford 295 mg of the title compound. MS (DCI/NH3) m/e: 207 (M+H)+. 1H NMR (CDCl3, 300 MHz) δ: 8.17 (s, 1H), 8.12 (d, J=5.5 Hz, 1H), 7.06 (d, J=5.5 Hz, 1H), 4.07 (dd, J=3.3, 10.6 Hz, 1H), 3.98 (dd, J=7.4, 10.6 Hz, 1H), 3.15-3.08 (m, 1H), 2.76-2.68 (m, 1H), 2.53 (s, 3H), 2.38-2.25 (m, 1H), 2.26 (s, 3H), 2.12-1.67 (m, 4H).

1. temperatureThe mixture was heated
2. temperatureat reflux for 5 hours
3. customthe volatiles were removed by evaporation
4. dissolutionThe residue was dissolved in 1 mL of 20% NaOH
5. extractionThe solution was extracted with CH2Cl2 (3×)
6. dry with materialthe organic layer was dried (Na2SO4)
7. concentrationconcentrated
8. customThe crude product was purified by chromatography over silica gel