反应详情

3-Methylpicolinic acid (50 g, 365 mmol) was dissolved in 400 mL of EtOH:H2O (1:1) with 60 mL of aq. HCl (32%). PtO2 (5 g) was then added and the reaction stirred at rt under a hydrogen balloon until NMR indicated completion. The reaction was filtered through diatomaceous earth and concentrated to yield the title compound as a white solid which was used without further purification (60.5 g, 92%). 1H NMR (MeOD, 400 MHz) δ 4.13-4.11 (m, 1H), 3.40-3.33 (m, 1H), 3.05-2.99 (m, 1H), 2.61-2.58 (m, 1H), 1.92-1.72 (m, 4H), 1.09 (d, J=7.0 Hz, 3H). MS (ESI) 452.16 (M+H).

1. filtrationThe reaction was filtered through diatomaceous earth
2. concentrationconcentrated