Water → HCID 21251118, compound

Participants

Reaction Steps

p-Toluene sulfonic acid hydrate (0.282 g, 1.48 mmol) was dissolved in toluene (11 mL) and heated to reflux overnight with azeotropic removal of water (Dean-Stark trap). The next day, the reaction was cooled to room temperature and the product of Example 21, dissolved in toluene (4 mL), was added. The reaction was heated back to reflux for 0.5 hours. The reaction was cooled to room temperature and poured into sodium bicarbonate (sat) and extracted 3 times with ether. The organics were combined, washed with brine, dried over MgSO4, concentrated in vacuo. The residue was purified by column chromatography using hexane/ethyl acetate as eluant (gradient 100% to 9/1) to provide 0.278 g (97%) of methyl 3-amino-2,6-dimethoxyisonicotinate as a yellow solid. Electrospray Mass Spec: 212.8 (M+H)+

Provenance & Evidence