反应详情

To a solution of tert-butyl 5-cyano-3-methylpicolinate (synthesized according to procedure described in WO2012095521; 4.18 g, 19.15 mmol) in dichloromethane (96 ml) was added TFA (Aldrich, 148 ml, 1915 mmol). The reaction mixture was stirred at room temperature for 2 hrs. The reaction mixture was concentrated under reduced pressure and the residue was triturated with EtOAc. The yellow slurry was concentrated under reduced pressure. The residue was triturated with 30 mL of methyl tert-butyl ether (30 mL) and of hexanes (50 mL) to yield 5-cyano-3-methylpicolinic acid (2.91 g, 17.95 mmol, 94% yield) as yellow solid.

1. concentrationThe reaction mixture was concentrated under reduced pressure
2. customthe residue was triturated with EtOAc
3. concentrationThe yellow slurry was concentrated under reduced pressure
4. customThe residue was triturated with 30 mL of methyl tert-butyl ether (30 mL) and of hexanes (50 mL)