反应详情

To a solution of 3-(2-Ethylpyrid-3-ylamino)-6-methyl-1-(ethoxycarbonylmethyl)pyrazinone (0.058 g, 0.183 mMol) from step 3 above in 6 mL of 1:1:1-tetrahydrofuran:methanol:water was added 183 μL (0.183 mMol) of 1N sodium hydroxide solution. The solution was stirred at ambient temperature for 18 h at which time 183 μL (0.183 mMol) of 1N hydrochloric acid solution was added. The solution was concentrated in vacuo several times from methanol and the residue was triturated with diethyl ether. The resulting precipitate was filtered off to afford the title compound as a beige powder (0.039 g; HPLC RT=3.13 min, method A).

1. additionwas added
2. concentrationThe solution was concentrated in vacuo several times from methanol
3. customthe residue was triturated with diethyl ether
4. filtrationThe resulting precipitate was filtered off