反应详情

To a solution of 4,5-bis(phenylmethoxy)-2-pyridinecarboxylic acid, phenylmethyl ester (1.60 g, 3.76 mmole) in 15 ml of tetrahydrofuran and 2.2 ml of water was added 4 ml of 1N aqueous potassium hydroxide. The mixture was stirred at room temperature overnight. Water (15 ml) was added and 1N hydrochloric acid was added slowly with stirring while monitoring the pH. The pH of the mixture fell steadily to ca. 6.2 whereupon a large amount of solid began to separate and no further decrease in the pH was noted. Continued addition of hydrochloric acid eventually effected a sudden drop in pH to 3.2 and the addition was stopped. The solid was filtered and washed well with water, then ether, and dried in vacuo to afford 1.197 g of the title compound as a white waxy solid.

1. stirringwith stirring
2. customto separate
3. additionContinued addition of hydrochloric acid
4. additionthe addition
5. filtrationThe solid was filtered
6. washwashed well with water
7. dry with materialether, and dried in vacuo