反应详情

To a mixture of 0.078 g (0.15 mmole) of 4-(3-chloro-phenyl)-2-[6-(4-morpholin-4-yl-butyl)-benzoimidazol-1-yl]-thiazole-5-carboxylic acid ethyl ester (I.41f), 2 mL of tetrahydrofuran and 2 mL of water was added 0.034 g (1.49 mmole) of lithium hydroxide. The mixture was stirred at ambient temperature for 2 hours, then concentrated under reduced pressure and diluted with 5 mL of water. The pH was adjusted to ca. 6-7 by addition of 3M hydrochloric acid. The precipitate was collected by filtration to give 0.054 g of 4-(3-chloro-phenyl)-2-[6-(4-morpholin-4-yl-butyl)-benzoimidazol-1-yl]-thiazole-5-carboxylic acid (I.41 g) as a white solid.

1. concentrationconcentrated under reduced pressure
2. additiondiluted with 5 mL of water
3. additionThe pH was adjusted to ca. 6-7 by addition of 3M hydrochloric acid
4. filtrationThe precipitate was collected by filtration