Lithium Hydroxide → 4-(3-Chloro-phenyl)-2-[6-(4-methyl-piperazin-1-ylmethyl)-benzoimidazol-1-yl]-thiazole-5-carboxylic acid

Beteiligte Stoffe

Reaktionsschritte

To a solution of 0.250 g (0.5 mmole) of 4-(3-chloro-phenyl)-2-[6-(4-methyl-piperazin-1-ylmethyl)-benzoimidazol-1-yl]-thiazole-5-carboxylic acid ethyl ester (I.2d) in 10 mL of tetrahydrofuran and 10 mL of water was added 0.12 g (5 mmole) of lithium hydroxide. The mixture was stirred at ambient temperature for 1 hour. The mixture was concentrated under reduced pressure, 40 mL of water was added and the pH adjusted to 6-7 by the addition of 1M hydrochloric acid. The precipitate was collected by filtration to give 0.145 g of 4-(3-chloro-phenyl)-2-[6-(4-methyl-piperazin-1-ylmethyl)-benzoimidazol-1-yl]-thiazole-5 carboxylic acid (I.2f) as a white solid.

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