Lithium hydroxide, monohydrate → rac-5-{(2-{2-[(4-tert-Butylbenzyl)oxy]phenyl}ethyl)[2-(4-carboxyphenyl)ethyl]amino}-5,6,7,8-tetrahydroquinoline-2-carboxylic acid

Participants

Reaction Conditions

Reaction Steps

35 mg (0.05 mmol) of ethyl 5-[(2-{2-[(4-tert-butylbenzyl)oxy]phenyl}ethyl){2-[4-(methoxycarbo-nyl)phenyl]ethyl}amino]-5,6,7,8-tetrahydroquinoline-2-carboxylate (Example 43A) were taken up in 1 ml of THF and 1 ml of water, and 7 mg (0.16 mmol) of lithium hydroxide monohydrate were added. The reaction was stirred at 50° C. overnight. After the reaction had gone to completion, the THF was removed on a rotary evaporator and the mixture that remained was diluted with water. The mixture was then acidified with 1 M hydrochloric acid and extracted repeatedly using a 1:1 mixture of ethyl acetate and dichloromethane. The combined organic phases were dried over magnesium sulphate, filtered and concentrated to dryness. This gave 29 mg (0.04 mmol, content 91%, 81% of theory) of the title compound as a yellowish solid.

Provenance & Evidence