Sodium Hydroxide → 5-{[2-(4-Carboxyphenyl)ethyl][2-(2-{[3-chloro-4'-(trifluoromethyl)biphenyl-4-yl]methoxy}-phenyl)ethyl]amino}-5,6,7,8-tetrahydroquinoline-2-carboxylic acid

Participants

Reaction Steps

42 g (54.46 mmol) of ethyl 5-([2-(2-{[3-chloro-4′-(trifluoromethyl)biphenyl-4-yl]methoxy}-phenyl)ethyl]{2-[4-(methoxycarbonyl)phenyl]ethyl}amino)-5,6,7,8-tetrahydroquinoline-2-carboxylate (Enantiomer 2, Example 92A) were dissolved in 429 ml of dioxane, 163 ml of 1 N aqueous sodium hydroxide solution were added and the mixture was then stirred at room temperature overnight. After the reaction had gone to completion, the dioxane was removed on a rotary evaporator and the mixture that remained was diluted with about 750 ml of water. The mixture was then acidified to pH 4-5 using acetic acid. The precipitated solid was filtered off with suction and washed repeatedly with water (about 250 ml of water in total). The solid was then taken up in 750 ml of water and stirred at room temperature overnight. After another filtration with suction, the solid was again washed with water and then dried under high vacuum overnight using the drying agent phosphorus pentoxide. The drying agent was then removed and the solid was dried at 40° C. for a further 24 h. In this manner, 35 g (48 mmol, 88% of theory) of the title compound were obtained.

Provenance & Evidence