Lithium hydroxide, monohydrate → 7-(Benzyloxycarbonylamino)-4-(2-fluorophenyl)-9H-pyrido[3,4-b]indole-1-carboxylic acid

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Reaction Steps

To a solution of ethyl 7-(benzyloxycarbonylamino)-4-(2-fluorophenyl)-9H-pyrido[3,4-b]indole-1-carboxylate (0.238 g, 0.492 mmol) in tetrahydrofuran (12 mL) and methanol (4 mL) at room temperature was added a solution of lithium hydroxide hydrate (0.083 g, 1.969 mmol) in water (1.8 mL). The mixture was stirred at room temperature for 1 hr, and then concentrated under vacuum. To the residue was added water (5 ml), and the mixture was acidified to pH 5 with 1 N HCl. The precipitating product (0.214 g, 0.470 mmol, 95% yield) was collected by suction filtration and dried over Drierite under vacuum.

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