Water → (3beta,5beta,7alpha,12alpha)-3-(9H-Fluoren-9-ylmethoxy)amino-7,12-dihydroxycholan-24-oic acid

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Reaction Conditions

Reaction Steps

A solution of 9-fluorenylmethoxycarbonyl chloride (1.4 g; 5.4 mmol) in 1,4-dioxane (18 mL) was added dropwise to a suspension of (3β,5β,7α,12α)-3-amino-7,12-dihydroxycholan-24-oic acid A (2.0 g; 4.9 mmol) (3) in 10% aq. Na2CO3 (30 mL) and 1,4-dioxane (18 mL) stirred at 0° C. After 6 h stirring at room temperature H2O (100 mL) was added, the aqueous phase washed with Et2O (2×90 mL) and then 2 M HCl (15 mL) was added (final pH: 1.5). The precipitated solid was filtered, washed with H2O (3×100 mL), vacuum dried and then purified by flash chromatography to give B as a white solid (2.2 g; 3.5 mmol). Yield 71%.

Provenance & Evidence