Borane → 4-(2-Aminomethyl-3-benzylamino-6-fluoro-phenyl)-piperazine-1-carboxylic acid tert-butyl ester

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Reaction Steps

To 288 mg (0.7 mmol) of 4-(3-benzylamino-2-cyano-6-fluoro-phenyl)-piperazine-1-carboxylic acid tert-butyl ester dissolved in 7 mL tetrahydrofuran was added 1.4 mL (2 eq., 1.4 mmol, 1M in tetrahydrofuran) borane. The mixture was refluxed 10 hours and quenched with methanol, partitioned between ethyl acetate and water, dried over magnesium sulfate and concentrated to yield crude 4-(2-aminomethyl-3-benzylamino-6-fluoro-phenyl)-piperazine-1-carboxylic acid tert-butyl ester, which was used directly in the following step.

Provenance & Evidence