Triethylamine → N-cyclopropyl-N'-phenyl-hydrazinecarboxylic acid tert-butyl ester

Participants

Reaction Conditions

Reaction Steps

A mixture of N-cyclopropyl-hydrazinecarboxylic acid tert-butyl ester (Intermediate 28; 0.111 g, 0.64 mmol), phenylboronic acid (Aldrich; 156 mg, 1.3 mmol), copper(II) acetate (116 mg, 0.64 mmol) and triethylamine (180 μL, 1.3 mmol) in 1,2-dichloroethane (3 mL) was heated in an oil bath at 50° C. for 16 h. The mixture was allowed to cool, and it was then adsorbed onto silica gel and purified by chromatography using an ISCO 40 g column, eluting with 5-40% ethyl acetate/hexanes, to give N-cyclopropyl-N′-phenyl-hydrazinecarboxylic acid tert-butyl ester (72 mg, 45%) as a pale yellow solid.

Provenance & Evidence