Triethylamine → N-benzyl-N'-naphthalen-2-yl-hydrazinecarboxylic acid tert-butyl ester

Participants

Reaction Conditions

Reaction Steps

A mixture of N-benzyl-hydrazinecarboxylic acid tert-butyl ester (Intermediate 27; 1.21 g, 5.44 mmol), 2-naphthaleneboronic acid (Lancaster; 1.00 g, 5.8 mmol), copper(II) acetate (990 mg, 5.45 mmol) and triethylamine (1.9 mL, 13.6 mmol) in 1,2-dichloroethane (30 mL) was heated in an oil bath at 50° C. for 1.5 h. The mixture was allowed to cool, and it was then adsorbed onto silica gel and purified by chromatography using an ISCO 120 g column, eluting with 15-30% ethyl acetate/hexanes, to give N-benzyl-N′-naphthalen-2-yl-hydrazinecarboxylic acid tert-butyl ester (929 mg, 49%) as a yellow oil that solidified on standing.

Provenance & Evidence