1-(4-bromophenyl)ethylhydrazine

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: To a solution of 4-oxo-3-propionyl-hexanoic acid ethyl ester (500 mg) (preparation analagous to that of 1,1-dimethylethyl 4-oxo-3-propanoylhexanoate in WO2007/141267) in methanol (20 ml) at room temperature was added [1-(4-bromo-phenyl)-ethyl]-hydrazine (0.75 g). After overnight stirring, water was added and the mixture extracted 3 times with ethyl acetate. The organic layer was separated; washed with water and brine solution, then dried and concentrated to afford 792 mg of the title compound. Retention time HPLC: 1.58 min (Method D), ESI mass spectrum: (Br) [M]+=393/395. the mixture extracted 3 times with ethyl acetate The organic layer was separated washed with water and brine solution dried concentrated