Triethylamine → Methyl 3-(2-bromo-3,5-difluorophenyl)propanoate

Beteiligte Stoffe

Reaktionsbedingungen

Reaktionsschritte

A mixture of 1,2-dibromo-3,5-difluorobenzene (4.5 g), 3,3-dimethoxyprop-1-ene (5.1 mL), tetrabutylammonium chloride (4.6 g) and triethylamine (3.5 mL) in N,N-dimethylformamide (50 mL) is purged with nitrogen for 20 minutes. Palladium-(II)-acetate (111 mg) is added and the mixture heated for 16 hours at 90° C. After cooling the mixture is partitioned between aqueous HCl (1 M) and diethyl ether, the organic layer dried (Na2SO4), volatiles evaporated under reduced pressure and the residue purified by column chromatography (silica gel; hexane:ethyl acetate 98:2→80:20) to give the title compound (Yield 3.6 g).

Herkunft & Nachweise