Diethyl Malonate → Diethyl 2-(2-bromo-6-chlorobenzyl)malonate

Participants

Reaction Conditions

Reaction Steps

Diethyl malonate (8.33 mL, 54.59 mmol) was added dropwise to sodium hydride (60% oil dispersion) (2.28 g, 56.97 mmol) in DMF (55 mL) at 0° C. The mixture was stirred for 5 min at ambient temp, wherafter 1-bromo-2-(bromomethyl)-3-chlorobenzene (13.5 g, 47.5 mmol) dissolved in DMF (15 mL) was added dropwise at 0° C. The mixture was stirred at 0° C. for 20 min and ambient temp overnight. NH4Cl (aq) was added to quench the reaction. Diethyl ether was added followed by water. The phases were separated and the aqueous phase was extracted with diethyl ether. The combined organic phases were washed with brine and dried (MgSO4). The aqueous phase was extracted with dichloromethane. The organic phase was washed with brine. The solvents were evaporated to give 18.2 g (quantitative). 4 g of the crude material was dissolved in dichloromethane and purified by column chromatography eluting with gradients of ethyl acetate in heptanes. Fractions containing product were pooled and the solvents were evaporated to give the title compound. Yield: 3.32 g, 19%. 1H NMR (400 MHz, CDCl3) δ ppm 1.23 (t, 7H) 3.62 (d, 2H) 3.84 (m, 1H) 4.20 (q, 4H) 7.06 (t, 1H) 7.35 (dd, 1H) 7.50 (dd, 1H). MS (ES+) m/z 365 [M+H]+.

Provenance & Evidence