Water → 1-Bromo-4-(methoxymethoxy)benzene

Participants

Reaction Steps

In DMF (255 ml) was dissolved 4-bromophenol (51.0 g). To the mixture was added at room temperature potassium carbonate (81.5 g) and then was added dropwise chloromethylmethyl ether (44.8 ml), and the mixture was stirred for 2 hours. The reaction mixture was added to water, and the mixture was extracted with ethyl acetate, washed with saturated brine and dried with magnesium sulfate. Under reduced pressure, the solvent was evaporated, and the residue was purified with silica gel column chromatography (hexane/ethyl acetate=8/1) to give 1-bromo-4-(methoxymethoxy)benzene (61.4 g). In ether (240 ml) was dissolved 1-bromo-4-(methoxymethoxy)benzene (30 g). To the mixture was added dropwise at −78° C. 1.6M n-butyllithium/hexane (90.7 ml), and the mixture was stirred for 1 hour. To the mixture was added dropwise a solution of trimethyl borate (43.1 g) in THF (43 ml), and the mixture was stirred for 30 minutes and warmed to room temperature. To the mixture was added water (150 ml), and the mixture was stirred for 15 minutes. The reaction mixture was extracted with ethyl acetate. Under reduced pressure, the solvent was evaporated, and the residue was stirred in methanol/water (2/1, 1000 ml) for 3 days. Under reduced pressure, methanol was removed, and the residue was extracted with ethyl acetate, washed with saturated brine and dried with magnesium sulfate. Under reduced pressure, the solvent was evaporated, and the residue was washed with hexane/isopropylether to give 4-(methoxymethoxy)phenyl borate (2.4 g). 1H-NMR (200 MHz, CDCl3) δ 3.51 (3H, s), 5.26 (2H, s), 7.14 (2H, d, J=8.4 Hz), 8.15 (2H, d, J=8.4 Hz).

Provenance & Evidence