1,2-Dimethoxyethane → 4-[2-Benzyloxycarbonyl-2-(4-isobutyl-phenyl)-vinyl]-benzoic acid methyl ester

Participants

Reaction Conditions

Reaction Steps

4-(2-Benzyloxycarbonyl-2-bromo-vinyl)-benzoic acid methyl ester (2.0 g, 5.33 mmol) was added to a 100 mL RB flask containing 4-isobutylphenylboronic acid (2.85 g, 15.99 mmol), sodium carbonate (2.83 g, 26.65 mmol), and dichlorobis(tri-o-tolylphosphine)palladium(II) (544 mg, 0.69 mmol). Dimethoxyethane (16 mL), ethanol (8 mL), and water (4 mL) were added, and the reaction was stirred at 120° C. for 1 hour at which point TLC analysis indicated that the reaction had gone to completion. The reaction was filtered hot through celite and concentrated to dryness. Purification by flash column chromatography was performed on an ISCO Sg-100c system, using a 40 gram pre-packed column and eluting with a linear gradient of ethyl acetate in hexanes starting at 10% EtOAc and ending at 40% EtOAc over 22 minutes. This afforded the desired product, 4-[2-Benzyloxycarbonyl-2-(4-isobutyl-phenyl)-vinyl]-benzoic acid methyl ester as a pale oil, 1.8 g, 79%. LC-MS m/z=429 [C28H28O4+H]+.

Provenance & Evidence