Allyltributylstannane → 4-Allylnaphthalene-1-carboxylic acid methyl ester

Participants

Reaction Conditions

Reaction Steps

To a solution of 4-bromo-naphthalene-1-carboxylic acid methyl ester (2.0 g, 7.9 mmol) in toluene (20 mL) was added allyltributyltin (2.7 mL), tetrakis(triphenylphosphine)palladium(0) (183 mg, 0.16 mmol) and 2 crystals of BHT. The system was purged under vacuum and nitrogen and allowed to heat to 120° C. under N2 for 4 h. TLC analysis (silica, 1:1 ethyl acetate-hexanes) showed the reaction to be completed with only one new fluorescent spot present. The mixture was diluted with ether, washed with H2O, 10% HCl, and then saturated sodium bicarbonate, dried over magnesium sulfate, filtered, and concentrated under reduced pressure. The crude product was purified by flash chromatography (SiO2, 9:1 hexanes-ether) to give (1.6 g, 89%) 4-allylnaphthalene-1-carboxylic acid methyl ester as a colorless liquid. MS m/z 227.1 (M+1). 1H NMR (400 mHz) CDCl3 8.95(d 1H), 8.11(d, 1H), 8.08(d, 1H), 7.58(m, 2H), 7.37(d, 1H), 6.09(m, 1H), 5.11(m, 2H), 3.99(s, 3H), 3.88(d, 2H).

Provenance & Evidence