反应详情

Tributyltin methoxide (28.3 ml, 98 mmol), methyl (3-bromophenyl)acetate (WO 95/27692, pg. 16, e.g. 5a) (15.0 g, 65.0 mmol), isopropenyl acetate (10.8 ml, 98.0 mmol), palladium(II)acetate (750 mg, 3.30 mmol) and tri-ortho-tolylphosphine (2.0 g, 6.5 mmol) were stirred together in toluene (75 ml) at 100° C. under nitrogen for 5 hours. After cooling the reaction was diluted with ethyl acetate (150 ml) and 4M aqueous potassium fluoride solution (90 ml) and stirred for 15 minutes. The mixture was filtered through Arbocel® and the organic phase separated and concentrated in vacuo. The residue was purified column chromatography on silica gel eluting with diethyl ether:pentane (0:100 to 25:75 and then changing to dichloromethane), to yield the title compound as a pale yellow oil, 12.6 g.

1. temperatureAfter cooling the reaction
2. filtrationThe mixture was filtered through Arbocel®
3. customthe organic phase separated
4. concentrationconcentrated in vacuo
5. customThe residue was purified column chromatography on silica gel eluting with diethyl ether:pentane (0:100 to 25:75