Ethyl vinyl ether → 6-Acetyl-3-{1-(1,3-benzodioxol-5-yl)-2-[(2-methoxy-4-methylphenyl)sulfonamido]-2-oxoethyl}-1-methyl-1H-indole

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Reaction Steps

A mixture of 3-{1-(1,3-benzodioxol-5-yl)-2-[(2-methoxy-4-methylphenyl)sulfonamido]-2-oxoethyl}-6-bromo-1-methyl-1H-indole (from Example 85, 300 mg, 0.53 mmol), ethyl vinyl ether (0.063 ml), palladium(II)acetate (6 mg), tri-o-tolylphosphine (13 mg) and triethylamine (0.1 ml) in acetonitrile (5 ml) was heated at reflux for 18 hours under a nitrogen atmosphere. After cooling, the solvent was evaporated in vacuo and the residue was stirred with 2N hydrochloric acid (~6 ml) for 45 minutes. The mixture was twice extracted with ethyl acetate, and then washed with water, and brine. The organic layer was dried (magnesium sulphate) and the solvents were evaporated in vacuo. The residue was flash chromatographed using a gradient elution of a mixture of 90% hexane and 10% ethyl acetate, through to 40% hexane and 60% ethyl acetate, to give the title compound (80 mg).

Provenance & Evidence