Water → (+/-)-Acetic acid (2RS,4aRS,10bRS)-6-(4-butoxy-phenyl)-8,9-dimethoxy-1,2,3,4,4a,10b-hexahydrophenanthridin-2-yl ester

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1670 mg of phosphorous pentachloride are suspended in 2.5 ml of dichloromethane. 1119 mg of (±)-acetic acid (1RS,3RS,4RS)-4-{[1-(4-butoxy-phenyl)-methanoyl]-amino}-3-(3,4dimethoxy-phenyl)-cyclohexyl ester (compound A7) dissolved in 15 ml of dichloromethane are added and the mixture stirred for 18 h. The mixture is cooled to 0° C. and 10 ml of triethylamine added, then 5 ml of water. After phase separation and removal of solvent the solid residue is purified by flash chromatography [silica, toluene/dioxane=2:1 (containing 0.5% of ammonia)] to give 940 mg of the title compound as a colorless foam (87% of theory).

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