Dimethylamine → (3aSR,10RS)-2-(2-Dimethylamino-ethyl)-6-ethoxy-10-(3-hydroxy-phenyl)-3a-methyl-3a,4,9,10-tetrahydro-2,9,10a-triaza-cyclopenta[b]fluorene-1,3-dione

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Reaction Steps

To a suspension of 200 mg (3aSR,10RS)-2-(2-Bromo-ethyl)-6-ethoxy-10-(3-hydroxy-phenyl)-3a-methyl-3a,4,9,10-tetrahydro-2,9,10a-triaza-cyclopenta[b]fluorene-1,3-dione (example 22) in 10 ml acetonitrile are added 200 μl of a 2 M solution of dimethyl amine in tetrahydrofurane and 85 mg sodium carbonate. The mixture is heated to reflux and additional 1 ml of the 2 m solution of dimethyl amine in THF are added. After additional 2 h heating to reflux, another 600 μl of the solution of dimethyl amine in THF are added. The mixture is heated to reflux for 15 h. Water is added and the mixture is extracted with ethyl acetate. The combined organic layers are washed with brine and dried with magnesium sulfate. After removal of the solvent under reduced pressure, the residue is triturated with diisopropyl ether. 82 mg (44%) of title compound are obtained as a colorless solid. MS: m/z (MH+)=463.2

Provenance & Evidence