1,1'-Carbonyldiimidazole → 4-Cyano-4'-[[(3-ethoxycarbonylpiperidino)carbonyl]methyloxy]biphenyl

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Reaction Steps

5.35 g of carbonyldiimidazole are added to a solution of 7.6 g of 4-(carboxymethyloxy)-4'-cyano-biphenyl (prepared from 4-cyano-4'-hydroxy-biphenyl and tert.butyl bromoacetate according to Example 13, but with potassium tert.butoxide as base, and subsequent ester cleaving with trifluoroacetic acid) in 30 ml of tetrahydrofuran and the resulting mixture is stirred for 0.5 hours at ambient temperature. 5.1 ml of ethyl piperidine-3-carboxylate are added and the mixture is stirred for 22 hours at ambient temperature. The tetrahydrofuran is evaporated off, the residue is taken up in ethyl acetate and washed successively with saturated sodium bicarbonate solution, 0.1N hydrochloric acid and water. After evaporation of the organic phase the residue remains as an oil.

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