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A mixture of 200 mg 6-(3,5-dichloro-phenylsulphonylamino)-naphthalene-1-carboxylic acid-benzylamide, 180 mg diethylphosphonomethyltriflate (prepared analogously to Tetrahedron Letters 1986, 27, 1477) and 100 mg potassium carbonate in 4 ml N,N-dimethylformamide is stirred for three hours at ambient temperature. Then it is combined with ethyl acetate, washed with water and saturated sodium chloride solution, dried on magnesium sulphate and evaporated down. The flask residue is chromatographed through a silica gel column with cyclohexane/ethyl acetate (40:60 to 0:100) as eluant.

1. washwashed with water and saturated sodium chloride solution
2. customdried on magnesium sulphate
3. customevaporated down
4. customThe flask residue is chromatographed through a silica gel column with cyclohexane/ethyl acetate (40:60 to 0:100) as eluant