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Sodium hydride, 60% dispersion in mineral oil (0.10 g, 2.5 mmol) is added in portions over 10 minutes to a stirred solution of diethyl cyanomethylphosphonate (0.44 g, 2.5 mmol) in tetrahydrofuran (10 ml) cooled in ice. The mixture is stirred for 15 minutes then a solution of 7-indole carboxaldehyde (0.30 g, 2.1 mmol) in tetrahydrofuran (2 ml) is added dropwise. The mixture is stirred for 30 minutes, diluted with ethyl acetate, washed with water, dried and evaporated. The residue is chromatographed on silica in ethyl acetate-hexane (1:3) to give the product.

1. temperaturecooled in ice
2. stirringThe mixture is stirred for 30 minutes
3. washwashed with water
4. customdried
5. customevaporated
6. customThe residue is chromatographed on silica in ethyl acetate-hexane (1:3)
7. customto give the product