1,3-Cyclohexanedione → ethyl 2-amino-5-oxo-4-phenyl-5,6,7,8-tetrahydro-4H-chromene-3-carboxylate

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Reaction Steps

To a solution of 1,3-cyclohexane dione (0.56 g, 5.0 mmole) in hot ethanol (10 ml) was added ethyl trans-α-cyanocinnamate (1.0 g, 5.0 mmole) and the mixture heated at reflux for 18 h. The mixture was cooled to room temperature, filtered and washed with ethanol to provide the desired product (1.30 g, 83%) as a white powder. 1H NMR (400 MHz; CDCl3) δ 7.29-7.0 (m, 5H); 6.2 (bs, 2H); 4.72 (s, 1H); 4.09-3.96 (m, 2H); 2.64-2.48 (m, 2H); 2.40-2.26 (m, 2H); 2.06-1.88 (m, 2H); 1.14 (t, 3H, J=7.4 Hz). LC MS shows MH+ at 314.

Provenance & Evidence