3-Acetylpyridine → 1-(3-Pyridyl)-3-(dimethylamino)-2-propen-1-one

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Reaction Steps

Reactant 3 can be obtained by the following procedures. A mixture of 3-acetylpyridine (2.47 mol) and N,N-dimethylformamide dimethylacetal (240 mL) is heated at reflux for 16 h. The solvent is removed in vacuo and hexanes (100 mL) is added to the residue to crystallize a solid. The solid is recrystallized from methylene chloride-hexanes to give 3-dimethylamino-1-(3-pyridyl)-2-propen-1-one. 1H NMR (400 MHz, d-chloroform) δ 9.08 (d, J=2.4 Hz, 1H), 8.66 (m, 1H), 8.20 (m, 1H), 7.87 (m, 1H), 7.37 (m, 1H), 5.68 (d, J=16.4 Hz, 1H), 3.18 (s, 3H), 2.97 (s, 3H).

Provenance & Evidence