Potassium Carbonate → HCID 20145030, compound

Participants

Reaction Steps

A solution of sulfuryl chloride (2.84 g) in methylene chloride (5 ml) was dropwise added to a solution of ethyl 4-(3-pyridyl)-2,4-dioxo-butyrate (4.42 g) in methylene chloride (40 ml) at 18° C. to 30° C. After being stirred at ambient temperature for one hour, the mixture was added to a solution of thiourea (4.56 g) in a mixture of tetrahydrofuran (50 ml) and water (10 ml). The resulting mixture was adjusted to pH 7.5 with 20% aqueous potassium carbonate and stirred for one hour, and then the solvent was removed in vacuo. To the residue was added a mixture of water and ethyl acetate, and the mixture was acidified to pH 1.0 with 10% hydrochloric acid. The separated aqueous layer was adjusted to pH 9.0 with 20% aqueous potassium carbonate and extracted with ethyl acetate. The extract was dried over magnesium sulfate and evaporated in vacuo. The residue was recrystallized from a mixture of ethyl acetate and tetrahydrofuran to give ethyl 2-amino-5-nicotinoyl-4-thiazolecarboxylate (0.9 g). mp 221° C. (dec.).

Provenance & Evidence