Hydrochloric Acid → HCID 20145095, compound

Participants

Reaction Steps

Trifluoroacetic acid (2.8 g) was dropwise added to a suspension of 2-methylamino-4-carbamoyl-5-(4-pyridyl)thiazole (2.1 g) and pyridine (2.8 g) in methylene chloride (60 ml) at 5° to 10° C. with stirring, which was continued under the same condition for 6 hours. The reaction mixture was poured into ice-water and the resultant mixture was acidified to pH 1.0 with 10% hydrochloric acid. The separated aqueous layer was adjusted to pH 7.5 with 20% potassium carbonate and extracted with ethyl acetate. The organic extract was washed with brine and dried over magnesium sulfate. The solvent was removed in vacuo to give a crystalline residue, which was recrystallized from a mixture of ethyl acetate and tetrahydrofuran to afford 4-cyano-2-methylamino-5-(4-pyridyl)thiazole (0.5 g). mp 192°-195° C.

Provenance & Evidence