1-Bromo-4-methyl-2-pentanone → 1-(5-Bromo-4-(4-isobutylthiazol-2-yl)pyridin-2-yl)-3-ethylurea

Participants

Reaction Conditions

Reaction Steps

In a 100 mL round-bottomed flask 5-bromo-2-(3-ethylureido)pyridine-4-carbothioamide (Intermediate 6, 0.95 g, 3.13 mmol) and 1-bromo-4-methylpentan-2-one (0.561 g, 3.13 mmol, Chem. Pharm. Bull., 2001, 49(8), 988-998) were mixed in EtOH (10 mL) to give a yellow suspension. The reaction mixture was heated to 80° C. for 3 h. The reaction mixture was cooled to room temperature, and concentrated under reduced pressure. ACN was added, and the residue solid was azeotroped with ACN (3×). The crude mass obtained, 1.02 g, was taken forward without purification.

Provenance & Evidence