2-Benzothiazolinone, hydrazone → 2-[5-(4-Fluorophenyl)-3-(1-methylethyl)-1H-pyrazol-1-yl]benzothiazole

Participants

Reaction Steps

To a solution of the 1,3-diketone (103 g, 495 mmol) (preparation described in Example 1, Step A) in glacial acetic acid (800 mL) was added 2-hydrazinobenzothiazole (85.8 g, 520 mmol). The resulting solution was refluxed for 2.5 hours and then cooled to room temperature overnight. The resulting precipitate was collected, washed with water and dried overnight to give 154 g (92%) of a cream colored solid.

Provenance & Evidence