1,2-Dibromoethane → 6-(3-Methoxy-phenyl)-7-pyridin-4-yl-2,3-dihydro-pyrazolo[5,1-b]thiazole

Beteiligte Stoffe

Reaktionsschritte

5-(3-Methoxy-phenyl)-4-pyridin-4-yl-2H-pyrazole-3-thiol (630 mg, 2.22 mmol) was dissolved in dry DMF (22 mL) under nitrogen atmosphere. Solid potassium carbonate (1.5 g, 11.1 mmol, 5 eq) was added followed by 1,2-dibromoethane (0.192 mL, 2.22 mmol, 1 eq) and the suspension was stirred at room temperature overnight. The reaction mixture was then concentrated under reduced pressure, diluted with ethyl acetate and washed with saturated aqueous NaHCO3 and brine. The organic layer was dried over Na2SO4 and concentrated to dryness to give 420 mg (61% over two steps) of crude 6-(3-methoxy-phenyl)-7-pyridin-4-yl-2,3-dihydro-pyrazolo[5,1-b]thiazole which was used without further purification in the following step.

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