Lawesson's reagent → 3-Methyl-1-(2-pyridinyl)-1,9-dihydro-4H-pyrazolo[3,4-b]quinolin-4-thione

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Reaction Steps

A solution of 3-methyl-1-(2-pyridinyl)-1,9-dihydro-4H-pyrazolo[3,4-b]quinolin-4-one (13.94 g, 50.5 mmol) and Lawesson's Reagent (12.5 g, 30.9 mmol) in toluene (750 mL) was heated under reflux for 1 hour. The solution was cooled to room temperature, and the resulting crude crystals were collected by filtration. The crystals were recrystallized from ethyl acetate to give the title compound (13.11 g, 89% yield).

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