Sulfuric Acid → HCID 22397358, compound

Participants

Reaction Steps

A stirred mixture of 4-[1-(4-fluorophenyl)-1H-indazol-3-yl]piperidine-1-carbonitrile of Example 102 (30 g, 0.094 moles) and 25% H2SO4 (225 ml) was refluxed for 20 hours. The mixture was cooled, poured into H2O, and basified with a 25% NaOH solution. The product was extracted (dichloromethane), dried (MgSO4), and concentrated to yield 21 g (76%) of 1-(4-fluorophenyl)-3-(4-piperidinyl)-1H-indazole as an oil. To a stirred suspension of the indazole (4.0 g, 0.0135 moles) in toluene (70 ml) was added dropwise methyl isothiocyanate (1.5 ml, 0.022 moles). The mixture was stirred for 23 hours at ambient temperature during which time the product precipitated from the solution. The product was collected and recrystallized twice from isopropyl alcohol to yield 2.74 g (55%) of N-methyl-4-[1-(4-fluorophenyl)-1H-indazol-3-yl]piperidine-1-carbothioamide, m.p. 179°-181°C.

Provenance & Evidence