Piperidine → HCID 69797481, compound

Participants

Reaction Steps

The process is performed as in Example 75, starting with 8.5 g of 2-chloro-N-(6,7-difluoro-1H-indazol-3-yl)acetamide, 200 cm3 of acetonitrile and 8.8 cm3 of piperidine. The reaction medium is refluxed for 1 hour, the precipitate formed is then filtered off on a sinter funnel and the crystals are taken up in 200 cm3 of ethyl acetate and 100 cm3 of water. The organic phase is separated out after settling of the phases has taken place, dried over magnesium sulphate, filtered and concentrated to dryness under reduced pressure (2 kPa; 50° C.). The crude product is purified by chromatography under an argon pressure of 50 kPa, on a column of silica gel (particle size 40-60 μm; diameter 3.5 cm), eluting with ethyl acetate. The fractions containing the expected product are combined and evaporated under reduced pressure (2 kPa; 50° C.); the residue is recristallized from a mixture of 50 cm3 of cyclohexane and 16 cm3 of ethyl acetate, filtered off and dried (90 Pa; 45° C.) to give 3.2 g of N-(6,7-difluoro-1H-indazol-3-yl)-1-piperidineacetamide in the form of white crystals melting at 158° C.

Provenance & Evidence