Hydrazine hydrate (1:1) → HCID 67420203, compound

Participants

Reaction Steps

To a stirred solution of 1-benzyl-3-(2,4-bis-benzyloxy-5-chloro-benzoyl)-piperidin-4-one (26.1 g, 48 mmol) in EtOH (150 mL) and THF (100 mL) was slowly added drop wise a solution of hydrazine hydrate (10 mL, 200 mmol, 4 eq) in EtOH (25 mL). After stirring overnight, the solution was diluted with ethylacetate and thoroughly washed with water, then with brine, dried over Na2SO4 and evaporated. The residue was chromatographed on silica gel eluting with ethylacetate to give 5-benzyl-3-(2,4-bis-benzyloxy-5-chloro-phenyl)-4,5,6,7-tetrahydro-1H-pyrazolo[4,3-c]pyridine (a) (22.5 g, 86% yield).

Provenance & Evidence