Hydrochloric Acid → HCID 15952760, compound

Participants

Reaction Steps

Freshly prepared cyclopropyl magnesium bromide (as described in J. Am. Chem. Soc. (2002), 124, 13856-63; with cyclopropylbromide (48 mg, 0.4 mmol, 1.2 eq) and magnesium powder (10 mg) in 5 ml of THF) is added slowly and dropwise to a mixture of 1-{[6-chloro-2-(trifluoromethyl)imidazo[1,2-b]pyridazin-3-yl]methyl}-4-propylpyrrolidin-2-one 30 (120 mg, 0.33 mmol) and iron (III) acetylacetone (3 mg, 0.0165 mmol, 0.05 eq) in THF (5 ml) at room temperature. The reaction is kept at room temperature for 16 h, then hydrolyzed (10 ml of 1 N HCl), neutralized with a saturated solution of NaHCO3 until alkaline pH. The crude product is extracted with ethyl acetate (3×20 ml). The cumulated organic layers are dried over MgSO4, filtered and condensed under reduced pressure. The residue is purified by preparative chromatography (CH2Cl2/MeOH/NH4OH: 98/2/0.2 (v/v/v)) to afford 1-{[6-cyclopropyl-2-(trifluoromethyl)imidazo[1,2-b]pyridazin-3-yl]methyl}-4-propylpyrrolidin-2-one 40.

Provenance & Evidence