Sodium Iodide → 3-[4-[1-(1-Phenyl-1H-indol-3-yl)-4-piperazinyl]butyl]2-methyl-1-thia-3-azaspiro[4.4]nonan-4-one dihydrochloride

Participants

Reaction Conditions

Reaction Steps

A mixture of 3-(4-bromobutyl)-2-methyl-1-thia-3-azaspiro[4.4]nonan-4-one (6.80 g), 1-(1-phenyl-1H-indol-3-yl) piperazine dihydrochloride (4.80 g), diisopropylethyl amine (8.16 g), K2CO3 (9.50 g), NaI (400 mg) and CH3CN (200 ml) was heated to 80° C. under nitrogen for 24 hours. The mixture was cooled and filtered, the inorganics were washed with dichlormethane, and the filtrate was concentrated under reduced pressure to a residue. The residue was diluted with 0.5 N NaOH (150 ml) and the aqueous mixture extracted with ether (3×100 ml). The combined ether extracts were washed successively with H2O (150 ml) and brine (150 ml), dried (Na2SO4), and concentrated in vacuo. The crude product was chromatographed on silica gel, eluting with a gradient of 5-10% methanol in dichlormethane. The fractions containing the desired product (Rf=0.42, 10% methanol in dichloromethane) were concentrated to afford 4.84 g of a viscous liquid. The salt of this amine was precipitated from ether by the addition of ethereal HCl. A 4.74 g portion of the salt was recrystallized from ethanol yielding 2.15 g of solid, m.p. 214-217° C.

Provenance & Evidence