Acetic Acid → HCID 86759301, compound

Participants

Reaction Conditions

Reaction Steps

A mixture of 3-[4-amino-3-(4-phenoxyphenyl)-1H-pyrazolo[3,4-d]pyrimidin-1-yl]-1-cyclobutanone (0.300 g, 0.00081 mol), N-methylpiperazine (0.243 g, 0.00242 mol) and acetic acid (0.146 g, 0.00242 mol) in 1,2-dichloroethane (20 ml) was stirred for twenty min at 40° C. and sodium triacetoxyborohydride (0.223 g, 0.00105 mol) was added in three portions over one hour. The mixture was stirred for eighteen hours at 40° C. The solvent was removed under reduced pressure and the residue partitioned between aqueous saturated sodium bicarbonate solution (30 ml) and chloroform (15 ml). The organic layer was separated and the aqueous layer was further extracted with chloroform three times (15 ml each). The combined organic extracts were dried over magnesium sulfate and the solvent removed under reduced pressure to yield yellow oil that was purified by flash chromatography on silica gel using dichloromethane/methanol (97:3) as a mobile phase. The solvent was removed in vacuo and the residue (0.120 g, 0.000263 mol) was dissolved in absolute ethanol (10 mL). A solution of maleic acid (0.122 g, 0.001053 mol) in absolute ethanol (5 mL) was added and the mixture was stirred at reflux for fifteen minutes. The solution was cooled to room temperature and the precipitate was filtered, washing with absolute ethanol (3×5 mL). The solvent was removed in vacuo to give 1-{3-[4-amino-3-(4-phenoxyphenyl)-1H-pyrazolo[3,4-d]pyrimidin-1-yl]cyclobutyl}-4-methylhexahydropyrazinediium dimaleate (0.181 g, 0.000397 mmol) as a white solid.

Provenance & Evidence