Acetic Acid → HCID 178480994, compound

Participants

Reaction Steps

A mixture of 4-[4-amino-3-(6-phenoxy-3-pyridyl)-1H-pyrazolo[3,4-d]pyrimidin-1-yl]-1-cyclo-hexanone (Intermediate Al) (0.90 g, 0.0022 mol), N-methylpiperazine (0.676 g, 0.0067 mol) and acetic acid (0.405 g, 0.0067 mol) in 1,2-dichloroethane (40 mL) was stirred for 10 min and sodium triacetoxyborohydride (0.62 g, 0.0029 mol) was added at once. The mixture was stirred at ambient temperature under an atmosphere of nitrogen for 24 hours and sodium triacetoxyborohydride (0.30 g, 0.0014 mol) was added. The mixture was stirred for another 48 hours, the solvent removed under reduced pressure and the residue partitioned between saturated aqueous sodium bicarbonate solution (80 mL) and dichloromethane (50 mL). The organic layer was separated and the aqueous layer further extracted with dichloromethane twice (50 mL). The combined organic extracts were dried over magnesium sulfate and the solvent removed under reduced pressure to yield a yellow oil. The compound was further purified by flash chromatography on silica gel using dichloromethane/triethylamine/methanol (89:10:1) as a mobile phase to yield cis-1-[4-(4-methylpiperazino)cyclohexyl]-3-(6-phenoxy-3-pyridyl)-1H-pyrazolo[3,4-d]pyrimidin-4-amine (Intermediate AJ): TLC (dichloromethane/triethylamine 9:1) Rf 0.29 and trans-1-[4-(4-methylpiperazino)cyclohexyl]-3-(6-phenoxy-3-pyridyl)-1H-pyrazolo[3,4-d]pyrimidin-4-amine: TLC (dichloromethane/triethylamine=9:1) Rf 0.14.

Provenance & Evidence