1-Methylpiperazine → HCID 178480760, compound

Participants

Reaction Steps

Tris(dibenzilideneacetone)dipalladium, Pd2(dba)3, (2.3 g, 2.5 mmol), 2-dicyclohexylphosphino-2′-(N,N-dimethylamino)-biphenyl (950 mg, 2.4 mmol), 8-[5-bromo-2-trifluoromethoxy-phenylamino]-4,5-dihydro-1H-pyrazolo[4,3-h]quinazoline-3-carboxamide (14.8 g, 31.54 mmol) in THF (160 mL) were charged in a round-bottom flask flushed with argon. The flask was evacuated and backfilled with argon. LiN(TMS)2 solution (1M in THF, 630 mL) and N-methylpiperazine (69 mL, 50.64 mmol) were added and the reaction mixture refluxed for 1 h. The reaction mixture was then allowed to cool to room temperature and filtered through a pad of celite. The organic phase was concentrated. The crude solid was purified by flash chromatography on silica gel (eluant: DCM/MeOH 95/5) to afford 9.2 g (60% yield) of the title compound.

Provenance & Evidence