2,2,2-Trifluoroethanol → 5-{9-Chloro-6-[1-(2,2,2-trifluoroethoxy)propyl]-3,4-dihydropyrimido[1,2-a]benzimidazol-1(2H)-yl}-N,N,6-trimethylpyridin-2-amine

Participants

Reaction Steps

A mixture of 1-{9-chloro-1-[6-(dimethylamino)-2-methylpyridin-3-yl]-1,2,3,4-tetrahydropyrimido[1,2-a]benzimidazol-6-yl}propan-1-ol (71.1 mg, 0.178 mmol), 1,1′-(azodicarbonyl)dipiperidine (89.7 mg, 0.355 mmol) and n-butylphosphine (71.8 mg, 0.355 mmol) in tetrahydrofuran (2.0 mL) was stirred at room temperature for 15 min. 2,2,2-Trifluoroethanol (178 mg, 1.78 mmol) was added to the mixture, and the mixture was stirred at 60° C. for 7 hr. The mixture was concentrated in vacuo, and the residue was purified by flash column chromatography on silica gel eluting with a 35-80% ethyl acetate/n-hexane gradient mixture. The filtrate was concentrated in vacuo to give the solid, which was recrystallized from ethyl acetate/diisopropyl ether to give the title compound as a colorless crystal (30.8 mg, 0.0639 mmol, 36%)

Provenance & Evidence