Cesium carbonate → Tert-butyl 4-(2-chloro-5-cyano-3-((7-cyano-4-(cyclopropyl(4-methoxybenzyl)amino)imidazo[2,1-f][1,2,4]triazin-2-yl)amino)benzyl)piperazine-1-carboxylate

Participants

Reaction Conditions

Reaction Steps

A mixture of tert-butyl 4-(3-amino-2-chloro-5-cyanobenzyl)piperazine-1-carboxylate (28 mg, 0.079 mmol), 2-chloro-4-(cyclopropyl(4-methoxybenzyl)amino)imidazo[2,1-f][1,2,4]triazine-7-carbonitrile (Intermediate 9)(28 mg, 0.079 mmol), Cs2CO3 (51.4 mg, 0.158 mmol), DPPF (4.4 mg, 7.9 μmol), 4,5-bis(diphenylphosphino)-9,9-dimethyxanthene (4.6 mg, 7.9 μmol), and in a microwave vial was flushed with nitrogen. Dioxane (0.7 mL) was added and the vial was sealed and heated at 100° C. for 3 hr. The reaction was diluted with EtOAc and filtered through celite. The solvent was removed and radial silica gel chromatography with hexane containing 5 to 40% EtOAc afforded tert-butyl 4-(2-chloro-5-cyano-3-((7-cyano-4-(cyclopropyl(4-methoxybenzyl)amino)imidazo[2,1-f][1,2,4]triazin-2-yl)amino)benzyl)piperazine-1-carboxylate (22 mg) as an oil.

Provenance & Evidence