Cesium carbonate → HCID 24822921, compound

Participants

Reaction Steps

In a dry 25 mL round bottom flask, 7-(2-chloro-5-methoxy-phenyl)-5-methyl-benzo[1,2,4]triazin-3-ylamine (0.132 g, 0.44 mmol, 1 equiv), 4-(4-bromo-benzenesulfonyl)-piperidine-1-carboxylic acid benzyl ester (0.232 g, 0.529 mmol, 1.2 equiv), Cesium carbonate (0.432 g, 1.33 mmol, 3 equiv), 4,5-bis(diphenylphosphino)-9,9-dimethyl xanthene (0.051 g, 0.088 mmol, 0.2 equiv) and tris(dibenzylideneacetone) dipalladium (0.040 g, 0.044 mmol, 0.1 equiv) were combined. The reactants were flushed with argon, diluted with dioxane (12 mL) and outfitted with a reflux condenser. The reaction was heated to reflux for 18 hours, then cooled to room temperature and slowly diluted with water. The resulting precipitate was collected and dried yielding a yellow powder (0.271 g, 93% yield). MS (ESI+): m/z=658.2, LC retention time: 3.41 min.

Provenance & Evidence