Cesium carbonate → (R)-tert-butyl 3-(3-(3-(pyridin-4-yl)-1-trityl-1H-indazol-5-yl)-1H-1,2,4-triazol-5-yl)piperidine-1-carboxylate

Participants

Reaction Steps

Stirred a mixture of (R)-tert-butyl 3-(3-(3-bromo-1-trityl-1H-indazol-5-yl)-1H-1,2,4-triazol-5-yl)piperidine-1-carboxylate (500 mg, 0.72 mmol), pyridine 4-boronic acid (150 mg, 1.22 mmol), PdCl2dppf (30 mg, 0.036 mmol) and Cesium carbonate (400 mg, 1.23 mmol) in dioxane (9 mL) and water (1 mL) at 100° C. in a microwave oven for 2 hours. After cooling, diluted with water (50 ml), then extracted with DCM (100 ml). The combined organic layer was dried (Na2SO4), filtered and evaporated to yield crude product, which chromatographed on silica gel eluting with 30% v/v EtOAc/Hexanes to yield (R)-tert-butyl 3-(3-(3-(pyridin-4-yl)-1-trityl-1H-indazol-5-yl)-1H-1,2,4-triazol-5-yl)piperidine-1-carboxylate as a white solid (430 mg).

Provenance & Evidence