Cesium carbonate → HCID 58446983, compound

Participants

Reaction Steps

A 100 mL round bottom flask was charged with tert-butyl 4-(6-bromo-[1,2,4]triazolo[4,3-a]pyrazin-8-yl)piperazine-1-carboxylate (1.0 g, 2.6 mmol), thiophen-3-ylboronic acid (0.50 g, 3.9 mmol), Pd(PPh3)4 (0.30 g, 0.26 mmol), Cs2CO3 (1.27 g, 3.9 mmol), 1,4-dioxane (25 mL) and water (25 mL). The resulting mixture was refluxed under N2 overnight. Reaction progress was monitored by TLC (EtOAc/petroleum ether=1:2). Work-up: the reaction mixture was extracted with EtOAc (50 mL). The organic solution was washed with brine (40 mL), dried over anhydrous Na2SO4 and concentrated in vacuo. The residue was further purified by flash column chromatography on silica gel with 10% EtOAc in petroleum ether, to afford 1.0 g (99%) of the product as a yellow solid.

Provenance & Evidence