Cesium carbonate → tert-butyl 7-(4-iodo-1H-pyrazol-1-yl)-2-azaspiro[3.5]nonane-2-carboxylate

Participants

Reaction Conditions

Reaction Steps

To a solution of 4-iodo-1H-pyrazole and tert-butyl 7-(methylsulfonyloxy)-2-azaspiro[3.5]nonane-2-carboxylate (70 mg, 0.219 mmol, 1.0 equiv) and 4-iodo-1H-pyrazole in DMF (1 mL) was added Cs2CO3 (79 mg, 0.241 mmol, 1.1 equiv). The mixture was stirred at 80° C. for 3 hrs. It was concentrated by rotary evaporator in vacuo to give the residue which was purified by CombiFlash (12 g silica gel column, EtOAc/Hex: 0-40%) to afford 74 mg (yield 81%) of tert-butyl 7-(4-iodo-1H-pyrazol-1-yl)-2-azaspiro[3.5]nonane-2-carboxylate as a off-white solid.

Provenance & Evidence