Reaction #674310

Reaction equation

4-iodo-1H-pyrazole

tert-butyl 7-(methylsulfonyloxy)-2-azaspiro[3.5]nonane-2-carboxylate

4-iodo-1H-pyrazole

Cs2CO3

→

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

Yield 81.0%

Solvents

DMF

Conditions

Workup

1. 1
   ConcentrationIt was concentrated by rotary evaporator in vacuo
2. 2
   Otherto give the residue which
3. 3
   Otherwas purified by CombiFlash (12 g silica gel column, EtOAc/Hex: 0-40%)

Procedure

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.

Source