N-bromobutanimide → 5-bromo-1-tosyl-6,7-dihydro-1H-indazol-4(5H)-one

Beteiligte Stoffe

Reaktionsschritte

According to Scheme 3 Step 3: N-Bromosuccinimide (3.44 mmol, 613 mg) was added to a solution of 1-tosyl-6,7-dihydro-1H-indazol-4(5H)-one (3.44 mmol, 1.00 g) in DCM (10 mL) and the reaction mixture was stirred at room temperature for 12 hours. A solution of NaHCO3 was added to the reaction mixture and the aqueous phase was extracted with DCM. The organic phase was dried over Na2SO4 and concentrated to yield 5-bromo-1-tosyl-6,7-dihydro-1H-indazol-4(5H)-one (2.44 mmol, 900 mg, 42%) as an orange oil.

Herkunft & Nachweise