Methyl iodide → 5-((tert-Butyldimethylsilyl)oxy)-3-iodo-1-methyl-1H-indazole

Beteiligte Stoffe

Reaktionsbedingungen

Reaktionsschritte

In a round-bottomed flask, 5-(tert-butyl-dimethyl-silanyloxy)-3-iodo-1H-indazole (1.65 g, 4.41 mmol) was dissolved in THF (16 ml). The solution was cooled to 0° C. and potassium tert-butoxide (697 mg, 6.22 mmol) was added. The reaction mixture was stirred at 0° C. for 30 min then methyl iodide (0.38 ml, 6.08 mmol) was added dropwise. After the addition was complete, the ice bath was removed and the reaction mixture was stirred at room temperature for 4.5 h. The reaction was quenched with water and extracted with EtOAc (2×). The combined organic layers were washed with water and brine then dried over sodium sulfate, filtered and concentrated. The residue was chromatographed over silica gel with EtOAc/hexanes (gradient 0-10% EtOAc) to give 770 mg (45%) of 5-(tert-butyl-dimethyl-silanyloxy)-3-iodo-1-methyl-1H-indazole as a light yellow solid.

Herkunft & Nachweise