反应详情

The crude ethyl 2-[1-(4-aminobenzyl)-1H-indazol-3-yl]acetate (about 0.663 mmol) obtained in the last step and triethylamine (1.0 mL) were dissolved in dichloromethane (15 mL). In an ice bath, a dichloromethane solution (10 mL) of 4-chlorobenzoyl chloride (117 mg, 0.669 mmol) was added dropwise slowly. Upon completion of the dropwise addition, it was reacted at room temperature for 16 hours. An aqueous solution of sodium bicarbonate was added to quench. It was extracted with ethyl acetate. The organic phase was dried over anhydrous sodium sulfate, and filtered. The filtrate was rotate evaporated. The resulting residue was chromatographed on a silica gel column (petroleum ether:ethyl acetate=2:1) to obtain a white solid 159 mg, at a total yield over two steps of reactions of 53.5%.

1. additionUpon completion of the dropwise addition, it
2. customwas reacted at room temperature for 16 hours
3. customto quench
4. extractionIt was extracted with ethyl acetate
5. dry with materialThe organic phase was dried over anhydrous sodium sulfate
6. filtrationfiltered
7. customThe resulting residue was chromatographed on a silica gel column (petroleum ether:ethyl acetate=2:1)