反应详情

(R)-3-(2-(acetoxymethyl)-4-amino-5-chloro-3-methylphenyl)-1-methoxy-1-oxopropan-2-yl benzoate (16.33 g, 38.9 mmol) in toluene (100.0 ml, 939 mmol) was added acetic acid (5.0 ml, 87 mmol) followed by isoamyl nitrite (5.76 ml, 42.8 mmol) at 0° C. After 15 min, potassium acetate (7.64 g, 78 mmol) was added and the reaction mixture was stirred for 12 h. The solvent was removed and the crude product was dissolved in dichloromethane (250 mL) and washed with aqueous NaHCO3. The solvent was dried (Na2SO4), evaporated and the crude product was purified by flash chromatography using 40% EtOAc in hexane to give (R)-3-(4-(acetoxymethyl)-7-chloro-1H-indazol-5-yl)-1-methoxy-1-oxopropan-2-yl benzoate in 88% yield. MS (ESI) 453 (M+Na); Rf=2.46.

1. customThe solvent was removed
2. dissolutionthe crude product was dissolved in dichloromethane (250 mL)
3. washwashed with aqueous NaHCO3
4. dry with materialThe solvent was dried (Na2SO4)
5. customevaporated
6. customthe crude product was purified by flash chromatography