反应详情

(R)-3-(4-(acetoxymethyl)-7-chloro-1H-indazol-5-yl)-1-methoxy-1-oxopropan-2-yl benzoate (8.5g, 19.73 mmol) in a mixture of chloroform (80.0 ml, 992 mmol) and methanol (60.0 ml, 1483 mmol) was added magnesium methoxide (4.18 ml, 39.5 mmol). After 3 h, quenched with 1.0 M HCl and extracted with dichloromethane (300 mL). The crude product was purified by flash chromatography using 70% EtOAc in hexane to give (R)-3-(7-chloro-4-(hydroxymethyl)-1H-indazol-5-yl)-1-methoxy-1-oxopropan-2-yl benzoate in 67% yield. 1H NMR (500 MHz, CDCl3): in δ 8.09 (s, 1H), 7.93 (d, J=7.5 Hz, 1H), 7.47 (m, 1H), 7.32 (t, J=8 Hz, 2H), 7.22 (s, 1H), 5.49 (m, 1H), 4.99 (m, 2H), 3.45-3.41 (m, 1H), 3.68 (s, 3H), 3.36-3.31 (m, 1H); MS (ESI) 389 (M+H); Rf=2.07.

1. customquenched with 1.0 M HCl
2. extractionextracted with dichloromethane (300 mL)
3. customThe crude product was purified by flash chromatography