反应详情

To a solution of Intermediate 16B (4.00 g, 13.1 mmol) in DCM (50 mL) was added slowly a solution of methylmagnesium bromide in toluene and THF (13.99 mL, 1.400 M, 19.59 mmol) and the reaction mixture was heated to reflux for 2.5 h. The reaction mixture was allowed to cool to rt and, diluted with DCM, washed with saturated NH4Cl, and the organic portion dried over MgSO4, filtered and concentrated. The residue was purified by ISCO chromatography (EtOAc/Hexanes 0-50% over 30 min, column 330 g, flow rate 100 mL/min) to give Intermediate 16C (2.80 g, 8.69 mmol, 67.0% yield) as a white solid. HPLC/MS (Method D) RT=1.12 min, [M+1]+ 322.1; Chiral HPLC (Method L) RT=4.55 min, PA=100%.

1. temperaturethe reaction mixture was heated
2. temperatureto reflux for 2.5 h
3. washwashed with saturated NH4Cl
4. dry with materialthe organic portion dried over MgSO4
5. filtrationfiltered
6. concentrationconcentrated
7. customThe residue was purified by ISCO chromatography (EtOAc/Hexanes 0-50% over 30 min, column 330 g, flow rate 100 mL/min)