反应详情

Lithium aluminium hydride (15 mg, 0.2 mmol) was added slowly to a stirred solution of methyl 3-{1-(1,3-benzodioxol-5-yl)-2-[(2-methoxy-4-methylphenyl)sulfonamido]-2-oxo-ethyl}-1-methyl-1H-6-indolecarboxylate (from step (a), 220 mg, 0.4 mmol) in tetrahydrofuran at 0° C. under a nitrogen atmosphere. After 2 h a further 1 equivalent (30 mg) of lithium aluminium hydride was added and the mixture was warmed to room temperature. After 1 h ethyl acetate (10 ml) was carefully added and the product extracted from 1 N hydrochloric acid with ethyl acetate (2×50 ml). The combined organic layers were dried (MgSO4) and concentrated in vacuo. Purification by flash column chromatography (elution with 95% dichloromethane/5% methanol) gave the product as a white solid (130 mg).

1. extractionthe product extracted from 1 N hydrochloric acid with ethyl acetate (2×50 ml)
2. dry with materialThe combined organic layers were dried (MgSO4)
3. concentrationconcentrated in vacuo
4. customPurification
5. washby flash column chromatography (elution with 95% dichloromethane/5% methanol)