反应详情

Zinc dust (3.30 g, 50.4 mmol) was added portionwise to a stirred solution of 2-hydroxyimino-3-(5-bromo-1H-indol-3-yl)-propionic acid ethyl ester (4.10 g, 12.61 mmol) in acetic acid (100 mL) over 30 min. After stirring overnight, the mixture was filtered through CELITE® and concentrated. The residue was dissolved in 1 N HCl and re-evaporated to give 4.30 g of the title compound as a crude material. LCMS m/z (ESI) [M−HCl+H]+ calcd for C1-3H15BrN2O2 (Br79) 312.2, found 312.2.

1. filtrationthe mixture was filtered through CELITE®
2. concentrationconcentrated
3. dissolutionThe residue was dissolved in 1 N HCl
4. customre-evaporated