反应详情

A solution of 0.3 g of benzyl 5-[(N-benzyloxycarbonyl-L -alanyl)aminomethyl]-3,6-dimethoxy-9,9-dimethylxanthene-4-acetate in 85 ml of trifluoroethanol was stirred under hydrogen for 15 minutes in the presence of palladium/charcoal (10%). The catalyst was filtered off and rinsed with trifluoroethanol. The filtrate and wash solution were brought to dryness and the combined residue was chromatographed over silica gel in chloroform/methanol/water, whereby 0.1.8 g 5-(L-alanylaminomethyl)-3,6-dimethoxy-9,9-dimethylxanthene-4-acetic acid was obtained as a colourless foam; IR 3450-2400, 1679, 1606, 1575, 1493 cm-1.

1. filtrationThe catalyst was filtered off
2. washrinsed with trifluoroethanol
3. washThe filtrate and wash solution
4. customthe combined residue was chromatographed over silica gel in chloroform/methanol/water