832 V. Niddam, M. Medou, J . Dessolin, C. Trabaud, M. Camplo and J .-L. Kraus Vol. 34 ature, water was added and the organic layers were extracted with toluene (3 x 5 ml), dried over anhydrous sodium sulfate and concentrated under reduced pressure. The residue was purified by preparative layer chromatography 1 mm (eluent: toluene) to obtain 5a, 6 mg (16%); Rf = 0.38 (toluene/ethyl acetate: 97/3); 1H nmr (deuteriochloroform): 5 1.65 (s, 2H, OH), 4.20 and ...
