3-(2-Hydroxy-ethylidene)-7-oxo-4-oxa-1-aza-bicyclo[3.2.0]heptane-2-carboxylic acid benzyl ester(benzyl calvunlanate) → Clavulanic Acid

Beteiligte Stoffe

Reaktionsschritte

Benzyl clavulanate (100 mgs) in ethanol (5 ml) was hydrogenated over 10% Pd/C (30 mgs) for 45 minutes at ambient temperature and atmospheric pressure. The catalyst was filtered, washed with ethanol and the combined filtrates were evaporated in vacuo to give clavulanic acid as an unstable, viscous oil (58 mgs). N.m.r. (C5D5): 3.05(d,1,J=18 Hz), 3.60(dd,1,J1 =18 Hz), J2 =2.5 Hz), 4.75(d,2,J=7.5 Hz), 5.58(t,1,J=7.5 Hz),5.66 (S,1), 6.0δ(d,1,J=2.5 Hz).

Herkunft & Nachweise