Studies on Coumarins of a Chinese Drug „Qian-Hu”

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Abstract
From the ether-soluble fraction of methanolic extracts of a Chinese Drug “Bai-Hua Quian-Hu”, the root of Peucedanum praeruptorum (Umbelliferae), four coumarin compounds, (±) praeruptorin A, (+) praeruptorin B (= (+) anomalin), Pd-III and Pd-Ib, were isolated. The chemical structures of Pd-III and Pd-Ib have been established to be (+) 3′ (S)-angeroyloxy-4′ (S)-isovaleryloxy-3′, 4′-dihydroseselin and (+) 3′ (R)-angeroyloxy-4′-keto-3′,4′-dihydroseselin, respectively. 13C NMR spectra of these compounds are also discussed.