Structure and stereochemistry of the coumarins ofFerula lehmannii

Two new 7-hydroxycoumarins have been isolated from the roots ofFerula lehmannii (Lehmann's giant fennel): lehmferidin (I), C₂₄H₂₈O₄, M⁺ 380, mp 173–174°C, and lehmferin (II), C₂₄H₃₀O₄, M⁺ 382, mp 118–119°C; and badrakemin (III) has also been identified. The structures and configurations of the asymmetric centers of the new coumarins have been established on the basis of spectral characteristics and conversion into known substances.Institute of the Chemistry of Plant Substances, Academy of Sciences of the Uzbek SSR, Tashkent. Translated from Khimiya Prirodnykh Soedinenii, No. 6, pp. 709–712, November–December, 1983.