Sesquiterpenoid derivatives from Ferula ferulioides. V

Nine novel prenyl-dihydrofurocoumarin-type sesquiterpenoid derivatives, 2,3 -dihydro-7-hydroxy-2R*,3R*dimethyl-2-14,8-dimethyl-3(E),7-nonadienyl]-furo[ 3,2-c]coumarin, 2,3-dihydro-7-hydroxy-2S*,3R*-dimethyl-214,8-dimethyl-3(E), 7-nonadien-6-onyl]-furo[3,2-c]coumarin, 2,3-dihydro-7-hydroxy-2S;,3R*-dimet hyl-2-14-methyl-5(4-methyl-2-furyl)-3(E)-pentenyl]-furo[3,2-c]coumarin. 2,3 -dihydro-7-hydroxy-2R*,3R*-dimethyl-2-[4-methyl-5(4-methyl-2-furyl)-3(E)-pe ntenyl]-furo[3,2-c]coumarin, 2,3-dihydro-7-methoxy-2S*,3R*-dimethyl-2-[4,8- dimethyl-3(E),7-nonadienyl]-furo[3,2-c]coumarin, 2,3-dihydro-7-methoxy-2R*, 3R*-dimethyl-2-[4,8-dimethyl-3(E),7-nonadienyl]-furo[3,2-c]coumarin, 2,3-di hydro-7-methoxy-2S*,3R*-dimethyl-2-14,8-dimethyl-3(E),7-nonadien-6-onyl]-fu ro[3,2-cicoumarin, and 2,3-dihydro-7-methoxy-2S*,3R*-dimethyl-2-[4-methyl-5 -(4-methyl-2-furyl)-3(E)-pentenyl]-furo[3,2-c]coumarin, were isolated from the roots of Ferula ferulioides. The structures were established by compreh ensive spectral analysis. The biosynthetic pathway leading to these prenyl- furocoumarin-type sesquiterpenoids is proposed based on their structures.