Labdane diterpenes from Cistus symphytifolius |
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| Authors: | MT Calabuig M Cortés CG Francisco R Hernández E Suárez |
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| Institution: | Instituto de Productos Naturales Orgánicos del C.S.I.C., Carretera La Esperanza 2, La Laguna, Tenerife, Canary Islands, Spain |
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| Abstract: | The investigation of the aerial part of Cistus symphytifolius afforded, in addition to sitosterol, trimethoxykaempferol, cativic acid, labdenic acid, labdanolic acid and labdan-8α,15-diol, three new bicyclic diterpenes: cistadienic acid, cistenolic acid and labd-13(E)- ene-8α,15-diol. The structures of these were determined by spectral studies and correlations. CD spectral studies showed that cistenolic acid and salvic acid are enantiomeric compounds, so the stereochemistry of salvic acid (7α-hydroxy-labd-8(17)-ene-15-oic acid) should be changed to 7β-hydroxy-eperu-8(17)-ene-15-oic acid (7β-hydroxy-ent-labd-8(17)-ene-15-oic acid). |
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| Keywords: | Cistaceae jara sitosterol trimethoxykaempferol labdane diterpenes cativic acid labdenic acid labdanolic acid cistadienic acid cistenolic acid labdan-8α 15-diol |
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