Structure and configuration of a new diterpenoid lactone fromLagochilus hirsutissimus

The epigeal part of the plantLagochilus hirsutissimus has yielded a new diterpenoid lactone — lagohirsidin, C₂₂H₃₄O₅, mp 144–145°C, [α] _D ²² ? 17.5° (c 1; ethanol). Reduction with LiAlH₄ has yielded a diol C₂₂H₃₈O₅, mp 165–166°C [α] _D ²⁰ ?1.2 (c 0.6; ethanol). Acid hydrolysis of the diol has led to the formation of lagochilin, C₂₀H₃₆O₅, mp 167–168°C, [α] _D ²⁰ ?3.9° (c 1; ethanol). The synthesis of lagohirsidin from lagochilin has been effected.     

A new ent-labdane diterpenoid lactone from Andrographis paniculata

<正>A new ent-labdane diterpenoid lactone was isolated from Andrographis paniculata.Its structure was identified on the basis of spectral data including 2D NMR.     

A new cassane diterpenoid lactone from the seed of Caesalpinia minax

A new cassane diterpenoid lactone was isolated from the seed of Caesalpinia minax.On the basis of spectral evidences,its structure was established as 12α-methoxyl,5α,14β-dihydroxy- 1α,6α,7β-triacetoxycass- 13(15)-en- 16,12-olide.     

A new cassane diterpenoid lactone from the seed of Caesalptma minax

A new cassane diterpenoid lactone was isolated from the seed of Caesalpinia minax.On the basis of spectral evidences,its structure was established as 12α-methoxyl,5α,14β-dihydroxy-1α,6α,7β-triacetoxycass-13(15)-en-16,12-olide.     

Feropodin-a sesquiterpene lactone from the roots ofFerula oopoda

Conclusions From the resin of the roots ofFerula oopoda (Boiss. et Buhse) Boiss. a new sesquiterpene lactone, feropodin, with the composition C₁₅H₂₀O₂, mp 140–141° C, has been isolated. The alternative hypothetical structures I and II have been proposed for feropodin.Khimiya Prirodnykh Soedinenii, Vol. 5, No. 4, pp. 245–247, 1969     

Study of the structure of saurin, a sesquiterpene lactone fromSaussurea pulchella

Summary Saurin, a sesquiterpene isolated fromSaussurea pulchella Fisch., has the composition C₁₅H₁₅O₅ · 0.5 H₂O. It It contains a -lactone ring, two hydroxy groups, two terminal methylene groups, and a keto group in a five-membered ring. Dehydrogenation with selenium gives chamazulene and, apparently, guaiazulene. Two possible structural formulas of saurin, (Ia) and (Ib), are proposed.Khimiya Prirodnykh Soedinenii, Vol. 2, No. 4, pp. 245–248, 1966     

Structure of arnebifuranone,new monoterpenylbenzoquinone from arnebia euchroma

A new monoterpenylbenzoquinone named arnebifuranone (5) was isolated from arnebiaeuchroma (Royle) Johnst. and its structure was elucidated to be a 2,3-dimethoxy-1,4-benzoquinone having a monoterpene side chain containing a furan ring. The monoterpene moiety is bonded to the benzoquinone ring with its head carbon.     

A sesquiterpene lactone badkhysinin from the roots ofFerula oopoda

Summary A sesquiterpene lactone with the composition C₂₀H₂₄O₅, mp 104°–105° C, []_D –212.4° C (alcohol) has been isolated from the roots ofFerula oopoda Boiss. and has been called badkhysinin. Badkhysinin is an ester of angelic acid and an epoxyhydroxylactone C₁₅H₁₈O₄ with mp 185°–186° C apparently related to guaianolide with a hydrocarbon skeleton of irregular structure. A number of possible structural formulas for badkhysinin are given.Khimiya Prirodnykh Soedinenii, Vol. 2, No. 2, pp. 93–99, 1966     

Structure of ferulidin: A new sesquiterpene lactone

Conclusions 1. From the roots ofFerula oopoda (Boiss. et Buhse) Boiss. a new sesquiterpene lactone C₁₅H₁₈O₄ with mp 170–172° C has been isolated; it has been called ferulidin.2. We have shown that ferulidin has the structure I.Khimiya Prirodnykh Soedinenii, Vol. 6, No. 4, pp. 428–431, 1970     

Structure of ferulidin: A new sesquiterpene lactone

Chemistry of Natural Compounds - 1. From the roots ofFerula oopoda (Boiss. et Buhse) Boiss. a new sesquiterpene lactone C15H18O4 with mp 170–172° C has been isolated; it has been called...     

Structure of a glucuronoxylan of the stems ofSymphytum asperum

The results are given of an investigation of the structure of a glucuronoxylan of the stems ofSymphytum asperum Ler. The xylan was isolated by alkaline extraction and was purified by reprecipitation via the copper complex. The polysaccharide was homogeneous according to the results of gel filtration and electrophoresis. It was shown by hydrolysis, periodate oxidation, methylation, oxidation with chromium trioxide and IR and¹³C NMR spectroscopy that the macromolecules were based on a -(14)-polyxyloside chain having side chains at the second carbon atoms in the form of 4-O-Me-D-glucuronic acid. To each side chain there were not less than 12 xylose residues.M. V. Lomonosov Technological Institute of the Food Industry, Odessa. Translated from Khimiya Prirodnykh Soedinenii, No. 4, pp. 478–481, July–August, 1985.     

A crotofolane-type diterpenoid and a rearranged nor-crotofolane-type diterpenoid with a new skeleton from the stems of Croton cascarilloides

From the stems of Croton cascarilloides collected in the Okinawa Islands, a structurally rare crotofolane-type diterpenoid (1) and a rearranged nor-crotofalane, a new skeletal diterpenoid (2) were isolated. The structures were determined by X-ray crystallographic analyses, establishing their absolute stereostructures for the first time. Compound 2 was probably biosynthesized from 1 through several steps, such as decarboxylation, oxidation, C-C bond migration.