60857-08-1Relevant articles and documents
Pharmaceutical potential of phorbol esters from Jatropha curcas oil
Devappa, Rakshit K.,Malakar, Chandi C.,Makkar, Harinder P.S.,Becker, Klaus
, p. 1459 - 1462 (2013)
Phorbol esters (PEs) are diterpenes present in Jatropha curcas L. seeds and have a myriad of biological activities. Since PEs are toxic, they are considered to be futile in Jatropha-based biodiesel production chain. In the present study, the extracted PEs from Jatropha oil were used as a starting material to synthesise pharmacologically important compound, prostratin. The prostratin synthesised from Jatropha showed identical mass with that of the reference standard prostratin, as determined by Nano-LC-ESI-MS/MS. Considering the rapid growth in Jatropha biodiesel industry, potential exists to harness large amount of PEs which can be further utilised to synthesise prostratin as a value added product.
Unified Total Syntheses of Rhamnofolane, Tigliane, and Daphnane Diterpenoids
Hirose, Akira,Watanabe, Ayumu,Ogino, Kohei,Nagatomo, Masanori,Inoue, Masayuki
, p. 12387 - 12396 (2021)
Rhamnofolane, tigliane, and daphnane diterpenoids are structurally complex natural products with multiple oxygen functionalities, making them synthetically challenging. While these diterpenoids share a 5/7/6-trans-fused ring system (ABC-ring), the three-carbon substitutions at the C13- and C14-positions on the C-ring and appending oxygen functional groups differ among them, accounting for the disparate biological activities of these natural products. Here, we developed a new, unified strategy for expeditious total syntheses of five representative members of these three families, crotophorbolone (1), langduin A (2), prostratin (3), resiniferatoxin (4), and tinyatoxin (5). Retrosynthetically, 1-5 were simplified into their common ABC-ring 6 by detaching the three-carbon units and the oxygen-appended groups. Intermediate 6 with six stereocenters was assembled from four achiral fragments in 12 steps by integrating three powerful transformations, as follows: (i) asymmetric Diels-Alder reaction to induce formation of the C-ring; (ii) π-allyl Stille coupling reaction to set the trisubstituted E-olefin of the B-ring; and (iii) Eu(fod)3-promoted 7-endo cyclization of the B-ring via the generation of a bridgehead radical. Then 6 was diversified into 1-5 by selective installation of the different functional groups. Attachment of the C14-β-isopropenyl and isopropyl groups led to 1 and 2, respectively, while oxidative acetoxylation and C13,14-β-dimethylcyclopropane formation gave rise to 3. Finally, formation of an α-oriented caged orthoester by C13-stereochemical inversion and esterification with two different homovanillic acids delivered 4 and 5 with a C13-β-isopropenyl group. This unified synthetic route to 1-5 required only 16-20 total steps, demonstrating the exceptional efficiency of the present strategy.
Chemical total-synthesis preparation method of prostratin
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, (2018/09/28)
The invention discloses a chemical total-synthesis preparation method for prostratin. The chemical total-synthesis preparation method is characterized in that an easily prepared 5-(hydroxymethyl)-2-cyclopentene-1-alcohol is taken as a raw material, light oxidization de-arylation reaction is performed, addition is induced in molecules, olefin double decomposition reaction is performed, and a targetproduct is finally obtained through functional group conversion. The preparation method is simple and convenient in operation, and is gentle in condition, and the synthesized products are consistentwith spectral data of natural products.
Process to Produce Prostratin and Structural or Functional Analogs Thereof
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Page/Page column 12-13, (2009/07/25)
This invention concerns a process to convert a hydroxyl group (bold in R3C—OH) in a tigliane-type compound to a hydrogen (bold in R3C—H) to obtain deoxytigliane-type compounds or structural or functional analogs thereof. The process has wide application particularly to produce specific biologically active compounds in quantity for use as pharmaceuticals. In particular the process can be used to convert phorbol to a 12-deoxytigliane (prostrating which is a therapeutic lead for the treatment of AIDS. New compositions of matter are also disclosed.