6619-95-0Relevant articles and documents
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Ekong,D.E.U.,Ogan,A.U.
, p. 311 - 312 (1968)
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Synthesis of a new allelopathic agent from the biotransformation of ent-15α-hydroxy-16-kauren-19-oic acid with Fusarium proliferatum
Rocha,Vieira, H. da S.,Takahashi,Boaventura
, p. 2647 - 2653 (2017)
The use of kaurane diterpenes as substrates in fungal biotransformation to achieve bioactive compounds has been widely reported. In this work, the natural product kaurenoic acid, a diterpene widely distributed in the plant Kingdom, was chemically converted into ent-15α-hydroxy-kaur-16-en-19-oic acid (1). Substrate 1 was subjected to biotransformation by the fungus Fusarium proliferatum, furnishing a new derivative, ent-2α,15α-dihydroxy-kaur-16-en-19-oic acid (2). The structure of metabolite 2 was deduced on the basis of spectroscopy and MS data. Derivative 2 showed allelopathic activity on germination and growth of root and stem of lettuce (Lactuca sativa), inhibiting 100% of germination and growth of roots and stem, at higher concentration assayed (10?4?mol/L).
Ent-Kaurene Glycosides from Ageratina cylindrica
Bustos-Brito, Celia,Sánchez-Castellanos, Mariano,Esquivel, Baldomero,Calderón, José S.,Calzada, Fernando,Yépez-Mulia, Lilian,Joseph-Nathan, Pedro,Cuevas, Gabriel,Quijano, Leovigildo
, p. 2580 - 2587 (2015)
The aqueous extract of the leaves of Ageratina cylindrica afforded six new ent-kaurenoic acid glycosides together with the known diterpenoid paniculoside V, the flavonoid astragalin, chlorogenic acid, and l-chiro-inositol. The structures were elucidated mainly by NMR and MS methods, and the absolute configuration was established by vibrational circular dichroism spectroscopy. The new compounds showed moderate antiprotozoal activity against Entamoeba histolytica and Giardia lamblia trophozoites.
Discovery and structure-activity relationships of ent-Kaurene diterpenoids as potent and selective 11β-HSD1 inhibitors: Potential impact in diabetes
Deng, Xu,Shen, Yu,Yang, Jing,He, Juan,Zhao, Yu,Peng, Li-Yan,Leng, Ying,Zhao, Qin-Shi
, p. 403 - 414 (2013/10/01)
The biological screening of a collection of nature occurring diterpenoids against 11β-HSD1 resulted in the discovery of the lead compound 1b, which pointed to the therapeutic potential for type 2 diabetes. Subsequently, an optimization project was initiated. Starting from compound 1b and its counterpart 2, the hemi-synthesis was performed on kaurenic acid scaffolds yielding 36 derivatives. Further evaluations on both human and mouse 11β-HSD revealed that seven urea derivatives exhibited significant improved potency and selectivity. Especially, the urea 19a has an IC50 (human 11β-HSD1) = 9.4 nM and selectivity index (human 11β-HSD) > 10,649. The 2D and 3D binding models of the complex 19a/11β-HSD1 were generated using docking simulations. Based on the results, the structural-activity relationships (SARs) of compounds 1b and 2 were also discussed.