Results 181 to 190 of about 6,513 (208)
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Bioactivity of brassinolide methyl ethers
Phytochemistry, 1998Abstract Four new derivatives of brassinolide (BR) were prepared by single or multiple methylation of the hydroxyl groups at C-2, C-3, C-22 and or C-23 to afford (22 R ,23 R ,24 S )-2 α ,3 α ,23-trihydroxy-22-methoxy-7-oxa-7a-homo-5 α -ergostan-6-one (22-MeBR), (22 R ,23 R ,24 S )-2 α ,3 α ,22-trihydroxy-23-methoxy-7-oxa-7a-homo-5 α -ergostan-6-one ...
Weide Luo +3 more
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A formal synthesis of brassinolide
Tetrahedron Letters, 1997Abstract Enzyme-catalysed differentiation of hydroxy groups in a C 2v -shaped tetraol-sulfide, combined with a E -stereoconvergent Ramberg-Backlund process, allowed to prepare pure (2 S )-2,3-dimethyl-1-iodobutane, which could be coupled with a 3,5-cyclopregnane-20-thiomethanol derivative so as to give an efficient precursor of the title vegetal ...
T. Schmittberger, D. Uguen
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Tetrahedron, 1990
Abstract A stereoselective synthesis of the brassinolide side chain involves the lactonization of Z-10 under acidic condition to give an α,β-unsa-turated-δ-lactone 11 with the inversion of the configuration at C-22 of the epoxy steroid in quantitative yield.
Zhou Wei-shan, Jiang Biao, Pan Xin-fu
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Abstract A stereoselective synthesis of the brassinolide side chain involves the lactonization of Z-10 under acidic condition to give an α,β-unsa-turated-δ-lactone 11 with the inversion of the configuration at C-22 of the epoxy steroid in quantitative yield.
Zhou Wei-shan, Jiang Biao, Pan Xin-fu
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Brassinolide, a growth‐promoting steroidal lactone
Physiologia Plantarum, 1981Brassinolide (BR), a naturally‐occurring steroidal lactone was compared with GA3 and kinetin for activity in a number of bioassays. BR was highly active in elongation bioassays employing the dwarf pea epicotyl and etiolated bean hypocotyl that are responsive to GA3 but not IAA (at 0.01 to 10 μM).
N. Bhushan Mandava +2 more
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Brassinolide may control aquaporin activities in Arabidopsis thaliana
Planta, 2001It is usually assumed that aquaporins present in the cellular membranes could be an important route in the control of water flux in plants, but evidence for this hypothesis is scarce. In this paper, we report measurements of the osmotic permeability (P(os) of protoplasts isolated from hypocotyls of wild-type and mutant Arabidopsis thaliana (L.) Heynh ...
Morillon, Raphaël +4 more
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ChemInform Abstract: Synthesis of Brassinolide (I).
ChemInform, 1993AbstractChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.
T. C. MCMORRIS +3 more
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In silico exploration for agonists/antagonists of brassinolide
Bioorganic & Medicinal Chemistry Letters, 2016Brassinolide (BL) is a plant steroid hormone that is necessary for stem elongation and cell division. To date more than 70 steroidal BL-like compounds, which are collectively named as brassinosteroids, have been identified. However, non-steroidal compounds that mimic BL have not been reported yet, which can be used as plant growth regulators.
Seisuke, Takimoto +5 more
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ChemInform, 1990
AbstractThe brassinolide side chain is synthesized stereoselectively following the reaction sequence (I) → (VII).
W. ZHOU, B. JIANG, X. PAN
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AbstractThe brassinolide side chain is synthesized stereoselectively following the reaction sequence (I) → (VII).
W. ZHOU, B. JIANG, X. PAN
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Improved Synthesis of Castasterone and Brassinolide†
Journal of Chemical Research, 1997Castasterone 1 is synthesized in 32% overall yield in eight steps from the known (20S)-6,6-ethylenedioxy-20-formyl-3α,5-cyclo-5α-pregnane 4.
Tsuyoshi Watanabe +3 more
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A brassinolide biosynthetic pathway via 6-deoxocastasterone
Phytochemistry, 1996Abstract The occurrence of 6-deoxocastasterone was demonstrated by GC-mass spectrometry in cultured cells of Catharanthus roseus . Its concentration was in the range 5.9–18.9 ng g -1 fr. wt. A feeding experiment with deuterium labelled 6-deoxocastasterone revealed that 6-deoxocastasterone was converted into castasterone and brassinolide in cultured
Yong-Hwa Choi +5 more
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