2616-79-7Relevant academic research and scientific papers
Synthesis of five known brassinosteroid analogs from hyodeoxycholic acid and their activities as plant-growth regulators
Duran, María Isabel,González, Cesar,Acosta, Alison,Olea, Andrés F.,Díaz, Katy,Espinoza, Luis
, (2017)
Brassinosteroids (BRs) are plant hormones that promote growth in different plant organs and tissues. The structural requirements that these compounds should possess to exhibit this biological activity have been studied. In this work, a series of known BR analogs 5-15, were synthesized starting from hyodeoxycholic acid 4, and maintaining the alkyl side chain as cholic acid or its methyl ester. The growth-promoting effects of brassinolide (1) and synthesized analogs were evaluated by using the rice lamina inclination assay at concentrations ranging from 1 × 10-8-1 × 10-6 M. Our results indicate that in this concentration range the induced bending angle of rice seedlings increases with increasing concentration of BRs. Analysis of the activities, determined at the lowest tested concentration, in terms of BR structures shows that the 2α,3α-dihydroxy-7-oxa-6-ketone moiety existing in brassinolide is required for the plant growing activity of these compounds, as it has been proposed by some structure-activity relationship studies. The effect of compound 8 on cell elongation was assessed by microscopy analysis, and the results indicate that the growth-promoting effect of analog 8 is mainly due to cell elongation of the adaxial sides, instead of an increase on cell number.
Structural modifications of deoxycholic acid to obtain three known brassinosteroid analogues and full NMR spectroscopic characterization
Herrera, Heidy,Carvajal, Rodrigo,Olea, Andrés F.,Espinoza, Luis
, (2016/09/23)
An improved synthesis route for obtaining known brassinosteroid analogues, i.e., methyl 2α,3α-dihydroxy-6-oxo-5α-cholan-24-oate (11), methyl 3α-hydroxy-6-oxo-7-oxa-5α-cholan-24-oate (15) and methyl 3α-hydroxy-6-oxa-7-oxo-5α-cholan-24-oate (16), from hyodeoxycholic acid (4) maintaining the native side chain is described. In the alternative procedure, the di-oxidized product 6, obtained in the oxidation of methyl hyodeoxycholate 5, was converted almost quantitatively into the target monoketone 7 by stereoselective reduction with NaBH4 , increasing the overall yield of this synthetic route to 96.8%. The complete 1H- and 13C-NMR assignments for all compounds synthesized in this work have been made by 1D and 2D heteronuclear correlation gs-HSQC and gs-HMBC techniques. Thus, it was possible to update the spectroscopic information of 1H-NMR and to accomplish a complete assignment of all 13C-NMR signals for analogues 5-16, which were previously reported only in partial form.
NEUROACTIVE STEROIDS, COMPOSITIONS, AND USES THEREOF
-
, (2013/03/26)
Compounds are provided according to Formula (I) and pharmaceutically acceptable salts thereof, wherein Z is a group of the formula (i), (ii), (iii), (iv), or (v), and wherein L1, L2, L3, X1, X2, Y, Rz4, Rz5, Rz6, n, R1, R2, R3a, R3b, R4a, R4b, R6a, R6b, R7a, R7b, R11a, R11b, R14, R17, R19, R20, R23a, R23b, and R24 are as defined herein, and pharmaceutical compositions thereof. Compounds of the present invention are contemplated useful for the prevention and treatment of a variety of CNS-related conditions in mammals.
