1,4-Cycloadducts of various steroidal5,7-dienes and 4-phenyl-1-2-4-triazoline-3,5-dione gave a separable mixture (3 : 2) of the corresponding Δ5- and Δ7-sterols in good yield when treated with lithium dissolved in refluxing rthylamine.
Biological Activity of Brassinosteroids - Direct Comparison of Known and New Analogs<i>in planta</i>
作者:Sebastian Wendeborn、Mathilde Lachia、Pierre M. J. Jung、Jörg Leipner、David Brocklehurst、Alain De Mesmaeker、Katharina Gaus、Régis Mondière
DOI:10.1002/hlca.201600305
日期:2017.2
presented. We describe in detail their synthetic preparation, which includes significant improvements of previously reported protocols as well as access to new analogs with functional modifications of the steroid skeleton and of the C(17)‐attached side chain. We report the biological potency of the prepared brassinosteroid analogs as plant hormones, which were carefully established in the French bean
The sterol mixture of the southern Japan's softcoral, Sarcophyton glaucum, was found to contain 11 sterols including a novel sterol, 23,24 xi-dimethylcholesta-5,22-dien-3 beta-ol and a new diunsaturated C29 sterol. 22,23-Dihydrobrassicasterol and gorgosterol were the major components in free- and esterified sterols respectively. Brassicasterol was found in S. glaucum, in contrast to the ubiquity of