作者:Halina A. Zhylitskaya、Natalia M. Chashchina、Raisa P. Litvinovskaya、Margarita I. Zavadskaya、Vladimir N. Zhabinskii、Vladimir A. Khripach
DOI:10.1016/j.steroids.2016.06.006
日期:2017.1
number of water soluble sulfates of 24‐epibrassinolide including the 2&agr;,3&agr;‐disulfate and all possible monosulfates were synthesized. The target compounds were isolated in crystalline form as the corresponding sodium salts. Pyridine–sulfurtrioxide complex was used as sulfating agent followed by transformation of the resulting pyridinium salts into the sodium sulfates by treatment with NaOH.
Regio- and stereoselective C–H functionalization of brassinosteroids
作者:Alaksiej L. Hurski、Aliaksandr G. Kukel、Aliaksandra I. Liubina、Aliona G. Baradzenka、Darya Straltsova、Vadim Demidchik、Pavel Drašar、Vladimir N. Zhabinskii、Vladimir A. Khripach
DOI:10.1016/j.steroids.2019.03.010
日期:2019.6
Late stage C-H functionalization is a powerful tool for modification of natural compounds. Herein we report that the rhodium-catalyzed reaction of brassinosteroids with aryloxysulfonamides proceeds regio- and stereoselectively at C15 position. The derivative obtained from 24-epibrassinolide was easily transformed to the conjugate with a BODIPY dye bearing unaffected functional groups of the native brassinosteroid.