instead of the 22R,23R-diol function characteristic for most compounds of this class were prepared for biochemical studies. The corresponding non-deuterated compounds are considered intermediates in brassinolide biosynthesis. The carbon skeleton of the side chain with proper stereochemistry at C(24) was prepared from commercially available (2R)-3-hydroxy-2-methylpropanoate. This low molecular fragment was
两个六
氘代油菜素类
固醇(BS)([26,27-2H(6)]-23-dehydroxycastasterone和[26,27-2H(6)]-cathasterone)在C(22)处含有羟基而不是22R,23R制备了大多数此类化合物的β
-二醇功能特性,用于生化研究。相应的非
氘代化合物被认为是
油菜素内酯生物合成的中间体。由市售(2R)-3-羟基-2-甲基
丙酸酯制备具有适当立体
化学的C(24)侧链碳骨架。通过适当的砜与C(22)醛的反应,将该低分子片段与四环甾体片段偶联。22-羟基的必要构型的形成是通过氢化还原相应的酮来实现的。