VitaminD3 active metabolites 24R,25-(OH)2-D3, 24S,25-(OH)2-D3, and 1 alpha, 24R,25-(OH)3-D3 were synthesized by a convergent and stereoselective approach. In the synthetic route, the stereogenic center at C-24 was generated through ultrasonically induced aqueous conjugate addition of iodide 6 to Seebach's dioxolanone 5, and the vitamin D triene system was constructed using the Lythgoe approach. The
Two 24-fluoro-25-hydroxyvitamin D3 analogues (3,4) were synthesized in a convergent manner. The introduction of a stereocenter to the vitaminD3 side-chain C24 position was achieved via Sharpless dihydroxylation, and a deoxyfluorination reaction was utilized for the fluorination step. Comparison between (24R)- and (24S)-24-fluoro-25-hydroxyvitamin D3 revealed that the C24-R-configuration isomer 4 was
以收敛方式合成了两种 24-氟-25-羟基维生素 D 3类似物 ( 3 , 4 )。将立体中心引入维生素 D 3侧链 C24 位置是通过 Sharpless 二羟基化实现的,并且脱氧氟化反应用于氟化步骤。(24 R )- 和 (24 S ) -24-氟-25-羟基维生素 D 3 之间的比较表明,C24- R-构型异构体4比其 24 S-异构体3更能抵抗 CYP24A1 依赖性代谢。CYP24A1 主要代谢物(24 R)-24,25-二羟基维生素 D 3 ( 6 ) 及其 24 S-异构体 ( 5 ) 也平行使用合成中间体 ( 30 , 31 ) 进行了研究。
Synthesis and biological characterization of 1α,24,25-trihydroxy-2β-(3-hydroxypropoxy)vitamin D3 (24-hydroxylated ED-71)
24-Hydroxylated derivatives were synthesized in 24(R) and 24(S) forms by the convergent method as analogs related to 1alpha,25-dihydroxy-2beta-(3-hydroxypropoxy)vitamin D(3). In the convergent synthesis, the A-ring fragment, synthesized from diethyl D-tartarate, and the C/D-ring fragments in 24(R) and 24(S) forms (vitamin D numbering), obtained from vitamin D(2) via the Inhoffen-Lythgoe diol, were
side-chain-hydroxylated D3derivatives was explored. We found that the 24R and 26R metabolites were more effectively hydroxylated at C1 by CYP27B1 compared to the corresponding S diastereomers. However, CYP27B1 showed almost no activity towards either of the diastereomers of the 23-hydroxylated derivative. This is the first report to show that CYP27B1 metabolizes 26-hydroxylated D3, converting 25,26D3