In this paper, we report an efficient synthetic route for the 23,23-difluoro-25-hydroxyvitamin D3 (5) and its 24-hydroxylated analogues (7,8), which are candidates for the CYP24A1 main metabolites of 5. The key fragments, 23,23-difluoro-CD-ring precursors (9–11), were synthesized starting from Inhoffen-Lythgoe diol (12), and introduction of the C23 difluoro unit to α-ketoester (19) was achieved using
在本文中,我们报告了 23,23-二
氟-25-羟基
维生素 D 3 ( 5 ) 及其 2
4-羟基化类似物 ( 7 , 8 ) 的有效合成路线,它们是 CYP24A1 主要代谢物5的候选物。从 Inhoffen-Lythgoe 二醇 (12) 开始合成关键片段 23,23-二
氟-CD-环前体 (9-11) ,并使用N将C23二
氟单元引入 α-
酮酯 ( 19 ) , N-二乙
氨基三
氟化
硫 (
DAST)。初步
生物学评价表明,23,23-F 2 -25(OH)D 3( 5 ) 与非
氟化对应物 25(OH)D 3 ( 1 )相比,对 CYP24A1 代谢的抗性高约 8 倍,VDR 结合亲和力低 12 倍。