Synthesis and Biological Activity of 2-Methylene Analogues of Calcitriol and Related Compounds
作者:Izabela K. Sibilska、Marcin Szybinski、Rafal R. Sicinski、Lori A. Plum、Hector F. DeLuca
DOI:10.1021/acs.jmedchem.5b01295
日期:2015.12.24
In an attempt to prepare vitamin D analogues that are superagonists, (20R)- and (20S)-isomers of 1α-hydroxy-2-methylenevitamin D3 and 1α,25-dihydroxy-2-methylenevitamin D3 have been synthesized. To prepare the desired A-ring dienyne fragment, two different approaches were used, both starting from the (−)-quinic acid. The obtained derivative was subsequently coupled with the C,D-ring enol triflates
在试图制备维生素d类似物是超级激动剂,(20 - [R )-和(20小号)1α-羟基-2- methylenevitamin d的-异构体3和1α,25-二羟基-2- methylenevitamin d 3已被合成。为了制备所需的A环二烯炔片段,使用了两种不同的方法,均从(-)-奎尼酸开始。随后使用Sonogashira反应将获得的衍生物与衍生自相应的Grundmann酮的C,D-环烯醇三氟甲磺酸酯偶联。此外,(20 R)-和(20 S)-1α,25-二羟基-2-亚甲基维生素D 3化合物具有(5 E)-构型是通过碘催化的异构化制备的。天然激素的所有四个2-亚甲基类似物都具有很高的体外活性。如预期的那样,25-脱氧类似物的效力要低得多。在合成的化合物中,发现两个化合物1α,25-二羟基-2-亚甲基维生素D 3及其C-20差向异构体的活性几乎与2-亚甲基-19- nor- (20 S)-1α相同,骨骼上有25-二羟基维生素D