13,13-Dimethyl-des-C,D analogues of (20S)-1α,25-dihydroxy-2-methylene-19-norvitamin D3 (2MD): Total synthesis, docking to the VDR, and biological evaluation
作者:Katarzyna Plonska-Ocypa、Izabela Sibilska、Rafal R. Sicinski、Wanda Sicinska、Lori A. Plum、Hector F. DeLuca
DOI:10.1016/j.bmc.2011.09.048
日期:2011.12
deprotection furnished two isomeric 13,13-dimethyl-des-C,D analogues of 2MD (compounds 10 and 42) differing in configuration of their 7,8-double bond. Pure vitamin D analogues were isolated by HPLC and their biological activity was examined. The in vitro tests indicated that, compared to the analogue 7, unsubstituted at C-13, the synthesized vitamin D analogue 10 showed markedly improved VDR binding ability,
作为我们研究的继续,重点是缺乏C,D-茚满系统的维生素D化合物,(20 S)-1α,25-二羟基-2-亚甲基-19的13,13-二甲基-des - C,D类似物-norvitamin d 3(2,为2Md)通过全合成制备。从酮缩醛13开始合成了已知的环己酮30(所需的A环氧化膦11的前体),而醛12则由先前制备的异构酯34构成了无环“上部”结构单元醛在我们的实验室。 利用1-脯氨酸催化的α-氨基羟甲基化过程,将商品化的1,4-环己二酮单亚乙基缩酮(13)对映体选择性地α-羟基化,并将引入的羟基保护为TBS,TPDPS和SEM醚。然后将获得的化合物15-17中的酮基进行甲基化,并用二氧化硒和吡啶N-氧化物进行烯丙基羟基化。分离异构体后,新引入的羟基得到保护,缩酮基水解生成相应的受保护的(3 R,5 R)-3,5-二羟基环己酮30-32。酯34是C,D片段的起始化合物12首先,将其先进行α-甲