Rational Design, Synthesis, and Biological Activity of Novel Conformationally Restricted Vitamin D Analogues, (22<i>R</i>)- and (22<i>S</i>)-22-Ethyl-1,25-dihydroxy-23,24-didehydro-24a,24b-dihomo-20-epivitamin D<sub>3</sub>
作者:Hiroyuki Masuno、Keiko Yamamoto、Xinxiang Wang、Mihwa Choi、Hiroshi Ooizumi、Toshimasa Shinki、Sachiko Yamada
DOI:10.1021/jm0105631
日期:2002.4.1
Two new vitamin D analogues, (22R)- and (22S)-22-ethyl-1,25-dihydroxy-23,24-didehydro-24a,24b-dihomo-20-epivitamin D(3) (3 and 4), were rationally designed on the basis of the active space group concept previously proposed by us. The 22R ethyl group of 3 restricts the mobility of the side chain to active space regions, whereas the 22S ethyl group of 4 confines the side chain to an inactive region.
两种新的维生素D类似物(22R)-和(22S)-22-乙基-1,25-二羟基-23,24-二氢氢化物24a,24b-二homo-20-表维生素D(3)(3和4),是根据我们先前提出的主动空间群概念进行合理设计的。3的22R乙基将侧链限制在活性空间区域,而4的22S乙基将侧链限制在惰性区域。C(23)处的双键进一步限制了侧链的柔性。这些化合物(3和4)是使用原酸酯克莱森重排作为关键步骤合成的。正如预期的那样,尽管22R异构体3对维生素D受体(VDR)的亲和力是1,25-二羟基维生素D(3)(1)的近100倍,但在细胞分化方面却比1,25-二羟基维生素D(3)(1)高出近100倍。 22S异构体4的功效明显低于3。