Enantioselective Total Synthesis of atrans-Hydrindane Rings/Side-Chain Building-Block of Vitamin D− Asymmetric Induction in an Acid-Catalyzed Conjugate-Addition Reaction
作者:Evgueni Gorobets、Viatcheslav Stepanenko、Jerzy Wicha
DOI:10.1002/ejoc.200300611
日期:2004.2
For the enantioselective total synthesis of 1α,25-dihydroxyvitamin D3 (3), we have developed an enantioselective approach to the “northern” portion building-block 8, starting from the optically active hexanoic acid derivative 44, 2-methylcyclopent-2-en-1-one (10) and 1-(phenylthio)but-3-en-2-one (9). The steric course of the addition reaction of homochiral (S)-ketene acetals 28, 40, 44 and 58 with
对于 1α,25-二羟基维生素 D3 (3) 的对映选择性全合成,我们开发了一种对“北部”部分构建块 8 的对映选择性方法,从光学活性己酸衍生物 44, 2-methylcyclopent-2-en 开始-1-一 (10) 和 1-(苯硫基)but-3-en-2-one (9)。检查了同手性 (S)-烯酮缩醛 28、40、44 和 58 与 10 的加成反应的空间过程。我们发现,在 28、44 和 40 的情况下,反应以高的简单和诱导(面部)非对映选择性发生。(© Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2004)