Synthesis of (+)-9-Demethyl-7,8-dideoxycalopin as a Model for the Determination of the Absolute Stereochemistry of a New Group of Fungal Metabolites
作者:Heiner Ebel、Kurt Polborn、Wolfgang Steglich
DOI:10.1002/1099-0690(200209)2002:17<2905::aid-ejoc2905>3.0.co;2-3
日期:2002.9
steps. 1H NMR comparison of the MTPA esters derived from compound 3 with those from natural calopin supported the assignment of the (2S,3R,4S) configuration to this new group of fungal metabolites. Further evidence of the absolute configuration was obtained by comparison of the CD spectra of calopin and of model compound 3. (© Wiley-VCH Verlag GmbH, 69451 Weinheim, Germany, 2002)
合成(+)-9-去甲基-7,8-二脱氧牛op素(3)的关键步骤是苯基薄荷基乙醛酸酯8与β,β-二甲基苯乙烯(7)之间的高度立体选择性烯反应。所得高烯丙基醇9的氢硼化仅提供不期望的差向异构体10,其最终通过一系列氧化,差向异构化和还原步骤被转化为靶3。化合物3衍生的MTPA酯与天然Calopin衍生的MTPA酯的1 H NMR比较支持了(2 S,3 R,4 S)配置为这组新的真菌代谢产物。通过比较Calopin和模型化合物3的CD光谱,获得了绝对构型的进一步证据。(©Wiley-VCH Verlag GmbH,69451 Weinheim,Germany,2002)