14β-Fluorosteroids 3 and 4 were synthesized to give a new class of unnatural cardenolides. The total synthesis of racemic 14β-fluorosteroids was accomplished using a highly diastereoselective transannular DielsAlder reaction on a trans-cis-cis macrocyclic triene. The α-fluoro analog 4 provided a comparable inhibitory activity to natural digitoxigenin 1.Key words: fluorosteroid, bioisostere, cardiovascular diseases, transannular DielsAlder reaction (TADA), macrocyclization.
14β-氟类固醇3和4被合成,形成一类新的非天然心苷类化合物。通过高度对映选择性的跨环Diels-Alder反应在反-顺-顺大环三烯烃上完成了14β-氟类固醇的总合成。α-氟类似物4与天然地地黄毒甙1具有可比拟的抑制活性。关键词:氟类固醇,生物同构体,心血管疾病,跨环Diels-Alder反应(TADA),大环化。