Stereoselective Syntheses of Dihydroxerulin and Xerulinic Acid, Anti-Hypocholesterolemic Dyes from the Fungus<i>Xerula melanotricha</i>
作者:Achim Sorg、Konrad Siegel、Reinhard Brückner
DOI:10.1002/chem.200400913
日期:2005.2.18
inhibitors of the biosynthesis of cholesterol, were synthesized in a convergent and perfectly stereoselective manner. In the key step, bromobutenolide 6 (obtained from levulinic acid in two steps) was coupled with either of the novel bis(stannanes) trans,cis,trans-35 or trans,trans,trans-35 [each accessible from 3-(tributylstannyl)allyl alcohol (17) in four steps], giving gamma-alkylidenebutenolide trans
以会聚且完全立体选择性的方式合成了作为胆固醇生物合成抑制剂的标题化合物2和3。在关键步骤中,将溴丁烯内酯6(分两步从乙酰丙酸中获得)与新型双(stannanes)反式,顺式,反式-35或反式,反式,反式-反式35偶联[每个都可从3-(三丁基锡烷基)获得醇)(17个步骤,共分四个步骤),得到γ-亚烷基亚丁烯内酯trans,trans,trans-32。该化合物与碘二炔42或溴代二炔酸酯44偶合,分别产生二氢干蛋白(2)和干蛋白酸的(三甲基甲硅烷基乙基)酯45。后者的脱保护首次提供了完全合成的木藻酸(3)。