Inter- and Intramolecular Hetero-Diels-Alder Reactions; Part 50: Domino Reactions in Organic Chemistry: The Knoevenagel-hetero-Diels-Alder-Hydrogenation Sequence for the Biomimetic Synthesis of Indole Alkaloids via Strictosidine Analogues
作者:Lutz F. Tietze、Jürgen Bachmann、Jürgen Wichmann、Olaf Burkhardt
DOI:10.1055/s-1994-25669
日期:——
A new biomimetic access to indole alkaloid derivatives via strictosidine analogues is described using a highly efficient and selective domino reaction consisting of a tandem Knoevenagel-hetero-Diels-Alder-hydrogenation sequence. In a three component reaction of the aldehyde 27f, the 1,3-dicarbonyl compound 28 and the enol ether 30a a 1 : 1-mixture of 31c and 31d is obtained in 91% yield which after hydrogenation gives the indole alkaloid derivative 35a belonging to the pseudo series as a single compound. Similarly, reaction of 27f, 28 and 30b also affords 35a after hydrogenation as the only compound. In the domino reaction of 27e, 28 and 30a the indole alkaloid derivative 36b of the normal type is formed in 46% yield.
本文介绍了一种通过严格苷类似物获得吲哚生物碱衍生物的新生物模拟方法,该方法采用了一种高效且具有选择性的多米诺反应,该反应由串联的 Knoevenagel-hetero-Diels-Alder-hydrogenation 顺序组成。在醛 27f、1,3-二羰基化合物 28 和烯醇醚 30a 的三组分反应中,得到了 1 : 1 的 31c 和 31d 混合物,收率为 91%,氢化后得到的吲哚生物碱衍生物 35a 属于假系列的单一化合物。同样,27f、28 和 30b 的反应在氢化后也得到 35a 作为唯一的化合物。 在 27e、28 和 30a 的多米诺反应中,生成了正常类型的吲哚生物碱衍生物 36b,产率为 46%。