Synthesis of<i>Aristotelia</i>-type alkaloids. Part VIII. Synthesis of (±)-aristolasicone
作者:Rolf Güller、Markus Dobler、Hans-Jurg Borschberg
DOI:10.1002/hlca.19910740804
日期:1991.12.11
The revised structure of the indole alkaloid aristolasicone (2) was confirmed through a convergent total synthesis of the racemic form of this metabolite. The key step involves a one-pot condensation/cyclization reaction between 1-(4-methoxyphenylsulfonyl)-1H-indole-2-acetaldehyde (9) and (±)-trans-5-(2,6-difluorobenzyloxy)-p-menth-l-en-8-amine ((±)-7). The resulting allohobartine derivative (±)-13
吲哚生物碱马兜铃二酮(2)的修订结构通过该代谢产物的外消旋形式的聚合全合成得到证实。关键步骤涉及1-(4-甲氧基苯基磺酰基)-1 H-吲哚-2-乙醛(9)与(±)-反式-5-(2,6-二氟苄氧基)-p之间的一锅缩合/环化反应-薄荷-1-en-8-胺((±)-7)。将以84%的收率获得的所得别异巴汀衍生物(±)-13脱保护并氧化为(±)-异戊三烯酮((±)-15),在暴露于BF 3时可平滑地环化成目标分子(±)-2 ·的Et 2 O.