The Hancock Alkaloids (-)-Cuspareine, (-)-Galipinine, (-)-Galipeine, and (-)-Angustureine: Asymmetric Syntheses and Corrected 1H and 13C NMR Data.,Journal of Natural Products

当前位置： X-MOL 学术 › J. Nat. Prod. › 论文详情

Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)

The Hancock Alkaloids (-)-Cuspareine, (-)-Galipinine, (-)-Galipeine, and (-)-Angustureine: Asymmetric Syntheses and Corrected 1H and 13C NMR Data.
Journal of Natural Products ( IF 3.3 ) Pub Date : 2018-11-20 , DOI: 10.1021/acs.jnatprod.8b00672
Stephen G Davies ₁ , Ai M Fletcher ₁ , Ian T T Houlsby ₁ , Paul M Roberts ₁ , James E Thomson ₁ , David Zimmer ₁

Affiliation

The asymmetric syntheses of all members of the Hancock alkaloid family based upon a 2-substituted N-methyl-1,2,3,4-tetrahydroquinoline core are delineated. The conjugate addition of enantiopure lithium N-benzyl- N-(α-methyl- p-methoxybenzyl)amide to 5-( o-bromophenyl)- N-methoxy- N-methylpent-2-enamide is used to generate the requisite C-2 stereogenic center of the targets, while an intramolecular Buchwald-Hartwig coupling is used to form the 1,2,3,4-tetrahydroquinoline ring. Late-stage diversification completes construction of the C-2 side chains. Thus, (-)-cuspareine, (-)-galipinine, (-)-galipeine, and (-)-angustureine were prepared in overall yields of 30%, 28%, 15%, and 39%, respectively, in nine steps from commercially available 3-( o-bromophenyl)propanoic acid in all cases. Unambiguously corrected 1H and 13C NMR data for the originally isolated samples of (-)-cuspareine, (-)-galipinine, and (-)-angustureine are also reported, representing a valuable reference resource for these popular synthetic targets.

中文翻译：

汉考克生物碱（-）-Cuspareine，（-）-Galipinine，（-）-Galipeine和（-）-Angustureine：不对称合成以及校正后的1H和13C NMR数据。

描绘了基于2-取代的N-甲基-1,2,3,4-四氢喹啉核心的汉考克生物碱家族的所有成员的不对称合成。将对映体纯的N-苄基锂-N-（α-甲基-对甲氧基苄基）酰胺共轭添加到5-（邻溴苯基）-N-甲氧基-N-甲基戊-2-烯酰胺中以生成必要的C- 2立体定向的目标，而分子内布赫瓦尔德-哈特维格偶联是用来形成1,2,3,4-四氢喹啉环。后期多样化完成了C-2侧链的构建。因此，分九步制备（-）-cuspareine，（-）-galipinine，（-）-galipeine和（-）-angustureine的总产率分别为30％，28％，15％和39％在所有情况下均由市售的3-（邻-溴苯基）丙酸制成。

更新日期：2018-11-20

点击分享查看原文

点击收藏

公开下载

阅读更多本刊新发论文本刊介绍/投稿指南