Syntheses of (+)-Complanadine A and Lycodine Derivatives by Regioselective [2 + 2 + 2] Cycloadditions
摘要:
The dimeric alkaloid complanadine A has shown promise in regenerative science, promoting neuronal growth by inducing the secretion of growth factors from glial cells. Through the use of tandem, cobalt-mediated [2 + 2 + 2] cycloaddition reactions, two synthetic routes have been developed with different sequences for the formation of the unsymmetric bipyridyl core. The regioselective formation of each of the pyridines was achieved based on the inherent selectivity of the molecules or by reversing the regioselectivity through the addition of Lewis bases. This strategy has been successfully employed to provide laboratory access to complanadine A as well as structurally related compounds possessing the lycocline core.
Concise Total Synthesis of Complanadine A Enabled by Pyrrole-to-Pyridine Molecular Editing
作者:Brandon S. Martin、Donghui Ma、Mingji Dai、Takeru Saito、Katelyn S. Gallagher
DOI:10.1055/a-2107-5159
日期:2024.1
and unsymmetrical dimer of lycodine. Biologically, it is a novel and promising lead compound for the development of new treatments for neurodegenerative disorders and persistent pain management. Herein, we report a concise synthesis of complanadine A using a pyrrole-to-pyridine molecular editing strategy. The use of a nucleophilic pyrrole as the precursor of the desired pyridine enabled an efficient
2000 年分离的石松生物碱 complanadine A 是石松的复杂且不对称的二聚体。从生物学上讲,它是一种新颖且有前途的先导化合物,可用于开发神经退行性疾病和持续性疼痛管理的新疗法。在此,我们报道了使用吡咯-吡啶分子编辑策略的 complanadine A 的简洁合成。使用亲核吡咯作为所需吡啶的前体,实现了planadine A和石蒜碱的四环核心骨架的高效和一锅构建。吡咯基团通过 Ciamician-Dennstedt 单碳环扩展转化为 3-氯吡啶。随后 3-氯吡啶和吡啶 N-氧化物之间的 C-H 芳基化形成不对称二聚体,然后将其推进到planadine A。总体而言,从现成的已知化合物中,planadine A 的总合成是通过 11 个步骤实现的。吡咯-吡啶分子编辑策略使我们能够显著提高整体合成效率。此外,正如 Suzuki-Miyaura 交叉偶联所证明的那样,来自 Ciamician-Dennstedt
One-Carbon Insertion and Polarity Inversion Enabled a Pyrrole Strategy to the Total Syntheses of Pyridine-Containing <i>Lycopodium</i> Alkaloids: Complanadine A and Lycodine
作者:Donghui Ma、Brandon S. Martin、Katelyn S. Gallagher、Takeru Saito、Mingji Dai
DOI:10.1021/jacs.1c08626
日期:2021.10.13
management. Herein we report a pyrrolestrategy enabled by one-carbon insertion and polarity inversion for concise total syntheses of complanadine A and lycodine. The use of a pyrrole as the pyridine precursor allowed the rapid construction of their tetracyclic skeleton via a one-pot Staudinger reduction, amine-ketone condensation, and Mannich-type cyclization. The pyrrole group was then converted to
Complanadine A 和 Lycodine 是石松属生物碱的代表成员,具有特征性的含吡啶四环骨架。 Complanadine A 已被证明具有良好的神经营养活性和治疗持续性疼痛的潜力。在此,我们报告了一种通过单碳插入和极性反转实现吡咯策略,用于简明全合成complanadine A和lycodine。使用吡咯作为吡啶前体可以通过一锅施陶丁格还原、胺酮缩合和曼尼希型环化快速构建其四环骨架。然后通过一碳插入过程进行 Ciamician-Dennstedt 重排,将吡咯基团转化为所需的吡啶,同时在 C3 处引入氯化物以进行下一个 C-H 芳基化。其他关键步骤包括直接反马尔可夫尼科夫氢叠氮化、Mukaiyama-Michael 加成和 Paal-Knorr 吡咯合成。 Lycodine 和 compladine A 分别由容易获得的已知化合物通过 8 步和 11 步制备而成。
Syntheses of (+)-Complanadine A and Lycodine Derivatives by Regioselective [2 + 2 + 2] Cycloadditions
作者:Changxia Yuan、Chih-Tsung Chang、Dionicio Siegel
DOI:10.1021/jo400695c
日期:2013.6.7
The dimeric alkaloid complanadine A has shown promise in regenerative science, promoting neuronal growth by inducing the secretion of growth factors from glial cells. Through the use of tandem, cobalt-mediated [2 + 2 + 2] cycloaddition reactions, two synthetic routes have been developed with different sequences for the formation of the unsymmetric bipyridyl core. The regioselective formation of each of the pyridines was achieved based on the inherent selectivity of the molecules or by reversing the regioselectivity through the addition of Lewis bases. This strategy has been successfully employed to provide laboratory access to complanadine A as well as structurally related compounds possessing the lycocline core.