Total Synthesis of the <i>N</i>,<i>C</i>-Coupled Naphthylisoquinoline Alkaloids Ancistrocladinium A and B and Related Analogues
作者:Gerhard Bringmann、Tanja Gulder、Barbara Hertlein、Yasmin Hemberger、Frank Meyer
DOI:10.1021/ja9097687
日期:2010.1.27
activities, have been synthesized via a short sequence of eight linear steps, without the need of protecting groups. Key steps were a Buchwald-Hartwig amination and a Bischler-Napieralski cyclization, preferentially leading to the naturally predominant M-atropo-diastereomer in the case of 3, while the N,C-axis is configurationally semistable in 4. The highly convergent first access to this type of alkaloids
N,C-偶联萘基二氢异喹啉生物碱 ancistrocladinium A (3) 和 B (4) 具有前所未有的亚胺-芳基轴并显示出高体外抗利什曼病活性,已通过八个线性步骤的短序列合成,无需保护组。关键步骤是 Buchwald-Hartwig 胺化和 Bischler-Napieralski 环化,在 3 的情况下优先导致自然占优势的 M-atropo-非对映异构体,而 N,C 轴在 4 中是构型半稳定的。 高度收敛的第一次访问这种类型的生物碱现在将有助于制备用于构效关系研究的结构类似物。它的普遍适用性通过制备空间上更加拥挤的、目前尚不自然的 N,3'-和 N,1'-偶联类似物来证明,