Collective synthesis of several 2,7′-cyclolignans and their correlation by chemical transformations
作者:Yu Peng、Zhen-Biao Luo、Jian-Jian Zhang、Long Luo、Ya-Wen Wang
DOI:10.1039/c3ob41672k
日期:——
Collective synthesis of anti-malarial 2,7′-cyclolignans has been stereoselectively achieved employing (±)-cyclogalgravin (2) as a linchpin through a series of functional group conversions, including redox reactions. Interestingly, 2 can be correlated with the neolignan (±)-kadangustin J (1) isolated from a different plant source, through a highly efficient dehydrative cyclization reaction with excellent
通过一系列官能团转化(包括氧化还原反应),利用(±)-环没食子糖蛋白(2)作为关键物质,已经立体选择性地实现了抗疟疾2,7'-环木脂素的集体合成。有趣的是,通过高效的脱水环化反应以及藜芦基团的出色的非对映异构性分化和伴随的C1-C7键构建,可以将2与从不同植物来源分离得到的新木脂素(±)-kadangustin J(1)相关联。值得注意的是,stereodivergent的第一全合成(±)-8,8'-外延-aristoligone(5),(±)-8'-外延-aristoligone(7),(±)-8'-外延证实了-8-OH-马兜铃酮(8)和(±)-8'- epi-马兜铃酚(9)。