Bio‐inspired Total Synthesis of Twelve
<i>Securinega</i>
Alkaloids: Structural Reassignments of (+)‐Virosine B and (−)‐Episecurinol A
作者:Kevin Antien、Aitor Lacambra、Fernando P. Cossío、Stéphane Massip、Denis Deffieux、Laurent Pouységu、Philippe A. Peixoto、Stéphane Quideau
DOI:10.1002/chem.201903122
日期:2019.9.2
isolated principally from subtropical plants belonging to the Phyllanthaceae family. Following a strategy based on alternative hypotheses for their biosynthesis, an easy and time-efficient divergent synthesis enabled access to twelve of those alkaloids featuring (neo)(nor)securinane skeletons. Moreover, this work permitted to reassign the absolute configurations of (+)-virosine B and (-)-episecurinol A
Design and Synthesis of Dimeric Securinine Analogues with Neuritogenic Activities
作者:Genyun Tang、Xin Liu、Nan Ma、Xiaojie Huang、Zhen-Long Wu、Wen Zhang、Ying Wang、Bing-Xin Zhao、Zhen-Ya Wang、Fanny C. F. Ip、Nancy Y. Ip、Wen-Cai Ye、Lei Shi、Wei-Min Chen
DOI:10.1021/acschemneuro.6b00188
日期:2016.10.19
analogue strategy as a successful approach, the current study identifies a series of novel dimeric securinine analogues as potent neurite outgrowth enhancers. Compounds 13, 14, 17–19, and 21–23, with different lengths of carbon chain of N,N-dialkyl substituting diacid amide linker between two securinine molecules at C-15 position, exhibited notable positive effects on both neuronal differentiation and
The photodimerization of both securinine-type and norsecurinine-type alkaloids has been investigated. The dimers of these alkaloids were obtained in a unique form of anti-head-head with high regioselectivity and stereoselectivity. Different reaction conditions were investigated and thermodynamical calculation was also carried out. It is believed that the selective dimer formation is related to the
SmI<sub>2</sub>-Mediated Radical Coupling Strategy to Securinega Alkaloids: Total Synthesis of (−)-14,15-Dihydrosecurinine and Formal Total Synthesis of (−)-Securinine
The asymmetric totalsynthesis of (−)-14,15-dihydrosecurinine and the formal totalsynthesis of (−)-securinine were accomplished starting from an easily available malimide. A concise SmI2-mediated radical couplingstrategy has been developed to construct the bridged α-hydroxy 6-azabicyclo[3.2.1]octanone in four steps with high diastereoselectivity.