Enantioselective polyene cyclization via organo-SOMO catalysis.

Enantioselective polyene cyclization via organo-SOMO catalysis.
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DOI:
10.1021/ja100185p
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发表时间:
2010-04-14
影响因子:
15
通讯作者:
MacMillan, David W. C.
MacMillan, David W. C.
中科院分区:
化学1区
文献类型:
--
作者:
Rendler, Sebastian;MacMillan, David W. C.

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第一个有机催化对映选择性自由基多环化是使用单占据分子轨道(SOMO)催化完成的。该策略依赖于多烯醛与咪唑烷酮催化剂、使用合适的铜(II)氧化剂缩合形成的手性烯胺的选择性单电子氧化。该反应在室温弱酸性条件下进行,并显示出与一系列贫电子和富电子官能团的相容性。通过自由基芳基化终止,随后进行氧化和重新芳构化,获得了一系列多环醛(12个例子,54-77%产率,85-93%ee)。描述了在单个催化剂控制的级联中最多六个新碳环的对映选择性形成。一系列实验结果表明了基于自由基的级联机制的证据。
The first organocatalytic enantioselective radical polycyclization has been accomplished using singly occupied molecular orbital (SOMO) catalysis. The presented strategy relies on a selective single-electron oxidation of chiral enamines formed by condensation of polyenals with an imidazolidinone catalyst employing a suitable copper(II) oxidant. The reaction proceeds under mildly acidic conditions at room temperature and shows compatibility with an array of electron-poor as well as electron-rich functional groups. Upon termination by radical arylation, followed by subsequent oxidation and rearomatization, a range of polycyclic aldehydes has been accessed (12 examples, 54-77% yield, 85-93% ee). The enantioselective formation of up to six new carbocycles in a single catalyst-controlled cascade is described. Evidence for a radical-based cascade mechanism is indicated by a series of experimental results.
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