Organocatalytic cycloaddition of alkynylindoles with azonaphthalenes for atroposelective construction of indole-based biaryls.

Organocatalytic cycloaddition of alkynylindoles with azonaphthalenes for atroposelective construction of indole-based biaryls.
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炔基吲哚与偶氮萘的有机催化环加成用于选择性构建吲哚基联芳基化合物

DOI:
10.1038/s41467-022-28211-0
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发表时间:
2022-02-02
影响因子:
16.6
通讯作者:
Zhou L
Zhou L
中科院分区:
综合性期刊1区
文献类型:
--
作者:
Yang H;Sun HR;He RQ;Yu L;Hu W;Chen J;Yang S;Zhang GG;Zhou L

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轴向手性吲哚-芳基基序存在于天然产物和生物活性化合物以及手性配体中。自主选择性吲哚合成是合成吲哚类联芳化合物的有效方法。本文报道了手性磷酸催化的3-炔基吲哚与偶氮萘的不对称环加成反应。合成了一类吲哚类联芳化合物,产率和对映选择性均较高(产率高达98%,ee值99%)。控制实验和DFT计算说明了一种可能的机制,其中反应进行通过吲哚的脱芳构化生成的丙二烯-亚胺中间体,然后通过分子内氮杂迈克尔加成。该方法为轴手性杂联芳基骨架的对映选择性构建提供了一种收敛的合成策略。在天然产物中发现的轴向手性化合物的催化对映选择性构建的方法有很大的兴趣。在这里,作者开发了一种环加成策略,通过手性磷酸催化的环加成反应,选择性地构建基于吲哚的联芳基化合物。
The axially chiral indole-aryl motifs are present in natural products and biologically active compounds as well as in chiral ligands. Atroposelective indole formation is an efficient method to construct indole-based biaryls. We report herein the result of a chiral phosphoric acid catalyzed asymmetric cycloaddition of 3-alkynylindoles with azonaphthalenes. A class of indole-based biaryls were prepared efficiently with excellent yields and enantioselectivities (up to 98% yield, 99% ee). Control experiment and DFT calculations illustrate a possible mechanism in which the reaction proceeds via a dearomatization of indole to generate an allene-iminium intermediate, followed by an intramolecular aza-Michael addition. This approach provides a convergent synthetic strategy for enantioselective construction of axially chiral heterobiaryl backbones. There is great interest in methods for catalytic enantioselective construction of axially chiral compounds found in natural products. Here, the authors develop a cycloaddition strategy for atroposelective construction of indole-based biaryls via chiral phosphoric acid-catalysed cycloaddition.
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