Volume 60, Issue 39 pp. 21486-21493
Research Article

Organocatalytic Enantioselective Construction of Chiral Azepine Skeleton Bearing Multiple-Stereogenic Elements

Shengli Huang

Shengli Huang

Chongqing Key Laboratory of Natural Product Synthesis and Drug Research, Chemical Biology Research Center, School of Pharmaceutical Sciences, Chongqing University, Chongqing, 401331 P. R. China

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Haojun Wen

Haojun Wen

Chongqing Key Laboratory of Natural Product Synthesis and Drug Research, Chemical Biology Research Center, School of Pharmaceutical Sciences, Chongqing University, Chongqing, 401331 P. R. China

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Yuhong Tian

Yuhong Tian

Chongqing Key Laboratory of Natural Product Synthesis and Drug Research, Chemical Biology Research Center, School of Pharmaceutical Sciences, Chongqing University, Chongqing, 401331 P. R. China

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Pengfei Wang

Pengfei Wang

Chongqing Key Laboratory of Natural Product Synthesis and Drug Research, Chemical Biology Research Center, School of Pharmaceutical Sciences, Chongqing University, Chongqing, 401331 P. R. China

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Wenling Qin

Wenling Qin

Chongqing Key Laboratory of Natural Product Synthesis and Drug Research, Chemical Biology Research Center, School of Pharmaceutical Sciences, Chongqing University, Chongqing, 401331 P. R. China

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Prof. Dr. Hailong Yan

Corresponding Author

Prof. Dr. Hailong Yan

Chongqing Key Laboratory of Natural Product Synthesis and Drug Research, Chemical Biology Research Center, School of Pharmaceutical Sciences, Chongqing University, Chongqing, 401331 P. R. China

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First published: 08 July 2021
Citations: 79

Graphical Abstract

An organocatalytic enantioselective method for the preparation of polychiral molecules via vinylidene ortho-quinone methide (VQM)-mediated intramolecular electrophilic aromatic substitution was developed. With this methodology, four types of stereogenic elements including chiral nitrogen center, C−N axial chirality, C−C axial chirality and conformational behavior of the seven-membered ring were stereoselectively constructed.

Abstract

Enantioselective construction of molecules bearing multiple stereogenic elements is increasingly related to the synthesis of enantiopure natural products, pharmaceuticals, and functional materials. However, atom-economical and enantioselective approaches to install multiple stereogenic elements in a small molecular template by limited chemical transformation remain challenging. We describe an organocatalytic enantioselective method for the preparation of polychiral molecules bearing four types of stereogenic elements in fused azepines via vinylidene ortho-quinone methide (VQM)-mediated intramolecular electrophilic aromatic substitution. This method was proved robust with a wide range of substrate scope (46–92 % yield), with excellent diastereoselectivity (>20:1 dr) and enantioselectivity achieved (up to 97 % ee). Optical properties and Ru3+-induced fluorescence responses of these compounds suggest their potential applications in optoelectronic materials and heavy metal ion detection.

Conflict of interest

The authors declare no conflict of interest.

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