4.7 Article

Dearomative tandem annulation to access chiral indoline-fused bicyclo[2.2.2]octanes using modularly designed organocatalysts

Journal

ORGANIC CHEMISTRY FRONTIERS
Volume 10, Issue 5, Pages 1237-1244

Publisher

ROYAL SOC CHEMISTRY
DOI: 10.1039/d2qo01859d

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In this study, an asymmetric dearomative tandem annulation between 3-nitroindoles and 7-oxo-5-heptenals was described. The cascade reactions proceeded smoothly using modularly designed organocatalysts self-assembled from cinchona-squaramide and d-proline. As a result, a collection of enantioenriched indoline-fused bicyclo[2.2.2]octanes featuring six vicinal stereocenters were smoothly obtained in good yields with excellent enantioselectivities (up to >99% ee). This protocol provides an economical and practical approach for the asymmetric synthesis of structurally complex indolines.
Herein, we describe an asymmetric dearomative tandem annulation between 3-nitroindoles and 7-oxo-5-heptenals. The cascade reactions proceeded smoothly using modularly designed organocatalysts self-assembled from cinchona-squaramide and d-proline. As a result, a collection of enantioenriched indoline-fused bicyclo[2.2.2]octanes featuring six vicinal stereocenters were smoothly obtained in good yields with excellent enantioselectivities (up to >99% ee). This protocol provides an economical and practical approach for the asymmetric synthesis of structurally complex indolines.

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