Issue 9, 2021

Box-copper catalyzed asymmetric inverse-electron-demand oxa-hetero-Diels–Alder reaction for efficient synthesis of spiro pyranyl-oxindole derivatives

Abstract

Spiro oxindole-pyran backbones are structural motifs widely occurring in natural products and bioactive synthetic compounds. In this paper, we present the asymmetric catalytic synthesis of three series of spirooxindole-pyran derivatives via an inverse-electron-demand oxa-hetero-Diels–Alder (IEDDA) reaction in the presence of 2.5–10 mol% of chiral bisoxazoline/copper(II) complexes as Lewis acid catalysts. Under mild reaction conditions, the IEDDA reactions of isatin-derived β,γ-unsaturated α-ketoesters with some dienophiles, such as 2,3-dihydrofuran, 3,4-dihydro-2H-pyran and ortho-vinylphenols, respectively, furnished the corresponding chiral spiro oxindole-pyrans in excellent yields with excellent diastereo- and enantioselectivities.

Graphical abstract: Box-copper catalyzed asymmetric inverse-electron-demand oxa-hetero-Diels–Alder reaction for efficient synthesis of spiro pyranyl-oxindole derivatives

Supplementary files

Article information

Article type
Research Article
Submitted
11 Nov 2020
Accepted
25 Feb 2021
First published
26 Feb 2021

Org. Chem. Front., 2021,8, 2009-2018

Box-copper catalyzed asymmetric inverse-electron-demand oxa-hetero-Diels–Alder reaction for efficient synthesis of spiro pyranyl-oxindole derivatives

N. Li, B. Sun, J. Chen, H. Yang, B. Wang, J. Yu, X. Wang and Z. Wang, Org. Chem. Front., 2021, 8, 2009 DOI: 10.1039/D0QO01407A

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