Synthesis 2022; 54(19): 4339-4346
DOI: 10.1055/a-1863-3494
paper

DABCO-Catalyzed [3+2] Cycloaddition of Isatin-Derived Nitrones and Electron-Deficient Dienes via a 1,6-Addition Reaction

Zihao Luo
a   Department of Chemistry, Zhejiang Sci-Tech University, Hangzhou, 310018, P. R. of China
,
Zhen Wang
b   School of Pharmaceutical Sciences and Chongqing Key Laboratory of Natural Drug Research, Chongqing University, Chongqing 401331, P. R. of China
,
Weijun Yao
a   Department of Chemistry, Zhejiang Sci-Tech University, Hangzhou, 310018, P. R. of China
› Author Affiliations
We gratefully acknowledge the Natural Science Foundation of Zhejiang Province (Grant LY20B020012, Grant LTZ22B020002), and Fundamental Research Funds for the Central Universities (2022CDJXY-025) for the financial support of this work.


Abstract

Regio-, chemo-, and diastereoselective [3+2] dipolar cycloadditions of isatin-derived nitrone ylides with penta-2,4-dienenitriles have been developed. The reaction proceeds through the organic base DABCO catalyzed 1,6-addition to linear penta-2,4-dienenitriles, followed by the intramolecular cyclization. This procedure is capable of tolerating a relatively wide range of nitrone ylides under mild conditions, facilitating the preparation of various 1′-hydroxyspiro[indoline-3,2′-pyrrolidine] derivatives.

Supporting Information



Publication History

Received: 27 April 2022

Accepted after revision: 27 May 2022

Accepted Manuscript online:
27 May 2022

Article published online:
05 July 2022

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