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Current Organocatalysis

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ISSN (Print): 2213-3372
ISSN (Online): 2213-3380

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Research Article

Organocatalytic Regioselective [3+2] Annulation of Morita-Baylis-Hillman Carbonates with Azonaphthalenes: An Efficient Access to 3-Spiropyrazole- 2-oxindoles

Author(s): Yuyu Cheng, Zhongyue Lu and Pengfei Li*

Volume 7, Issue 2, 2020

Page: [134 - 139] Pages: 6

DOI: 10.2174/2213337206666191125094216

Price: $65

Abstract

Background: A cheap and commercially available organocatalyst, 4-dimethylaminopyridine was successfully employed in the regioselective [3+2] cycloaddition of isatin-derived Morita-Baylis- Hillman carbonates with azonaphthalenes for the construction of 3-spiropyrazole-2-oxindoles in excellent yields under mild conditions.

Methods: In the presence of 4-dimethylaminopyridine with a loading of 10 mol%, a series of isatinderived Morita-Baylis-Hillman carbonates reacted smoothly with azonaphthalenes in dichloromethane at room temperature to furnish 3-spiropyrazole-2-oxindoles in 72-98% yield.

Results and Conclusion: In summary, we have developed reasonably cheap and commercially available 4-dimethylaminopyridine-mediated regioselective [3+2] annulations between isatin-derived Morita- Baylis-Hillman carbonates and azonaphthalenes for the construction of 3-spiropyrazole-2-oxindoles under mild conditions.

Keywords: Annulation, azonaphthalenes, MBH carbonates, 4-dimethylaminopyridine, regioselective, spirooxindole.

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