4.7 Article

NBS/DBU-Promoted One-Pot Three-Component Cycloaddition of Malonic Acid Derivatives, Nitrosoarenes, and Alkenes: Synthesis of Isoxazolidines

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JOURNAL OF ORGANIC CHEMISTRY
卷 86, 期 1, 页码 1096-1107

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AMER CHEMICAL SOC
DOI: 10.1021/acs.joc.0c02567

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  1. Natural Science Foundation of Shanxi Province [201601D011028]

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A straightforward synthetic method has been successfully established for the efficient synthesis of highly functionalized isoxazolidine derivatives, with good yields, broad functional group tolerance, and excellent selectivity. The mechanism involves the formation of bromomalonic acid derivatives and the synthesis of nitrone intermediates, demonstrating the key steps in the reaction process.
A general DBU-mediated one-pot three-component cycloaddition reaction of easily accessible malonic acid derivatives, nitrosoarenes, and alkenes has been successfully established with the aid of NBS to provide direct access to highly functionalized isoxazolidine derivatives with generally good to excellent yields, broad functional group tolerance, and excellent regio- and diastereo-selectivities under mild conditions. The mechanism study shows that the NBS-mediated formation of bromomalonic acid derivatives from malonic acid derivatives and DBU-promoted synthesis of nitrone intermediates via the reaction of bromomalonic acid derivatives with nitrosoarenes are key steps.

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