Microwave assisted 1,3-dipolar cycloaddition reaction of exo-glucal with nitrone
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With microwave irradiation, the efficiency of the 1,3-dipolar cycloaddition of exo-glucal (1) with nitrones 2 was remarkably improved, and the yield of the microwave assisted reaction in a seamless pressure vial at 200 °C for 2 min could be up to 96%, providing a practical and convenient method for preparing spiro-isoxazolidine glycosides which are very important intermediates for synthesizing various C-glycosides possessing functional groups.
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Chinese Journal of Organic Chemistry