Stereocontrolled synthesis of highly fun
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Gary H. Posner; Todd D. Nelson
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Article
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1990
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Elsevier Science
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French
β 861 KB
A convenient and mild thermal procedure has been developed for stereoselective 2+4-cycloadditions of electron-rich 1,2-dioxygenated olefins 7 to electron-deficient 3-sulfonyl-2-pyrone 6 allowing isolation of the structurally and stereochemically rich initial bicyclic adducts 8. These bicyclic adduct