
Journal of Organic Chemistry p. 4083 - 4088 (1992)
Update date:2022-08-05
Topics:
Posner, Gary H.
Nelson, Todd D.
Kinter, Chris M.
Johnson, Neil
Captodative 3-(tolylthio)-2-pyrone (1) is shown to be reactive as a nucleophilic diene undergoing 2 + 4-cycloadditions with various electrophilic alkenes under sufficiently mild thermal conditions (= 90 deg C) so that the initial bicyclic lactone adducts can be isolated on gram scale in moderate to very good yields (42-82percent) without loss of CO2.These bicyclic adducts are formed regiospecifically and often with excellent stereoselectivity.These Diels-Alder cycloadditions are the first examples of a captodative unsturated sulfide acting as an enophile.NMR data ((13)C) are presented correlating the electron density in the pyrone diene systems with their Diels-Alder reactivity, and some transformations of the bicyclic lactone adducts are shown to illustrate the value and versatility of these richly functionalized synthetic intermediates.
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