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Haut, Franz-Lucas; Habiger, Christoph; Speck, Klaus; Wurst, Klaus; Mayer, Peter; Korber, Johannes Nepomuk; Muller, Thomas; Magauer, Thomas (2019): Synthetic Entry to Polyfunctionalized Molecules through the [3+2]-Cycloaddition of Thiocarbonyl Ylides. In: Journal of the American Chemical Society, Vol. 141, No. 34: pp. 13352-13357
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Here we present a comprehensive study on the [3+2]-cycloaddition of thiocarbonyl ylides with a wide variety of alkenes and alkynes. The obtained dihydro- and tetrahydrothiophene products serve as exceptionally versatile intermediates providing access to thiophenes, dienes, dendralenes, and vic-quarternary carbon centers. The use of high-pressure conditions enables thermally unstable, sterically encumbered or moderately reactive substrates to undergo the cycloaddition under mild conditions, thereby increasing the yield by up to 58%. In addition, we showcase its utility by the formal syntheses of the pharmaceuticals NGB 4420 and tenilapine.