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Preparation of N-(2-alkoxyvinyl)sulfonamides from N-tosyl-1,2,3-triazoles and Subsequent Conversion to Substituted Phthalans and Phenethylamines
Published on: January 3, 2018
Entering the leinamycin rearrangement via 2-(trimethylsilyl)ethyl sulfoxides
1Department of Chemistry and Biochemistry, University of Missouri-Columbia, Columbia, MO 65211, USA.
Abstract:
Attack of cellular thiols on the antitumor natural product leinamycin is believed to generate a sulfenate intermediate that undergoes subsequent rearrangement to a DNA-alkylating episulfonium ion. Here, 2-(trimethylsilyl)ethyl sulfoxides were employed in a fluoride-triggered generation of sulfenate anions related to the putative leinamycin-sulfenate. The resulting sulfenates enter smoothly into a leinamycin-type rearrangement reaction to afford an episulfonium ion alkylating agent. The results provide evidence that the sulfenate ion is, indeed, a competent intermediate in the leinamycin rearrangement. Further, the molecules examined here may provide a foundation for the design of functional leinamycin analogues that bypass the unstable and synthetically challenging 1,2-dithiolan-3-one 1-oxide moiety found in the natural product.
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