Ethyl Glyoxylate <i>N</i>-Tosylhydrazone as Sulfonyl-Transfer Reagent in Base-Catalyzed Sulfa-Michael Reactions
作者:Maitane Fernández、Uxue Uria、Lucia Orbe、Jose L. Vicario、Efraím Reyes、Luisa Carrillo
DOI:10.1021/jo402518q
日期:2014.1.3
Ethyl glyoxylate N-tosylhydrazone has been identified as an excellent sulfonyl anion surrogate in the DBU-catalyzed conjugate addition reaction with enones and enals for the synthesis of functionalized sulfones. The reaction proceeds under base-catalyzed conditions and provides a direct access to γ-keto- and γ-hydroxy sulfones in a simple and reliable way through a sulfa-Michael reaction that proceeds