FeCl<sub>3</sub>/TMSCl:
An Effective Catalytic System for the Conjugate Addition of Sodium <i>p</i>-Toluenesulfinate to α,β-Enones
作者:B. Sreedhar、M. Reddy、P. Reddy
DOI:10.1055/s-2008-1077967
日期:——
A new protocol for the β-sulfonation of α,β-unsaturated carbonyl compounds is described. The method employs FeCl3 as catalyst and TMSCl as additive for conjugate addition of sodium p-toluenesulfinate to enones.
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
Enantioselective Sulfonation of Enones with Sulfonyl Imines by Cooperative N-Heterocyclic-Carbene/Thiourea/Tertiary-Amine Multicatalysis
作者:Zhichao Jin、Jianfeng Xu、Song Yang、Bao-An Song、Yonggui Robin Chi
DOI:10.1002/anie.201305023
日期:2013.11.18
make light work: In an organocatalytic asymmetric sulfonation of enones, the activation of a sulfonylimine by an N‐heterocyclic carbene (NHC) catalyst led to the release of a sulfinic anion, which underwent nucleophilicaddition to the enone. The enantioselectivity of the process was controlled by a chiral thiourea/amine co‐catalyst through anion recognition and hydrogen‐bonding interactions. Tol=p‐tolyl