Oxysulfonylation of Alkenes with Sulfonyl Hydrazides under Transition-Metal-Free Conditions
作者:Congrong Liu、Lianghui Ding、Guang Guo、Weiwei Liu
DOI:10.1002/ejoc.201501613
日期:2016.2
A novel method to synthesise β-keto sulfones is demonstrated by Bronsted acid promoted oxysulfonylation of alkenes with sulfonyl hydrazides under transition-metal-free conditions. The reaction selectively affords structurally diverse β-keto sulfones in good to excellent yields in a 9:1 mixture of acetonitrile/water.
Switching of Sulfonylation Selectivity by Nature of Solvent and Temperature: The Reaction of β-Dicarbonyl Compounds with Sodium Sulfinates under the Action of Iron-Based Oxidants
作者:Olga M. Mulina、Dmitry A. Pirgach、Gennady I. Nikishin、Alexander O. Terent'ev
DOI:10.1002/ejoc.201900258
日期:2019.7.14
The selectivity of sulfonylation of β‐keto esters with sodium sulfinates under the action of iron(III) can be regulated by the solvent nature and reaction temperature. As a result, α‐sulfonyl β‐keto esters or α‐sulfonyl esters can be selectively obtained. Application of β‐diketones as starting materials gives only α‐sulfonyl ketones.
Chemoselective one-pot synthesis of β-keto sulfones from ketones
作者:Vikas S. Rawat、Perla L. M. Reddy、Bojja Sreedhar
DOI:10.1039/c3ra45547e
日期:——
A practical method to synthesize substituted β-keto sulfones directly from ketones at room temperature has been developed. This method involves the nucleophilic addition of a base generated enolate to sulfonyl iodide. The reaction shows high chemoselectivity for the addition of a sulfonyl group to an α-carbon over a hydroxyl group. In addition, the given protocol provides good to excellent yields of β-keto sulfones under mild reaction conditions. Moreover, the regiochemical aspect of the protocol is also explored.