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.
organic dye eosin Y bis(tetrabutylammonium salt) as photocatalyst, and diisopropylethylamine as reducing agent. Mechanistic studies demonstrate that oxidative quenching of the excited eosin Y by -arylketosulfones plays a crucial role in the present photoredox catalytic cycle.
通过使用 3-W 蓝光 LED 灯、1 mol% 有机染料伊红 Y 双(四丁基铵盐)作为光催化剂和二异丙基乙胺作为还原剂,-芳基酮砜的脱磺酰化取得了良好的产率。机理研究表明,-芳基酮砜对激发的曙红 Y 的氧化猝灭在目前的光氧化还原催化循环中起着至关重要的作用。
Iodine-catalysed sp<sup>3</sup> C–H sulfonylation to form β-dicarbonyl sulfones with sodium sulfinates