Diastereoselective Monofluorocyclopropanation Using Fluoromethylsulfonium Salts
作者:Renate Melngaile、Arturs Sperga、Kim K. Baldridge、Janis Veliks
DOI:10.1021/acs.orglett.9b02867
日期:2019.9.6
Diarylfluoromethylsulfoniumsalts, alternatives to freons or advanced fluorinated building blocks, are bench stable and easy-to-use sources of direct fluoromethylene (:CHF) transfer to alkenes. These salts enabled development of a trans-selective monofluorinated Johnson-Corey-Chaykovsky reaction with vinyl sulfones or vinyl sulfonamides to access synthetically challenging monofluorocyclopropane scaffolds
Kinetics of the nucleophilic addition of some aromatic thiols to aryl vinyl sulphones
作者:P. De Maria、A. Fini
DOI:10.1039/j29710002335
日期:——
The rate of addition of aromatic thiols to aryl vinyl sulphones was measured in 1 : 1 (v/v) aqueous ethanol at 25°C. The reaction is kinetically of the second order, being of first order with respect to the sulphone and to the thiolate anion; the latter is the only active nucleophile. The nucleophilic behaviour of thiolate anions in this reaction is briefly compared with that in the nucleophilic substitution
accessible sodiumformate as C1-source and K2S2O8 as reagent, a set of vinylsulfone substrates could be efficiently hydrocarboxylated in aqueous medium without any additional catalyst or reagent; and the concept could be also applied for direct hydroacylations, hydroalkylations and hydrophosphorylations. The control experiments clearly indicated that the reaction proceeds via radical mechanism without
我们报告了一种可见光介导的乙烯砜衍生物自由基加氢羧化方法。使用廉价易得的甲酸钠作为C1源,K 2 S 2 O 8作为试剂,一组乙烯基砜底物可以在水介质中有效地加氢羧化,无需任何额外的催化剂或试剂;该概念也可应用于直接加氢酰化、加氢烷基化和加氢磷酸化。对照实验清楚地表明该反应通过自由基机制进行,没有生成电子供体-受体(EDA)复合物;支持K 2 S 2 O 8原位引发的工作模型形成CO 2自由基阴离子。
De Maria,P.; Fini,A., Journal of the Chemical Society. Perkin transactions II, 1973, p. 1773 - 1776