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。
Safe and Metal-Free Synthesis of 1-Alkenyl Aryl Sulfides and Their Sulfones from Thiiranes and Diaryliodonium Salts
作者:Jiaxi Xu、Jun Dong
DOI:10.1055/s-0036-1591559
日期:2018.6
These sulfides were further oxidized with performic acid to the corresponding sulfones. The current method provides a metal-free and safe method for the preparation of 1-alkenyl aryl sulfides and their sulfones. A series of 1-alkenyl aryl sulfides was synthesized from thiiranes and diaryliodonium salts in tetrahydrofuran in the presence of potassium tert-butoxide. The proposed reaction mechanism involves
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
In Situ Generation of Unstable Difluoromethylphosphonate-Containing Diazoalkanes and Their Use in [3 + 2] Cycloaddition Reactions with Vinyl Sulfones
作者:Haibo Mei、Li Wang、Romana Pajkert、Qian Wang、Jingcheng Xu、Jiang Liu、Gerd-Volker Röschenthaler、Jianlin Han
DOI:10.1021/acs.orglett.1c00150
日期:2021.2.5
diazoalkanes with vinyl sulfones under simple reaction conditions is developed, which provides an efficient route toward functionalized fluorinated pyrazolines derivatives in good chemical yields. The difluoro diazoalkanes are generated in situ using t-BuONO for the diazotization of (β-amino-α,α-difluoroethyl)phosphonates, and their stabilities and reactivities were carefully investigated.
N-Iminopyridinium Compounds in Giese Reaction: Photoinduced Homolytic N–N and C–C Bond Cleavage for Cyanoalkyl Radical Generation
作者:Gyuri Han、Jihyun You、Junhyeon Choi、Eun Joo Kang
DOI:10.1021/acs.orglett.4c00565
日期:2024.3.29
photoinduced cyanoalkyl radical addition methodology using N-iminopyridinium reagents derived from cyclic ketones. Mechanistic investigations reveal the association of the excited Hantzsch ester and iminopyridinium with pyridyl radical generation. The ensuing cascade involving homolytic N–N bond and C–C bondcleavage of the pyridyl radical ultimately leads to the formation of cyanoalkyl radical species, leading