Flow Electrosynthesis of Sulfoxides, Sulfones, and Sulfoximines without Supporting Electrolytes
作者:Nasser Amri、Thomas Wirth
DOI:10.1021/acs.joc.1c00860
日期:2021.11.19
An efficient electrochemical flow process for the selective oxidation of sulfides to sulfoxides and sulfones and of sulfoxides to N-cyanosulfoximines has been developed. In total, 69 examples of sulfoxides, sulfones, and N-cyanosulfoximines have been synthesized in good to excellent yields and with high current efficiencies. The synthesis was assisted and facilitated through a supporting electrolyte-free
<i>N</i>-Imidazolylation of Sulfoximines from<i>N</i>-Cyano Sulfoximines, 1-Alkynes, and<i>N</i>-Sulfonyl Azides
作者:Sanghyuck Kim、Ji Eun Kim、Jinsub Lee、Phil Ho Lee
DOI:10.1002/adsc.201500636
日期:2015.11.16
The rhodium-catalyzed N-imidazolylation of N-sulfonyl-1,2,3-triazoles with a variety of N-cyano sulfoximines has been developed for the synthesis of N-imidazolyl sulfoximines via elimination of molecular nitrogen. Copper-catalyzed [3+2] cycloaddition followed by rhodium-catalyzed N-imidazolylation from 1-alkynes, N-sulfonylazides, and N-cyano sulfoximines is also demonstrated for the synthesis of N-imidazolyl
Anodic Dehydrogenative Cyanamidation of Thioethers: Simple and Sustainable Synthesis of
<i>N</i>
‐Cyanosulfilimines
作者:Martin Klein、Siegfried R. Waldvogel
DOI:10.1002/anie.202109033
日期:2021.10.18
A novel and very simple to perform electrochemical approach for the synthesis of several N-cyanosulfilimines in good to excellent yields was established. This method provides access to biologically relevant sulfoximines by consecutive oxidation using electro-generated periodate. This route can be easily scaled-up to gram quantities. The S,N coupling is carried out at an inexpensive carbon anode by
Access to N-cyanosulfoximines by transition metal-free iminations of sulfoxides
作者:C. A. Dannenberg、L. Fritze、F. Krauskopf、C. Bolm
DOI:10.1039/c6ob02691e
日期:——
transition metal-free synthesis of N-cyanosulfoximines from sulfoxides using N-chlorosuccinimide (NCS) as oxidising agent and cyanamide as nucleophilic amine source is reported. The products are obtained in moderate to excellent yields. The protocol enables an easy access to N-cyanosulfoximines from readily available starting materials under inversion of configuration at a preexisting stereogenic center.
Copper-promoted N-cyanation of aliphatic sec-amine by CuCN is achieved via oxidative coupling. This procedure employs O2 as a clean oxidant. Notably, sulfoximines and 1,1,3,3-tetramethylguanidine also worked well in this procedure. Thus, it represents a key progress in the C–N bond formation reaction as well as in the cyanation reaction.