Difluoromethylation of N-arylsulfonyl hydrazones with difluorocarbene generated fromdifluoromethylene phosphobetaine (Ph3P+CF2CO2-) to give various difluoromethyl aryl sulfones is described.
Stereoselective Synthesis of <i>trans</i>-Stilbenes through Silver-Catalyzed Self-Coupling of <i>N</i>-Triftosylhydrazones: An Experimental and Theoretical Study
作者:Qingmin Song、Yue Zhao、Shaopeng Liu、Yong Wu、Zhaohong Liu
DOI:10.1021/acs.orglett.3c01040
日期:2023.5.19
efficiency with excellent stereoselectivity, broad substrate scope, and good functional group tolerance. A plausible mechanism involving nucleophilic attack of in situ generated sulfonium ylides on silver carbene was proposed on the basis of experimental results and DFT calculations, which further indicates that π–π stacking interactions play a dominant role in stereoselectivity control.
Rhodium‐Catalyzed Dearomative 1,4‐Acyl Rearrangement of 2‐Oxypyridines with Hydrazones: Access to N‐Substituted 2‐Pyridones
作者:Yifeng Ni、Jiangtao Sun
DOI:10.1002/ejoc.202300368
日期:2023.7.17
A rhodium-catalyzed dearomative 1,4-acyl migratory rearrangement reaction of 2-oxypyridines has been developed for the direct synthesis of N-alkylated 2-pyridones under mild reaction conditions.