Photoredox-Catalyzed Intramolecular Aminodifluoromethylation of Unactivated Alkenes
作者:Zuxiao Zhang、Xiaojun Tang、Charles S. Thomoson、William R. Dolbier
DOI:10.1021/acs.orglett.5b01616
日期:2015.7.17
A photoredox catalyzed aminodifluoromethylation of unactivated alkenes has been developed in which HCF2SO2Cl is used as the HCF2 radical source. Sulfonamides were active nucleophiles in the final step of a tandem addition/oxidation/cyclization process to form pyrrolidines, and esters were found to cyclize to form lactones. Thus, a variety of pyrrolidines and lactones were obtained in moderate to excellent
已经开发出未活化的烯烃的光氧化还原催化的氨基二氟甲基化,其中HCF 2 SO 2 Cl用作HCF 2自由基源。在串联加成/氧化/环化过程的最后步骤中,磺酰胺是活性亲核试剂,以形成吡咯烷,发现酯可环化以形成内酯。因此,以中等至优异的产率获得了各种吡咯烷和内酯。为了使环化反应有效,铜催化剂(Cu(dap)2 Cl)和碳酸银的组合对于抑制竞争的氯二氟烷基化过程至关重要。
Palladium/Xu-Phos-catalyzed asymmetric carboamination towards isoxazolidines and pyrrolidines
An efficient palladium-catalyzedenantioselective carboamination reaction of N-Boc-O-homoallyl-hydroxylamines and N-Boc-pent-4-enylamines with aryl or alkenyl bromides was developed, delivering various substituted isoxazolidines and pyrrolidines in good yields with up to 97% ee. The reaction features mild conditions, general substrate scope and scalability. The obtained products can be transformed
Chemoselective Alkene Hydrosilylation Catalyzed by Nickel Pincer Complexes
作者:Ivan Buslov、Jeanne Becouse、Simona Mazza、Mickael Montandon‐Clerc、Xile Hu
DOI:10.1002/anie.201507829
日期:2015.11.23
Chemoselective hydrosilylation of functionalized alkenes is difficult to achieve using base‐metal catalysts. Reported herein is that well‐defined bis(amino)amide nickel pincer complexes are efficient catalysts for anti‐Markovnikov hydrosilylation of terminal alkenes with turnover frequencies of up to 83 000 per hour and turnover numbers of up to 10 000. Alkenes containing amino, ester, amido, ketone
Use of Aryl Chlorides as Electrophiles in Pd-Catalyzed Alkene Difunctionalization Reactions
作者:Brandon R. Rosen、Joshua E. Ney、John P. Wolfe
DOI:10.1021/jo100344k
日期:2010.4.16
The development of conditions that allow use of inexpensive aryl chlorides as electrophiles in Pd-catalyzedalkenecarboamination and carboetherification reactions is described. A catalyst composed of Pd(OAc)2 and S-Phos minimizes N-arylation of the substrate and prevents formation of mixtures of regioisomeric products. A number of heterocycles, including pyrrolidines, isoxazolidines, tetrahydrofurans
Room Temperature Palladium-Catalyzed Intramolecular Hydroamination of Unactivated Alkenes
作者:Forrest E. Michael、Brian M. Cochran
DOI:10.1021/ja060126h
日期:2006.4.5
A mild and facile Pd-catalyzed intramolecular hydroamination of unactivated alkenes is described. This reaction takes place at roomtemperature and is tolerant of synthetically useful acid-sensitive functional groups. The formation of hydroamination products rather than oxidative amination products is due to the use of a tridentate ligand on Pd which effectively inhibits beta-hydride elimination.