Defluorinative Carboimination of Trifluoromethyl Ketones
作者:Xiaolong Zhang、Yongquan Ning、Zhaohong Liu、Shuang Li、Giuseppe Zanoni、Xihe Bi
DOI:10.1021/acscatal.2c02434
日期:2022.8.5
intramolecular cascade process by integrating successive cleavage of the C–Fbond and formation of C–C and C═N bonds on a single molecule entity, which differs relevantly from the stepwise mechanism of reported carbodefluorination of CF3 groups. Mechanistic studies disclose that silver catalysis plays a critical role, particularly in the stages of C–Fbondcleavage and aza-Claisen rearrangement.
A Simple, Broad-Scope Nickel(0) Precatalyst System for the Direct Amination of Allyl Alcohols
作者:Joseph B. Sweeney、Anthony K. Ball、Philippa A. Lawrence、Mackenzie C. Sinclair、Luke J. Smith
DOI:10.1002/anie.201805611
日期:2018.8.6
inexpensive NiII/Zn couple enables the allylation of primary, secondary, and electron‐deficient amines without the need for glove‐box techniques. Under mild conditions, primary and secondary aliphatic amines react smoothly with a range of allyl alcohols, giving secondary and tertiaryaminesefficiently. This “totally catalytic” method can also be applied to electron‐deficient nitrogen nucleophiles; the
A nickel-catalyzed aminofluoroalkylative cyclization of unactive alkenes with iododifluoromethyl ketones was developed to construct versatile difluoroalkylated Nitrogen-containing heterocycles including aziridines, pyrrolidines and piperidines in moderate to high yields. This method features a broad substrate scope and has been demonstrated on gram scale.