A cobalt-catalyzed synthesis of 1-aminoindenes via enantioselective [3 + 2] annulation is described. In this reaction, the desired products can be selectively prepared in either (R)- or (S)-form by the ligand-controlled synthesis, which is initiated by the cleavage of C–B, C–Br, or C–O bonds under very mild reaction conditions. In addition, this enantioselective cobalt catalysis provides high regioselectivity
Introduction of (2-CF<sub>3</sub>)Phenyl Group via Nickel-catalyzed C-Cl Bond Activation and Arylation
作者:Zheng Peng、Hongjian Sun、Aiqin Du、Xiaoyan Li
DOI:10.1002/zaac.201400609
日期:2015.4
A simple and mild catalytic arylation via C–Cl bond activation is described. The phenylgroup containing a 2-trifluoromethyl group was introduced into the aromatic imine molecules through C,C-coupling reaction between chloroarenes and the organozinc reagent, bis(2-(trifluoromethyl)phenyl)zinc, with tetrakis(trimethylphosphine)nickel(0) complex as an effective catalyst. Under catalytic conditions chlorinated
To produce a novel class of anticancer compounds, an efficient method for synthesizing novel β-lactone and β-lactam frameworks was developed based on the reaction of a new ketene with C=O and C=N bonds. Functionalized 2-azetidinones were efficiently synthesized by employing 2,4-dichlorophenoxylketene, which was generated in situ. The reaction of the ketene with aldehydes was not successful and in all
An oxidative rearrangement of C,N-diarylaldimines to formamides using sodium perborate
作者:Pakawan Nongkunsarn、Christopher A. Ramsden
DOI:10.1016/s0040-4039(00)61698-2
日期:1993.10
Treatment of C,N-diaryladium (5) with sodium tetrahydrate in triflouroacetic acid solution at 70–80°C results in an oxidative rearrangement to N,N-diarylformamides (6(Scheme 1). A mechanism involving the initial formation of 2,3-diaryloxaziridines is proposed (Scheme 2).