Transition‐Metal‐Free Reductive Functionalization of Tertiary Carboxamides and Lactams for α‐Branched Amine Synthesis
作者:Derek Yiren Ong、Dongyang Fan、Darren J. Dixon、Shunsuke Chiba
DOI:10.1002/anie.202004272
日期:2020.7.13
A new method for the synthesis of α‐branched amines by reductive functionalization of tertiary carboxamides and lactams is described. The process relies on the efficient and controlled reduction of tertiary amides by a sodium hydride/sodiumiodide composite, in situ treatment of the resulting anionic hemiaminal with trimethylsilyl chloride and subsequent coupling with nucleophilic reagents including
Primaryamines are prepared by the electrophilic amination of Grignardreagents with 4,4,5,5-tetramethyl-1,3-dioxolan-2-one O-phenylsulfonyloxime and the acidic hydrolysis of the resulting imines. [reaction: see text]
Lewis acid-promoted direct substitution of 2-methoxy-3-cyanopyridines by organo cuprates. Part 3: Facile preparation of nicotinamide and nicotinic acid derivatives
作者:Alaa A.-M. Abdel-Aziz
DOI:10.1016/j.tetlet.2007.02.096
日期:2007.4
various organo cuprates to afford the corresponding 2,4,6-trisubstituted nicotinonitriles. Subsequent hydrolysis of compounds 10 and 11 afforded the corresponding 2,4,6-trisubstituted nicotinicacid 22 and nicotinamide 23 derivatives, respectively. The mechanism of the displacement reaction has been studied experimentally and by molecular modeling calculations.
Sterically Controlled Cu-Catalyzed or Transition-Metal-Free Cross-Coupling of <i>gem</i>-Difluoroalkenes with Tertiary, Secondary, and Primary Alkyl Grignard Reagents
作者:Wenpeng Dai、Hongyan Shi、Xianghu Zhao、Song Cao
DOI:10.1021/acs.orglett.6b02026
日期:2016.9.2
transition-metal-free cross-coupling of gem-difluoroalkenes with tertiary, secondary, and primary alkylGrignardreagents has been developed. Remarkably, the tertiary and secondary alkylation of gem-difluoroalkenes proceeded very smoothly in the presence of 25 mol % of CuCN or under transition-metal-free conditions, affording the tertiary and secondary alkyl-substituted fluoroalkenes in good to excellent yields with
Preparation of Primary Amines by the Copper(I) Catalyzed Reaction of 4,4′-Bis(trifluoromethyl)benzophenone<i>O</i>-Methylsulfonyloxime and Alkyl Grignard Reagents
Primaryamines are prepared by the reaction of 4,4′-bis(trifluoromethyl)benzophenone O-methylsulfonyloxime and alkyl Grignard reagents in the presence of a catalytic amount of CuCN•2LiCl and the successive acid hydrolysis of the resulting N-alkylimine derivatives.