Tandem <i>N</i>,<i>N</i>-Dialkylation Reaction of <i>N</i>-Trimethylsilyl α-Iminoesters Utilizing an Umpolung Reaction and Characteristics of the Silyl Substituent: Synthesis of Pyrrolidine, Piperidine, and Iminodiacetate
with organometallics gave directly N-alkylaminoesters in high yields without the need for removing a protecting group at the nitrogen atom. Efficient syntheses of pyrrolidines, piperidines, and iminodiacetate derivatives were also developed via tandem N,N- or N,C-dialkylation reactions utilizing characteristics of the silyl substituent. Furthermore, under the influence of silica gel, the addition of
Nickel-Catalyzed Alkyl-Alkyl Cross-Couplings of Fluorinated Secondary Electrophiles: A General Approach to the Synthesis of Compounds having a Perfluoroalkyl Substituent
作者:Yufan Liang、Gregory C. Fu
DOI:10.1002/anie.201503297
日期:2015.7.27
to a tertiary carbon atom by using an alkyl–alkyl cross‐coupling. A nickel catalyst derived from NiCl2⋅glyme and a pybox ligand achieves the coupling of a wide range of fluorinated alkyl halides with alkylzinc reagents at roomtemperature. A broad array of functional groups is compatible with the reaction conditions, and highly selective couplings can be achieved on the basis of differing levels of
C- and N-Selective Grignard Addition Reactions of α-Aldimino Esters in the Presence or Absence of Zinc(II) Chloride: Synthetic Applications to Optically Active Azacycles
作者:Manabu Hatano、Kenji Yamashita、Kazuaki Ishihara
DOI:10.1021/acs.orglett.5b00927
日期:2015.5.15
Highly practical synthetic methods were developed for the C- and N-selective Grignard addition reactions of N-4-MeOC6H4-protected α-aldimino esters in the presence or absence of zinc(II) chloride. Diastereoselective C-alkyl addition, tandem C-alkyl addition–N-alkylation, and some transformations to synthetically useful optically active azacycles were demonstrated.
在存在或不存在氯化锌(II)的情况下,开发了高度实用的合成方法,用于N -4-MeOC 6 H 4保护的α-己二酰胺酯的C-和N-选择性格氏试剂加成反应。证明了非对映选择性的C-烷基加成,串联的C-烷基加成-N-烷基化,以及向合成有用的旋光氮杂环化合物的一些转化。
A Simple Route to New Cyclic (Chloroalkyl)phosphane-, Diphosphane-, and Aminophosphane Derivatives
benzothiadiphosphole and, in sequence, a bis-Grignard and a chloroalkyl Grignard reagent has been reported. It produced, after treatment of the crude reaction mixture with elemental sulfur, newchloroalkylcyclic tertiary phosphane sulfides. These compounds have been successfully employed as precursors of new nonsymmetric phosphoamino and diphosphano derivatives.
Conversion of Alkyl Chlorides to Bromides, Selective Reactions of Mixed Bromochloroalkanes, and Halogen Exchange
作者:W. Edward Willy、Dennis R. McKean、Barbara A. Garcia
DOI:10.1246/bcsj.49.1989
日期:1976.7
Primary alkylchlorides are quantitatively converted to their corresponding bromides in the presence of ethyl bromide, N-methyl-2-pyrrolidinone, and a catalytic amount of metal bromide. A variety of chlorides can be converted. Selective functionalization at bromine of several primary bromochloroalkanes was studied in conjunction with the chloride-bromide conversion for multistep syntheses. Methods