β-氨基腈是重要的分子支架。亚胺的氰烷基化是构建这些支架的最直接的方法。在这项研究中,我们报道了通过光敏电子供体-受体复合物实现的自由基偶联实现亚胺的新型氰烷基化。该策略具有条件温和、反应范围广、原子经济性高等特点。该策略的可扩展性和实用性通过 40 g 连续流动系统得到了证明,从中获得了多种重要的药物相关分子。
The reactions of Schiffbases such as N-benzylideneanilines with superoxide ion in acetonitrile under mild conditions gave the cyanomethyl adducts, 3-arylamino-3-arylpropionitriles, as the main products in relatively good yields. In the case of N-(4-nitrobenzylidene)aniline, the adduct was further oxidized to β-anilino-4-nitrocinnamonitrile. No oxidative products such as amides were obtained except
The first transition-metal-free addition of alkyl nitriles to unactivated irnines was developed using a catalytic combination of 4-MeOC6H4CNa and TMSCH2CO2Et to promote the reaction. The corresponding beta-amino nitriles are obtained in good to almost quantitative isolated yields under mild conditions. A mechanism involving an autocatalytic pathway is proposed on the basis of experimental observations.
Dynamic Kinetic Resolution in the Asymmetric Synthesis of β-Amino Acids by Organocatalytic Reduction of Enamines with Trichlorosilane
作者:Andrei V. Malkov、Sigitas Stončius、Kvetoslava Vranková、Matthias Arndt、Pavel Kočovský
DOI:10.1002/chem.200801244
日期:2008.9.19
Elektrokatalytische Cyanomethylierung von Azomethinen: Eine neue Synthese f�r ?-Aminonitrile
作者:U. Hess、A.-K. Raasch、M. Schulze
DOI:10.1002/prac.19923340607
日期:——
Certain Schiff-bases (2 - 7) react in acetonitrile (1) at a Hg-cathode in a new electrocatalyzed cyanomethylation method in good yields without side-products to beta-aminonitriles (2a - 7a). The synthesis is initiated by an electrochemical deprotonation of 1 by azomethine-radical anions in catalytical amount to acetonitril anions (B-). During nucleophilic reaction of B- with 2 - 7 up to its complete consumption, the cyanomethylation synthon B- is regenerated in a cyclic, self-reproducing process. Quantum chemical calculation in context with cyanomethylation product analysis permit mechanistical insights and exact prediction of suitable azomethines and coupling position for B-.
Tin-Mediated Addition of Bromoaceto-Nitrile to Aldimines
作者:Peipei Sun、Yongmin Zhang
DOI:10.1080/00397919708004176
日期:1997.9
In the presence of tin powder, the addition of bromoacetonitrile to aldimines gives beta-amino nitriles in THF. Chlorotrimethylsilane can accelerate the reaction.