Elektrokatalytische Cyanomethylierung von Azomethinen: Eine neue Synthese f�r ?-Aminonitrile
摘要:
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-.
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-.