Synthesis of α-amino nitriles through Strecker reaction of aldimines and ketoimines by using nanocrystalline magnesium oxide
摘要:
Strecker reactions of various aldimines as well as ketoimines with TMSCN proceeded smoothly under mild conditions to give the corresponding alpha-amino nitriles and alpha,alpha-disubstituted alpha-amino nitriles, respectively, in good to excellent yields in the presence of nanocrystalline magnesium oxide. The reaction proceeds through hypervalent silicate species by coordination to O2-/O- (Lewis basic site) of nanocrystalline magnesium oxide, proved by Si-29 NMR. (C) 2008 Elsevier Ltd. All rights reserved.
A highly efficient procedure for the preparation of N-sulfonylimines via condensation of sulfonamides with aldehydes as well as ketones in the presence of triarylmethyl chlorides as metal-free organo-catalysts at 40 °C is described. The advantages of this class of catalysts over the reported ones are their efficiency and possibility of running reactions in neutral media that makes them suitable for