Synthesis of Iminonitriles by Oxone/TBAB-Mediated One-Pot Oxidative Three-Component Strecker Reaction
摘要:
Oxidative three-component reaction of aldehydes, amines, and TMSCN in a biphasic solvent system (toluene/H2O) containing Oxone, tetra-n-butylammonium bromide (TBAB) and sodium bicarbonate afforded alpha-iminonitriles in good to excellent yields. This oxidative Strecker reaction was applicable to a wide range of aldehydes and amines, aromatic or aliphatic, of different electronic and steric properties. Substituted 1-aza-2-cyano-1,3-dienes were also accessible using alpha,beta-unsaturated aldehydes as inputs.
Rh(III) catalysts have played increasingly important roles in the activation of C–H bonds to build heterocyclic scaffolds. However, there are few reports on the more challenging synthesis of pharmaceutically important 2H-isoindoles and fused 2H-isoindoles. The process reported herein is an effective strategy to produce 2H-isoindole or fused 2H-isoindole derivatives via a Rh(III)-catalyzed transformation