Asymmetric Cyanation of Aldehydes, Ketones, Aldimines, and Ketimines Catalyzed by a Versatile Catalyst Generated from Cinchona Alkaloid, Achiral Substituted 2,2′-Biphenol and Tetraisopropyl Titanate
Full investigation of cyanation of aldehydes, ketones, aldimines and ketimines with trimethylsilyl cyanide (TMSCN) or ethyl cyanoformate (CNCOOEt) as the cyanide source has been accomplished by employing an in situ generated catalyst from cinchona alkaloid, tetraisopropyl titanate [Ti(OiPr)4] and an achiral modified biphenol. With TMSCN as the cyanide source, good to excellent results have been achieved
N-Tosyl-α-aminonitriles have been synthesised by a Strecker reaction of various N-tosyl aldimines with trimethylsilyl cyanide in the presence of catalytic amount of Amberlyst-15 polymer at room temperature under heterogeneous conditions.
Asymmetric Activation oftropos 2,2′-Biphenol with Cinchonine Generates an Effective Catalyst for the Asymmetric Strecker Reaction ofN-Tosyl-Protected Aldimines and Ketoimines
The Strecker reaction of N-tosylaldimines with trimethylsilylcyanide in the presence of catalytic amount of iodine at room temperature produces the corresponding protected α-aminonitriles in high yields. Strecker reaction - N-tosylaldimine - trimethylsilylcyanide - protected α-aminonitrile - iodine Part 187 in the series, Studies on Novel Synthetic Methodologies.