Eco-friendly synthesis of imines by ultrasound irradiation
摘要:
A series of imines was synthesized by an ultrasound-assisted reaction of aldehydes and primary amines using silica as the promoter. Products were obtained in high yields even in large scale synthesis. (c) 2007 Elsevier Ltd. All rights reserved.
An enantioselective Strecker synthesis employing novel chiral titaniumcomplex catalysts derived from structurally simple chiral N-salicyl-β-amino alcohols is described. Reactions of N-benzylidenebenzylamine with trimethylsilyl cyanide in the presence of the catalyst (10 mol%) gave the corresponding α-aminonitrile in good to excellent yields, along with relatively high enantioselectivity (up to 86%
evaluated as ligands for catalytic asymmetric Streckerreactions. N-Benzhydrylaldimines derived from aromatic and aliphatic aldehydes reacted with TMSCN in the presence of 10 mol% of Ti-1 complex to give the Strecker products in excellent yields and in up to >98% ee. The presence of a protic additive is essential to ensure good conversion and reaction rate. The reaction conditions are simple and the stereochemical