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.
Hydrocyanation of Sulfonylimines Using Potassium Hexacyanoferrate(II) as an Eco-Friendly Cyanide Source
作者:Zheng Li、Huanhuan Zheng、Rongzhi Li、Fei Wen、Hongbo Li、Junjun Yin、Jingya Yang
DOI:10.5935/0103-5053.20130218
日期:——
An efficient and eco-friendly method for hydrocyanation of sulfonylimines via one-pot two-step procedure usingpotassiumhexacyanoferrate(II) as a cyanidesource, benzoyl chloride as a promoter, and potassium carbonate as a base is described. This protocol has the features of using nontoxic, nonvolatile and inexpensive cyanidesource, high yield, and simple work-up procedure.
Lewis base-catalyzed Strecker-type reaction between trimethylsilyl cyanide and N-tosylimines proceeded smoothly in dry DMF or water-containing DMF and the corresponding α-amino compounds were obtained in good to high yields.
Dimethylsulfoxide-Promoted Strecker Reaction of N-Tosylaldimines with Cyanoformate
作者:Sung Kim、Santosh Kadam、Ponnaboina Thirupathi
DOI:10.1055/s-0030-1258447
日期:2011.3
A metal-free method for performing the Strecker reaction of N-tosylaldimines with ethyl cyanoformate in dimethylsulfoxide (DMSO) has been developed. Various types of N-tosyl-aldimines undergo the cyanation to provide the N-protected α-amino nitriles. This uncatalyzed protocol requires neither elevated temperature nor high pressure for the cyanations.