N-heterocyclic carbene catalyzed cyanation reaction of carbonyl compounds with ethyl cyanoformate and acetyl cyanide
作者:Jie Zhang、GuangFen Du、YueKe Xu、Lin He、Bin Dai
DOI:10.1016/j.tetlet.2011.10.119
日期:2011.12
employed as an efficientcatalyst for cyanation reaction of carbonyl compounds. Under catalysis of 1 mol % NHCs, various aldehydes and 2,2,2-trifluoroacetophenone coupled with ethyl cyanoformate in THF to provide cyanohydrins ethyl carbonates in excellent yields. While in the presence of 10 mol % catalyst, different types of aldehydes and 2,2,2-trifluoroacetophenone reacted with acetyl cyanide in dichloroethane
An efficient enantioselective cyanoformylation of aldehydes with ethyl cyanoformate, catalyzed by a chiral quaternary ammonium salt and triethylamine, has been developed. The reaction can be carried out in excellent yields (up to 97%) with moderate enantioselectivity (up to 72% ee).
Efficient and facile synthesis of cyanohydrin carbonate promoted by γ-alumina
作者:Katsuyuki Iwanami、Yusuke Osuka
DOI:10.1080/00397911.2022.2062248
日期:2022.4.3
Abstract A variety of cyanohydrin carbonates were readily prepared by the reaction of aldehydes with cyanoformate under the influence of γ-alumina using a convenient one-pot procedure.
N,N-Dimethylpyridin-4-Amine Mediated Protocol for Cyanoethoxycarbonylation of Aldehydes Under Solvent-Free Conditions
作者:Noor-ul H. Khan、Santosh Agrawal、Rukhsana I. Kureshy、Prasanta K. Bera、Sayed H. R. Abdi、Hari C. Bajaj
DOI:10.1007/s10562-010-0355-7
日期:2010.7
N, N-Dimethylpyridin-4-amine (DAMP) (10 mol%) was successfully employed as catalyst for cyanoethoxycarbonylation of aromatic and aliphatic aldehydes at room temperature under solvent free condition to give corresponding ethylcyanocarbonates in excellent isolated yield (up to 95%) in 15-90 min. Simple experimental conditions and product isolation procedure has made this protocol quite attractive for the synthesis of ethylcyanocarbonates in an environment-friendly manner.
Ionic liquid as catalytic and reusable media for cyanoethoxycarbonylation of aldehydes
作者:Noor-ul H. Khan、Santosh Agrawal、Rukhsana I. Kureshy、Sayed H.R. Abdi、Arghya Sadhukhan、Renjith S. Pillai、Hari C. Bajaj
DOI:10.1016/j.catcom.2010.04.005
日期:2010.5
Various ionic liquids (IL 1-9) based on N-methyl N'-alkyl imidazolium salts were explored as catalytic media in cyanoethoxycarbonylation of various aldehydes. The study revealed that the alkyl chain length and counter ion of the ionic liquid are critical for the product yield. The highest product yield of cyanohydrin carbonate (up to 96%) was obtained with C-5 alkyl chain with Br- as counter ion (IL 3). On the other hand PE6- as counter ion failed to catalyze the cyanoethoxycarbonylation reaction. (C) 2010 Elsevier B.V. All rights reserved.