Efficient synthesis in water of mixed carbonates of cyanohydrins from aromatic aldehydes
作者:Torres Domínguez Héctor Manuel、Maldonado Luis Ángel、Le Lagadec Ronan
DOI:10.1016/j.tetlet.2019.151414
日期:2020.1
An efficient preparation of cyanohydrin ethyl carbonates via cyanocarbonation of aromatic and hetero-aromatic aldehydes with sodium cyanide and ethyl chlorocarbonate using commercial surfactants (5 mol %) in aqueous media at low temperature afforded almost quantitative isolated yields (≥ 94 %) in 30 minutes. Aromaticaldehydes bearing electron-donating as well as electron-withdrawing groups have been
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.
The cyanation of carbonyl compounds with ethyl cyanoformate is catalyzed by 4-dimethylaminopyridine (DMAP) to afford the corresponding cyanohydrin carbonates in excellent yields. The system provides a convenient method for cyanation of carbonyl compounds without using metal catalysts or solvents. (C) 2010 Elsevier Ltd. All rights reserved.
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.