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
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.