Cyanation of α,β-unsaturated enones by malononitrile in open air under metal-catalyst-free conditions
作者:Shaoxia Lin、Ying Wei、Fushun Liang
DOI:10.1039/c2cc35528k
日期:——
Cyanation of α,β-unsaturated enones by employing malononitrile as the organic cyanation source has been disclosed, which proceeds efficiently at room temperature in open air under metal-catalyst-free conditions.
Scalable Electrocatalytic Intermolecular Acylcyanation and Aminocyanation of Alkenes
作者:Xianqiang Kong、Xiaohui Chen、Yiyi Chen、Zhong-Yan Cao
DOI:10.1021/acs.joc.1c03134
日期:2022.6.3
Electrocatalytic three-component acylcyanation and aminocyanation of simple alkenes have been developed. The protocol features high functional group tolerance and can easily be scaled up. The key to success is to use an electrophilic cyanation source, enabling a broadened use of alkenes to aliphatic ones for acylcyanation.
Herein is reported an electrochemical procedure based on the Hydrogen Evolution Reaction of acetone cyanohydrin at a Pt cathode enabling the cyanation of α,β- unsaturated carbonyl and imines. Catalytic current, along with a correspondingly reduced quantity of supporting electrolyte, facilitates the scalability of the procedure, ensuring brief electrolysis times while maintaining a simple electrochemical
A first example of solvent- and additive-free 1,4-addition reaction of alpha,beta-unsaturated ketones such as chalcones, 3-nonen-2-one and benzalacetone with trimethylsilyl cyanide (TMSCN) is described. The addition of TMSCN to chalcones, 3-nonen-2-one, and benzalacetone under microwave irradiation in the absence of Lewis or Bronsted acids and solvents, yielded the corresponding beta-cyanoketones in good to moderate yields, as quite rapidly as in 5 min. No systematic substituent effect of chalcones on the yields was observed. No reaction of alpha,beta-unsaturated esters such as methyl cinnamate with TMSCN took place under the same conditions. (c) 2007 Published by Elsevier Ltd.
Thiourea-functionalized magnetic hydroxyapatite as a recyclable inorganic–organic hybrid nanocatalyst for conjugate hydrocyanation of chalcones with TMSCN
The recoverable nanomagnetic catalyst was manufactured based on thiourea modified magnetic hydroxyapatite. Magnetic hydroxyapatite (mHAp) as the inorganic-organic hybrid support was fabricated using co-precipitate condition and then modified via the covalently anchoring of 1-(3,5-bis(trifluoromethyl)phenyl-3-propyl)thiourea. The hybrid nano-catalyst has been identified by TEM, SEM, FTIR, BET, TGA, and XRD. This nanocatalyst appeared efficient and robust in the 1,4-addition reaction of TMSCN to alpha,beta-unsaturated aromatic enones in excellent yields (85-96%) under mild reaction condition and simple work-up process. This recoverable organocatalyst has a great potential as an industrially viable and eco-safe catalyst. (C) 2015 Elsevier B.V. All rights reserved.