DABCO-Mediated Synthesis and Biological Activity of Cyanohydrin Esters
作者:H. M. R. Hoffmann、Z. M. Ismail、Reiner Hollweg、Abdul R. Zein
DOI:10.1246/bcsj.63.1807
日期:1990.6
Cyanohydrinesters 1–31 have been prepared from α-ketonitriles and aldehydes using DABCO (1,4-diazabicyclo[2.2.2] octane) as nucleophilic acylation catalyst. The modified piperonal 8 was found to inhibit the formation of thromboxane synthetase.
Ionic Liquid [bmim]BF<sub>4</sub> as an Efficient and Recyclable Reaction Medium for the Synthesis of <i>O</i>-Acetyl Cyanohydrin via One-Pot Condensation of Aldehyde, TMSCN, and Ac<sub>2</sub>O
作者:Zhi-Liang Shen、Shun-Jun Ji
DOI:10.1080/00397910802431172
日期:2009.2.9
Abstract Ionicliquid [bmim]BF4 has been demonstrated to be an efficient and environmentally friendly reaction medium as well as reaction promoter for the synthesis of O-acetyl cyanohydrin viaone-pot condensation of aldehyde, TMSCN, and Ac2O without Lewis acid or any special activation. In addition, the recovered ionicliquid could be reused for subsequent runs without the loss of activity.
spectroscopy studies, of the Lewis acid–Lewis base catalyzed addition of acetyl cyanide to prochiral aldehydes provides support for a reaction route that involves Lewis base activation of the acyl cyanide with formation of a potent acylating agent and cyanide ion. The cyanide ion adds to the carbonyl group of the Lewisacid activated aldehyde. O‐Acylation by the acylated Lewis base to form the final cyanohydrin