An efficient method for the synthesis of acylals from aldehydes using silica-supported perchloric acid (HClO4–SiO2)
作者:Vinod T. Kamble、Vasant S. Jamode、Neeta S. Joshi、Ankush V. Biradar、Rameshchandra Y. Deshmukh
DOI:10.1016/j.tetlet.2006.05.125
日期:2006.7
The synthesis of acylals from structurally diverse aldehydes has been performed in excellent yields under solvent-free conditions using HClO4–SiO2 as a mild, convenient, reusable, and heterogeneous catalyst. The procedure is operationally simple, environmentally benign and has the advantage of enhanced atom utilization. Furthermore, the catalyst can be recovered simply and reused efficiently a number
Iron(III) tosylate catalyzed acylation of alcohols, phenols, and aldehydes
作者:Neil J. Baldwin、Anna N. Nord、Brendan D. O’Donnell、Ram S. Mohan
DOI:10.1016/j.tetlet.2012.10.033
日期:2012.12
Iron(III) p-toluenesulfonate (tosylate) is an efficient catalyst for acetylation of alcohols, phenols, and aldehydes. The acetylation of 1° and 2° alcohols, diols, and phenols proceeded smoothly with 2.0 mol % of catalyst. However, the reaction worked well with only a few 3° alcohols. The methodology was also applicable to the synthesis of a few benzoate esters but required the use of 5.0 mol % catalyst
A succinimide-N-sulfonic acid catalyst for acetylation reactions in absence of a solvent
作者:Farhad SHIRINI、Nader Ghaffari KHALIGH
DOI:10.1016/s1872-2067(11)60499-3
日期:2013.4
Abstract A small amount of succinimide-N-sulfonic acid efficiently catalyzed the acetylation of a variety alcohols, phenols, thiols, amines and aldehydes with acetic anhydride at room temperature under solvent free conditions. This catalyst has the advantages of excellent yields and short reaction times and the reaction can be carried out on a large scale, which makes it potentially useful for industrial
A Mild and Efficient Method for the Chemoselective Synthesis of Acylals from Aldehydes and their Deprotections Catalysed by Ceric Ammonium Nitrate
作者:Subhas Chandra Roy、Biplab Banerjee
DOI:10.1055/s-2002-34243
日期:——
A mild and efficientmethod has been developed for the chemoselective synthesis of geminal diacetates (acylals) from aldehydes using acetic anhydride in the presence of a catalytic amount of ceric ammonium nitrate in excellent yield. Ketones are found to be unaffected under the reaction conditions. The deprotections of acylals by using water and ceric ammonium nitrate have also been achieved.
An efficient and simple procedure has been developed for the acetylation of aldehyde by selectfluor™ [1-(chloromethyl)-4-fluoro-1,4-diazoniabicyclo[2,2,2]octane bis(tetrafluoroborate)] as a chemoselective and environmentally friendly catalystundersolvent-freeconditions or microwave irradiation. The application of microwave irradiation improved the yields and reduced the reaction times. In this study