A NOVEL AND EFFICIENT CONVERSION OF ALDEHYDES TO 1,1-DIACETATES CATALYZED WITH FeCl<sub>3</sub>/SiO<sub>2</sub>UNDER MICROWAVE IRRADIATION
作者:Cunde Wang、Minghua Li
DOI:10.1081/scc-120014779
日期:2002.1
ABSTRACT 1,1-Diacetates (3) are effectively synthesized in few minutes by acylation reaction of aldehydes with acetic anhydride in the presence of FeCl3/SiO2 under microwave irradiation.
An Improved Method for the Synthesis of Allylic<i>gem</i>-Diacetates from α,β-Unsaturated Aldehydes Catalyzed by Lithium Tetrafluoroborate
作者:Fumiaki Ono、Kuniaki Nishioka、Shirou Itami、Hirotaka Takenaka、Tsuneo Sato
DOI:10.1246/cl.2008.1248
日期:2008.12.5
An improved method for the synthesis of allylic gem-diacetates (acylals) is described. The desired acylals are obtained by the reaction of α,β-unsaturated aldehydes with acetic anhydride using a catalytic amount of lithium tetrafluoroborate in diethyl ether at room temperature.
RuCl<sub>3</sub> · <i>x</i>H<sub>2</sub>O: A New Efficient Catalyst for Facile Preparation of 1,1‐Diacetates from Aldehydes
作者:Anil Saini、Sanjay Kumar、Jagir. S. Sandhu
DOI:10.1080/00397910701650831
日期:2007.12.1
Abstract An efficient, facilepreparation of aldehyde 1,1‐diacetates (acylals) in excellent yields catalyzed by RuCl3 · xH2O is described. Ketones do not react under these conditions.
Zinc Tetrafluoroborate-Catalyzed Efficient Conversion of Aldehydes to Geminal Diacetates and Cyanoacetates
作者:Brindaban C. Ranu、Jyotirmoy Dutta、Arijit Das
DOI:10.1246/cl.2003.366
日期:2003.4
A trace of an aqueous solution of zinc tetrafluoroborate was demonstrated to catalyze the conversion of an aldehyde to its 1,1-diacetate by acetic anhydride without any solvent. A similar reaction of an aldehyde with a mixture of potassium cyanide and acetic anhydride in methylene chloride was also catalyzed by Zn(BF4)2 to provide the corresponding geminal cyanoacetate.
HBF 4 -SiO 2 has been found to be an outstanding catalyst for the protection of carbonyl compounds as acylals under entirely solvent-free conditions. Some of the major advantages of this procedure are high yields, ease of operation, high chemoselectivity, high atom efficiency, and compatibility with other protecting groups.