A Facile and Efficient Conversion of Aldehydes into 1,1-Diacetates (Acylals) using Iron(III) Fluoride as a Novel Catalyst
作者:V. T. Kamble、R. A. Tayade、B. S. Davane、K. R. Kadam
DOI:10.1071/ch06166
日期:——
Aldehydes are smoothly converted into the corresponding 1,1-diacetates (acylals) in high yields in the presence of a catalytic amount (0.1 mol-%) of iron(III) fluoride at room temperature. The noteworthy features of the present system are shorter reaction times, chemoselective protection of aldehydes, and solvent-free conditions. The procedure is especially useful for large-scale syntheses as the catalyst
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.
A Versatile and Practical Synthesis of 1,1-Diacetates from Aldehydes Catalyzed by Cyanuric Chloride
作者:Babasaheb P. Bandgar、Neeta S. Joshi、Vinod T. Kamble
DOI:10.1002/jccs.200700069
日期:2007.4
Structurally diverse aldehydes are successfully converted into 1,1-diacetates with acetic anhydride using cyanuric chloride as a mild, convenient and inexpensive catalyst under solvent-free conditions. The noteworthy features of the present system are shorter reaction times, and mild and solvent-free conditions. Furthermore, it offers chemoselective protection of aldehydes.
A Fast and Efficient Deprotection of Aldehydes from Acylals Using a Wells‐Dawson Heteropolyacid Catalyst (H<sub>6</sub>P<sub>2</sub>W<sub>18</sub>O<sub>62</sub> · 24H<sub>2</sub>O)
作者:G. P. Romanelli、J. C. Autino、G. Baronetti、H. J. Thomas
DOI:10.1081/scc-200034783
日期:2004.12.31
Abstract A rapid and efficientmethod for the deprotection of aldehyde 1,1‐diacetates is described. The reaction was carried out using a Wells‐Dawson type catalyst supported on silica. The catalyst, used in 1% molar quantity, is easily recoverable and reusable and maintains the activity after its use in four consecutive reaction batches. The yield of the deprotection was 92–100% (15 examples including
The chemistry of acylals. Part I. The reactivity of acylals towards Grignard and organolithium reagents
作者:Leiv K. Sydnes、Marcel Sandberg
DOI:10.1016/s0040-4020(97)00789-8
日期:1997.9
been prepared and reacted with Grignard and alkyllithium reagents. Acylals from formaldehyde furnished complex reaction mixtures when reacted with both reagents. Acylals of other aldehydes gave reaction mixtures that consisted mainly of an ester, generated by replacing one of the carboxy groups with the organic part of the organometallic reagent, and regenerated aldehyde. The esters were formed in the