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
Thallium(III) Chloride: A Mild
and Efficient Catalyst for Acylation of Alcohols, Phenols
and Thiols, and for Geminal Diacylation of Aldehydes under
Solvent-Free Conditions
作者:Sung Kim、Santosh Kadam
DOI:10.1055/s-0028-1083148
日期:——
simple and efficientcatalyst for acylation of alcohols, phenols and thiols. It is also very effective for geminal diacylation of aldehydes. The acylation reaction using acetic anhydride proceeds in excellent yield in the presence of catalytic amounts ofthallium(III) chloride (1 mol%) at room temperature within relatively short reaction times (<20 min). Structurally diverse alcohols, phenols, thiols and
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
Scandium Triflate Catalyzed Allylation of Acetals and <i>gem</i>-Diacetates: A Facile Synthesis of Homoallyl Ethers and Acetates
作者:Jhillu S. Yadav、Basi V. Subba Reddy、P. Srihari
DOI:10.1055/s-2001-13379
日期:——
Scandium triflate catalyzes efficiently the allylation reactions of acetals and gem-diacetates with allyltrimethylsilane at ambient temperature to afford the corresponding homoallyl ethers and acetates in high yields. Also it is found to be effective for the direct formation of homoallyl ethers from aldehydes and allylsilane in presence of trimethylorthoformate.
LiBF4-Mediated Conversion of Aldehydes to gem-Diacetates
作者:Jhillu S. Yadav、Basi V. S. Reddy、Chenna Venugopal、T. Ramalingam
DOI:10.1055/s-2002-22705
日期:——
An efficient and highly selective method for the conversion of aldehydes to gem-diacetates is described using lithium tetrafluoroborate under mild reaction conditions. Due to the neutral reaction conditions, this method is compatible with acid-sensitive protecting groups such as acetonides, carbamates, THP and TBDMS ethers present in the substrate.