Practical Chemoselective Acylation: Organocatalytic Chemodivergent Esterification and Amidation of Amino Alcohols with
<i>N</i>
‐Carbonylimidazoles
作者:Hope Nelson、William Richard、Hailee Brown、Abigail Medlin、Christina Light、Stephen T. Heller
DOI:10.1002/anie.202107438
日期:2021.10.11
DBU-catalyzed esterification: A single esterification product was obtained from a molecule containing primary aniline, alcohol, phenol, secondary amide, and N−H indole groups. These acylation reactions are highly practical as they involve only readily available, inexpensive, and relatively safe reagents; can be performed on a multigram scale; and can be used on carboxylic acids directly by in situ formation
A novel silver nanoparticle embedded mesoporous polyaniline (mPANI/Ag) nanocomposite as a recyclable catalyst in the acylation of amines and alcohols under solvent free conditions
作者:Usha Mandi、Anupam Singha Roy、Biplab Banerjee、Sk. Manirul Islam
DOI:10.1039/c4ra06182a
日期:——
Highly dispersed silver nanoparticles (Ag NPs) have been embedded into a mesoporous organic polymer (mPANI) and the material showed high catalytic activity in the acylation of amines and alcohols using acetic acid.
Metal-Catalyzed Acyl Transfer Reactions of Enol Esters: Role of Y<sub>5</sub>(O<i><sup>i</sup></i>Pr)<sub>13</sub>O and (thd)<sub>2</sub>Y(O<i><sup>i</sup></i>Pr) as Transesterification Catalysts
作者:Mei-Huey Lin、T. V. RajanBabu
DOI:10.1021/ol0057131
日期:2000.4.1
catalytic amounts (0.05-1 mol %) of Y5(OiPr)13O to give the corresponding esters. In selected cases, the yttrium catalyst promotes the selective O-acylation of amino alcohols without the formation of the amide. Enol esters also react with alpha-amino acid esters in the absence of a catalyst, at room temperature, to give the corresponding amides.
Lipase-mediated selective acetylation of primary alcohols in ethyl acetate
作者:Ernane C. de Souza、Moises Romero-Ortega、Horacio F. Olivo
DOI:10.1016/j.tetlet.2017.12.041
日期:2018.1
environmental friendly process to selectively acetylate primary alcohols was demonstrated. The esterification process consists of treatment of a primary alcohol in the presence of immobilized C. antarctica lipase (Novozyme-435) in ethyl acetate at room temperature. Primary alcohols were acetylated in the presence of secondary alcohols and phenols.
Practical, environment-benign and atom economic KOAc-catalysed deprotection of aryl TIPS ethers under mild fluoride-free conditions
作者:Bing Wang、Hui-Xia Sun、Bo Chen、Zhi-Hua Sun
DOI:10.1039/b905443j
日期:——
A KOAc-catalysed, fluoride-free protocol not only effects chemoselective deprotection of phenolic TIPS ethers without affecting acetal, ketal, carbamate, O-acetyl and aliphatic silyl ethers, but also improves its atom economy by recycling the silanol byproduct.