Selective Acylation of Aryl- and Heteroarylmagnesium Reagents with Esters in Continuous Flow
作者:Benjamin Heinz、Dimitrije Djukanovic、Maximilian A. Ganiek、Benjamin Martin、Berthold Schenkel、Paul Knochel
DOI:10.1021/acs.orglett.9b04254
日期:2020.1.17
A selectiveacylation of readily accessible organomagnesium reagents with commercially available esters proceeds at convenient temperatures and short residence times in continuous flow. Flow conditions allow us to prevent premature collapse of the hemiacetal intermediates despite noncryogenic conditions, thus furnishing ketones in good yields. Throughout, the coordinating ability of the ester and/or
Esterification of Aldehydes and Alcohols with Pyridinium Hydrobromide Perbromide in Water
作者:Shinsei Sayama、Tetsuo Onami
DOI:10.1055/s-2004-835630
日期:——
The direct esterification of aldehydes and alcohols was carried out with pyridinium hydrobromide perbromide in water at room temperature. A variety of aldehydes were converted to respective ester derivatives with alcoholssuch as methanol, 1,2-ethanediol, 1,3-propanediol. Further, a variety of aliphatic alcohols were also converted to the corresponding Tishchenko-like dimeric esters in good yields under
Electrochemical esterification reaction of alkynes with diols <i>via</i> cleavage of carbon–carbon triple bonds without catalyst and oxidant
作者:Pei-Long Wang、Hui-Zhi Shen、Hui-Hui Cheng、Hui Gao、Pin-Hua Li
DOI:10.1039/d0gc02193h
日期:——
as it is catalyst-free, oxidant-free, and additive-free and shows atom-economy. This is the first example of an electrochemical reaction via cleavage of carbon–carbon triple bonds. Meanwhile, this is also the first example of a carbon–carbon triple bond cleavage reaction of alkynes with diols.
Highly Selective Methodology for the Direct Conversion of Aromatic Aldehydes to Glycol Monoesters
作者:Hashem Sharghi、Mona Hosseini Sarvari
DOI:10.1021/jo020724o
日期:2003.5.1
Al(2)O(3)/MeSO(3)H (AMA) was found to be an extremely efficient reagent for the conversion of aromatic aldehydes and diols to glycol monoesters. The remarkable selectivity achieved with this reagent is an attractive feature of the present method.
Abstract Started from salicylicacid (SA) and related commercialized plant activators, based on molecular three-dimensional shape and pharmacophore similarity comparison (SHAFTS), a new lead compound benzotriazole was predicted and a series of benzotriazole derivatives were designed and synthesized. The bioassay showed that benzotriazole had high activity against a broad spectrum of diseases including