Intramolecular Rearrangement of α-Azidoperoxides: An Efficient Synthesis of tert-Butyl Esters
摘要:
An unprecedented intramolecular rearrangement of alpha-azidoperoxides, promoted by simple organic base to provide tert-butyl esters, has been presented. Further, a one-pot methodology consisting of in situ generation of the a-azidoperoxides from corresponding aldehydes followed by base-promoted rearrangement to obtain the desired ester has also been executed. Relevant mechanistic studies, to provide the proof for intramolecular alkoxy transfer, are investigated.
PCl<sub>3</sub>-mediated transesterification and aminolysis of <i>tert</i>-butyl esters via acid chloride formation
作者:Xiaofang Wu、Lei Zhou、Fangshao Li、Jing Xiao
DOI:10.1177/1747519820987530
日期:2021.5
A PCl3-mediated conversion of tert-butyl esters into esters and amides in one-pot under air is developed. This novel protocol is highlighted by the synthesis of skeletons of bioactive molecules and gram-scale reactions. Mechanistic studies revealed that this transformation involves the formation of an acid chloride in situ, which is followed by reactions with alcohols or amines to afford the desired
Mechanism-Based Inhibitors of the Human Sirtuin 5 Deacylase: Structure-Activity Relationship, Biostructural, and Kinetic Insight
作者:Nima Rajabi、Marina Auth、Kathrin R. Troelsen、Martin Pannek、Dhaval P. Bhatt、Martin Fontenas、Matthew D. Hirschey、Clemens Steegborn、Andreas S. Madsen、Christian A. Olsen
DOI:10.1002/anie.201709050
日期:2017.11.20
The sirtuin enzymes are important regulatory deacylases in a variety of biochemical contexts and may therefore be potential therapeutic targets through either activation or inhibition by small molecules. Here, we describe the discovery of the most potent inhibitor of sirtuin5 (SIRT5) reported to date. We provide rationalization of the mode of binding by solving co‐crystal structures of selected inhibitors
The hydrogenation of esters catalyzed by a manganese complex of phosphine-aminopyridine ligand was developed. Using this protocol, a variety of (hetero)aromatic and aliphatic carboxylates including biomass-derived esters and lactones were hydrogenated to primary alcohols with 63–98% yields. The manganese catalyst was found to be active for the hydrogenation of methyl benzoate, providing benzyl alcohol
Esterification of Alcohols with 1-Acylimidazole Assisted by<i>N</i>-Bromosuccinimide
作者:Tsutomu Katsuki
DOI:10.1246/bcsj.49.2019
日期:1976.7
Treatment of 1-acylimidazoles with alcohols in the presence of N-bromosuccinimide led to the rapid formation of the corresponding esters. The carboxylic acids with less than two hydrogen atoms at their α-positions generally gave good results. Even such a hindered ester as t-butyl pivalate could be prepared by this procedure.
The reaction between carboxylic acids (RCOOH) and dialkyl dicarbonates [(R 1 OCO) 2 O], in the presence of a weak Lewis acid such as magnesium chloride and the corresponding alcohol (R 1 OH) as the solvent, leads to the esters RCOOR 1 in excellent yields. The mechanism involves a double addition of the acid to the dicarbonate, affording a carboxylic anhydride [(RCO) 2 O], R 1 OH and carbon dioxide