Synthesis, structure and comparative stability of β-hydrazono, oximino methyl ether and imino boronates
作者:Richard J. Mears、Helen E. Sailes、John P. Watts、Andrew Whiting
DOI:10.1039/b004573j
日期:——
prepared by the sequential lithiation of the corresponding methyl hydrazone or oxime methyl ether, followed by reaction with an iodomethylboronate ester, typically in the form of the pinacol ester. The resulting products have contrasting hydrolytic stabilities. β-Hydrazono boronates are highly sensitive to intramolecularly catalysed hydrolysis, providing the corresponding β-keto boronates in generally high
Insights into the Mechanism and Catalysis of Oxime Coupling Chemistry at Physiological pH
作者:Shujiang Wang、Deepanjali Gurav、Oommen P. Oommen、Oommen P. Varghese
DOI:10.1002/chem.201406458
日期:2015.4.7
activation in the oxime reaction with aldehyde and keto substrates. We also present carboxylates as activating agents that can promote the oxime reaction with both aldehyde and keto substrates at physiologicalpH. This rate enhancement circumvents the influence of α‐effect by forming H‐bonds with the rate‐limiting intermediate, which drives the reaction to completion. The combination of aniline and carboxylates