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
Palladium(II)-Catalyzed C(sp3)–H Activation of N,O-Ketals towards a Method for the β-Functionalization of Ketones
作者:Danny Ho、Jonas Calleja、Matthew Gaunt
DOI:10.1055/s-0037-1611664
日期:2019.3
formal β-functionalization of aliphatic ketones via a palladium-catalyzed sp3 C–H activation pathway is reported. An N,O-ketal directs an aliphatic C–H carbonylation to form γ-lactams which upon hydrolysis generate γ-keto carboxylic acids. This C–C bond-forming reaction is tolerant of a range of functional groups, enabling the synthesis of a range of synthetically important building blocks. Furthermore,