TEMPO-Mediated Aliphatic C–H Oxidation with Oximes and Hydrazones
摘要:
A method for aliphatic C-H bond oxidation of oximes and hydrazones mediated by 2,2,6,6-tetramethylpiperidin-1-oxyl (TEMPO) has been developed, which enables the concise assembly of substituted isoxazole and pyrazole skeletons.
Synthesis of β,β-diaryl propiophenones via palladium-catalyzed domino arylboronation, elimination and enone hydroarylation of enaminones
作者:Shanshan Zhong、Yu Lu、Yan Zhang、Yunyun Liu、Jie-Ping Wan
DOI:10.1039/c6ob01038e
日期:——
The syntheses of β,β-diaryl aryl propiophenones have been realized via palladium-catalyzed domino reactions of dimethyl amino functionalized enaminones and aryl boronic acids. This is the first example of transition metal-catalyzed enaminone C–N bond conversion for the generation of a new C–C(aryl) structure.
alcohols and β-ketoacids were realized under arylboronic acidcatalysis, furnishing a series of β-aryl ketones and β-ketoesters in yields of 15–99%, with CO2 and H2O being the byproducts. In this context, the decarboxylative alkylation reaction occurred to give β-aryl ketones at 50 °C, while the decarboxylation was suppressed to generate dialkylated ester products at 0 °C. A possible catalytic cycle was proposed