The Influence of Growth Hormone Deficiency, Growth Hormone Replacement Therapy, and Other Aspects of Hypopituitarism on Fracture Rate and Bone Mineral Density
Silica sulfuric acid as a highly efficient catalyst for the synthesis of diarylacetic acids
作者:Desiree L. Moore、Allison E. Denton、Rose M. Kohinke、Brandon R. Craig、William E. Brenzovich
DOI:10.1080/00397911.2016.1158269
日期:2016.4.2
ABSTRACT An efficient heterogeneous method for the synthesis of diarylacetic acids was developed utilizing silica sulfuric acid as a catalyst. The reaction is highly efficient with a small amount of catalyst for the combination of a variety of electron-neutral to electron-rich arenes with glyoxylic acid. The reaction can also be utilized to synthesize unsymmetric derivatives from activated mandelic
Aromatic substituent effects in palladium-catalyzed intramolecular olefin oxyarylation reactions
作者:Mark C. Maust、Zacary L. Croft、Mackenzie W. Sullivan、Ross L. Dove、Emily E. Hardy、W.E. Brenzovich
DOI:10.1016/j.tetlet.2020.151674
日期:2020.3
The effect of electron-donating groups on the palladium-catalyzedintramolecular oxyarylation reaction was studied. In the case of activation at the ortho-position, the reaction favors the formation of a tricyclic lactone via C-H insertion. However, when the ipso-position is activated, the major product is instead a novel α,β-unsaturated lactone formed by way of a stabilized phenonium intermediate