Observation of an Acryloyl−Thiamin Diphosphate Adduct in the First Step of Clavulanic Acid Biosynthesis
作者:Matthew Merski、Craig A. Townsend
DOI:10.1021/ja076704r
日期:2007.12.1
intramolecular imine formation with the cofactor as its cause. Circulardichroism experiments and others discount chargetransfer as a likely explanation for the approximately 120 nm red shift of the chromophore ( approximately 25 kcal). Examples are well-known of charged molecules that exhibit significantly red-shifted UV-visible spectra compared to their neutral forms as, for example, polyene cations and
Aerobic oxidation of secondary benzylic alcohols and direct oxidative amidation of aryl aldehydes promoted by sodium hydride
作者:Xinbo Wang、David Zhigang Wang
DOI:10.1016/j.tet.2011.03.052
日期:2011.5
possible mechanistic implications of a simplest oxidant (NaH/air) uncovered on a broad range of useful transformations, including aerobic alcoholoxidations, allylicalcohol isomerizations and oxidations, cyclopropyl alcoholfragmentations, and direct aryl aldehyde oxidative amidations. These readily implementable transition-metal-free processes feature exceptional material accessibility, operational simplicity