Lewis Base Catalyzed Aerobic Oxidative Intermolecular Azide-Zwitterion Cycloaddition
作者:Wenjun Li、Jian Wang
DOI:10.1002/anie.201408265
日期:2014.12.15
discovery of a novel aerobic oxidative intermolecular azide–zwitterion reaction catalyzed by an organocatalyst is presented. It is demonstrated that the merger of the Lewis base 1,8‐diazabicyclo[5.4.0]undec‐7‐ene and electron‐deficient olefins generates reactive zwitterion intermediates, which readily participate in cycloaddition reactions with an array of azides, thus providing facile entry to fully or
Strain-Activated Diels–Alder Trapping of 1,2-Cyclohexadienes: Intramolecular Capture by Pendent Furans
作者:Verner A. Lofstrand、Kyle C. McIntosh、Yaseen A. Almehmadi、F. G. West
DOI:10.1021/acs.orglett.9b02085
日期:2019.8.16
Intramolecular [4 + 2] cycloaddition reactions of substituted 1,2-cyclohexadienes with pendent furans enables the synthesis of complex tetracyclic scaffolds in a single step under mild conditions. All Diels–Alder cycloadducts were obtained as single diastereomers, assigned as the endo isomer. Substrates were easily assembled via Stork–Danheiser alkylation of 3-ethoxy-2-bromocyclohex-2-enone to accommodate
Irreversible Protein Labeling by Paal-Knorr Conjugation
作者:Ramesh Dasari、James J. La Clair、Alexander Kornienko
DOI:10.1002/cbic.201700210
日期:2017.9.19
lysines: Recent advances toward a suite of bioorthogonal chemical reactions have profoundly enhanced the tools available to biochemists to study proteins and other biomolecules. Here, we describe the use of the Paal–Knorr reaction to fluorescently label proteins. The described procedures operate without reagents, catalysts, or organic solvents, as needed for a biocompatible method.
The present invention relates to a process for the preparation of aromatic or furyl substituted olefins, which comprises reacting an olefinic compound with an aromatic compound or furan compound in the presence of carbon monoxide by using a rhodium carbonyl complex as a catalyst to form a corresponding aromatic or furyl substituted olefin.