Brønsted Acid and H‐Bond Activation in Boronic Acid Catalysis
作者:Shaofei Zhang、David Lebœuf、Joseph Moran
DOI:10.1002/chem.202001902
日期:2020.8.6
with boronic and Brønsted acids were interpreted along with correlations between their reactivity and their acidity measured by the Gutmann–Beckett method. Overall, it was concluded that the major modes of catalysis involve either dual H‐bond catalysis or Brønsted acidcatalysis. Strong Brønsted acids were shown to be generated in situ from covalent assembly of the boronic acids with hexafluoroisopropanol
Synthesis of Substituted Benzoxacycles via a Pd(II)-Catalyzed Intramolecular Arylation Reaction of Allylic Alcohols
作者:Jingjie Li、Ceheng Tan、Xinpeng Mu、Jianxian Gong、Zhen Yang
DOI:10.1002/cjoc.201600527
日期:2017.5
Herein a Pd‐catalyzed intramolecular allylation reaction of unprotected allylic alcohols was developed, and the reaction proceeded through a Pd(II)‐mediated allylic carbocation species formation, followed by a Friedel‐Crafts type annulation to afford functionalized chromanes.
Boronic Acid Catalysis as a Mild and Versatile Strategy for Direct Carbo- and Heterocyclizations of Free Allylic Alcohols
作者:Hongchao Zheng、Sina Ghanbari、Shinji Nakamura、Dennis G. Hall
DOI:10.1002/anie.201201620
日期:2012.6.18
BAC to the future: Boronic acid catalysis (BAC) was applied to the direct activation of alcohols leading to the preparation of carbocycles (see scheme), benzofurans, tetrahydrofurans, pyrrolidines, pyrans, piperidines, and various polycyclic compounds. The reactions proceed under mild conditions that circumvent the use of reactive leaving groups like halides.