Lithium Diisopropylamide Catalyzed Allylic C–H Bond Alkylation with Styrenes
作者:Xiang-Yu Zhang、Lei Zheng、Bing-Tao Guan
DOI:10.1021/acs.orglett.8b03108
日期:2018.11.16
Allylic substitution reactions, a well-established approach for new bond construction, often need transition-metal catalysts and stoichiometric amounts of organometallic reagents, strong bases, or oxidants. Lithium diisopropylamide (LDA), a widely used and commercially available Brønsted base, is herein reported to catalyze the allylic C–H bond addition of 1,3-diarylpropenes to styrenes. Preliminary mechanism
Allyl–aryl coupling of allylic carbonates with arylboronic acids catalyzed by palladium nanoparticles in ionic liquid
作者:Jing Xu、Xing Zhai、Xue Wu、Yong Jian Zhang
DOI:10.1016/j.tet.2015.01.046
日期:2015.3
A practical and greener process for the allyl–aryl coupling of allylic carbonates with arylboronicacids catalyzed by in situ generated palladium nanoparticles (PdNPs) in ionic liquid (IL) has been described. The PdNPs showed high catalytic activity for the coupling reaction in the IL to afford allyl–aryl coupling products in good to high yields with complete regio- and E/Z selectivities. The PdNPs
Chemoselective Three‐Component Geminal Cross Couplings of Dihaloalkanes with Cr Catalysis: Rapid Access to Tertiary and Quaternary Alkanes via a Metal–Carbene Intermediate
The three-component geminal couplings have been achieved by design of a chromium catalytic system using dihaloalkanes to selective react with organomagnesium and chlorosilanes/alkyl tosylates. These newly developed reactions are effective for rapidly forming tertiary and quaternary alkanes via a Cr carbene intermediate with a novel inner-sphere radical coupling mechanism, showing great potential in