Enantioselective Pd(II)-Catalyzed Intramolecular Oxidative 6-<i>endo</i> Aminoacetoxylation of Unactivated Alkenes
作者:Xiaoxu Qi、Chaohuang Chen、Chuanqi Hou、Liang Fu、Pinhong Chen、Guosheng Liu
DOI:10.1021/jacs.8b03767
日期:2018.6.20
A novel asymmetric 6-endo aminoacetoxylation of unactivatedalkenes by palladium catalysis, which yields chiral β-acetoxylated piperidines with excellent chemo-, regio- and enantioselectivities under very mild reaction conditions, has been established herein by employing a new designed pyridine-oxazoline (Pyox) ligand. Importantly, introducing a sterically bulky group into the C-6 position of Pyox
Enantioselective Syntheses of 2-Azabicyclo[2.2.1]heptanes via Brønsted Acid Catalyzed Ring-Opening of <i>meso</i>-Epoxides
作者:Min Cai、Jiao Ma、Qimin Wu、Aijun Lin、Hequan Yao
DOI:10.1021/acs.orglett.2c03529
日期:2022.12.9
A chiral phosphoric acid-catalyzed ring-opening of meso-epoxides was developed. A range of 2-azabicyclo[2.2.1]heptanes were obtained in high yields with excellent enantioselectivities. In addition, the hydroxyl and amide groups in the products provided handles for further derivatization.
Construction of oxygenated 2-azabicyclo[2.2.1]heptanes <i>via</i> palladium-catalyzed 1,2-aminoacyloxylation of cyclopentenes
作者:Haipin Zhou、Rui Pan、Menghua Xu、Jiao Ma、Aijun Lin、Hequan Yao
DOI:10.1039/d2cc06581a
日期:——
Herein, we describe a palladium-catalyzed 1,2-aminoacyloxylation of cyclopentenes to synthesize oxygenated 2-azabicyclo[2.2.1]heptanes. This reaction proceeds efficiently with a broad array of substrates. The products could be further functionalized to build up a library of bridged aza-bicyclic structures.
Construction of 2‐Azabicyclo[2.2.1]heptenes via Selenium‐Catalyzed Intramolecular Oxidative Amination of Cyclopentenes
作者:Jiao Ma、Liuli Dong、Jiarong Yao、Aijun Lin、Hequan Yao
DOI:10.1002/adsc.202300200
日期:2023.6.20
A selenium-catalyzed intramolecular oxidative amination of cyclopentenes has been described. A variety of 2-azabicyclo[2.2.1]heptenes were obtained with 58%–96% yields. This protocol was featured with mild reaction conditions and broad substrate scope. The subsequent modification of the bicyclic backbone and amino group further demonstrated the application value of this aza-bridged ring.