Olefin-Directed Palladium-Catalyzed Regio- and Stereoselective Hydroboration of Allenes
作者:Can Zhu、Bin Yang、Youai Qiu、Jan-E. Bäckvall
DOI:10.1002/chem.201505130
日期:2016.2.24
An olefin‐directed palladium‐catalyzed regio‐ and stereoselective hydroboration of allenes has been developed to afford fully substituted alkenylboron compounds. The reaction showed a broad substrate scope: a number of functionalized allenes, including 2,3‐dienoate, 3,4‐dienoate, 3,4‐dienol, 1,2‐allenylphosphonate, and alkyl‐substituted allenes, could be used in this olefin‐directed allene hydroboration
Gold(I)-catalysed synthesis of cyclic sulfamidates: current scope, stereochemistry and competing ene-allene cycloisomerisation
作者:Mari C.M. Higginbotham、Lorna Kennedy、Anita G. Lindsay、Andreas Troester、Magnus W.P. Bebbington
DOI:10.1016/j.tet.2014.11.058
日期:2015.1
Six-membered cyclic sulfamidates are prepared in high yields by treatment of allenic sulfamates with readily available Ph3PAuNTf2. The reaction enables formation of N-substituted quaternary centres in high yields. The relative stereochemistry has been unambiguously determined. A π-rearrangement is faster than hydroamination in the case of an allyl-substituted sulfamate and a mechanism is proposed for
Highly Selective FeCl<sub>3</sub>-Catalyzed Cyclization of β-Sulfonamidoallenes or β-Allenols and Aldehydes
作者:Jiajia Cheng、Xinjun Tang、Shengming Ma
DOI:10.1021/cs300838k
日期:2013.4.5
A FeCl3-catalyzed Prinscyclization reaction of β-sulfonamidoallenes or β-allenols with aldehydes has been developed for the synthesis of 3-chloromethyl-1,2,5,6-tetrahydro-1H-pyridine or 3-chloromethyl-5,6-dihydro-2H-pyran. The reaction is highly selective due to the stability of the allyl cation intermediate.
Regio‐ and Stereoselective Carbon‐Boron Bond Formation via Heterogeneous Palladium‐Catalyzed Hydroboration of Enallenes
作者:Veluru Ramesh Naidu、Abdolrahim A. Rafi、Cheuk‐Wai Tai、Jan‐E. Bäckvall、Armando Córdova
DOI:10.1002/chem.202203950
日期:——
cellulose catalyzes hydroborations: A highly efficient and stereoselective heterogeneous palladium-catalyzed hydroboration reaction of enallenes was developed. Nanopalladium immobilized on microcrystalline cellulose (MCC) was successfully employed as an efficientcatalyst for the enallene hydroboration reaction. The cellulose-supported palladiumcatalyst exhibits high stability and recyclability, providing