Cationic Palladium-Catalyzed [5+2] Annulation: Synthesis of 1-Benzoxepines from 2-Aroylmethoxyarylboronic Acids
作者:Guixia Liu、Xiyan Lu
DOI:10.1002/adsc.200700369
日期:2007.10.8
The synthesis of 1-benzoxepinesfrom2-aroylmethoxyarylboronicacids and alkynes in the presence of a catalytic amount of [Pd(dppp)(H2O)2]2+(TfO−)2 was developed. This [5+2] annulation involves the intramolecular nucleophilic addition of a vinylpalladium species to ketones.
Cu(<scp>i</scp>)-Catalyzed asymmetric intramolecular addition of aryl pinacolboronic esters to unactivated ketones: enantioselective synthesis of 2,3-dihydrobenzofuran-3-ol derivatives
作者:Chunjie Ni、Jihui Gao、Xianjie Fang
DOI:10.1039/c9cc09653a
日期:——
An (S,S)-QuinoxP*-supported Cu(i) catalyst has been disclosed for highly enantioselective intramolecular addition of aryl pinacolboronic esters to unactivated ketones under mild reaction conditions. This protocol showcases a broad substrate tolerance and allows access to various chiral 2,3-dihydrobenzofuran-3-ol derivatives in generally good yields with excellent enantioselectivities.
Palladium(II)-catalyzed intramolecular addition of arylboronic acids to ketones
作者:Guixia Liu、Xiyan Lu
DOI:10.1016/j.tet.2008.05.056
日期:2008.7
A palladium(II)-catalyzed intramolecular addition of arylboronic acids to ketones was developed. Compared to Pd(OAc)2 catalysis system, cationic palladium complex with dppp as the ligand has higher catalytic activity and efficiency for wider scope of substrates. From this reaction, the normal addition product or the dehydrated product could be selectively furnished as controlled by additives. Highly