Recyclable copper catalyzed nitrogenation of biphenyl halides: a direct approach to carbazoles
作者:Yang Ou、Ning Jiao
DOI:10.1039/c3cc41443d
日期:——
A novel A21-CuI catalyzed direct nitrogenation of biphenyl halides for the direct synthesis of carbazoles via a direct C–H amination process has been developed. A recyclable and inexpensive Cu-catalyst was successfully employed in N-heterocyclic compound synthesis via tandem azidation and C–H amination, which makes this protocol very practical and easy to handle.
Chemoselective Transformations of Cyclic β-Bromoacrylic Acids with Palladacycles Formed by Aryl Iodides to Access Fused or Spiro Polycycles
作者:Fengru Zhou、Liwei Zhou、Pengyang Jing、Mingjie Sun、Guobo Deng、Yun Liang、Yuan Yang
DOI:10.1021/acs.orglett.2c00254
日期:2022.2.18
A palladium-catalyzed chemoselective decarboxylative annulation of different aryliodides with cyclic β-bromoacrylic acids for the construction of interesting fused and spiro polycycles is disclosed. Notably, cyclic β-bromoacrylic acids can chemoselectively act as C1 or C2 insertion units by the use of different aryliodides. 2-Iodo-N-methacryloylbenzamides can undergo a Heck/[4+2] annulation to afford
Rapid assembly of fluorene-based spirocycles represents a highly significant but challenging task in organic synthesis. Reported herein is a novel Pd(0)-catalyzed [4+1] spiroannulation of simple o-iodobiaryls with bromonaphthols for the one-step construction of [4,5]-spirofluorenes in high yields with excellent functional group tolerance. Noteworthily, these valuable fluorene-based coumarin skeletons
Synthesis of phenanthridine derivatives via cascade annulation of diaryliodonium salts and nitriles
作者:Jian Li、Hongni Wang、Jiangtao Sun、Yang Yang、Li Liu
DOI:10.1039/c4ob01504e
日期:——
A cascade coupling reaction toward a variety of phenanthridine derivatives has been developed. This cascade transformation proceeds via the copper-catalyzed coupling reaction of diaryliodonium salts and nitriles, and undergoes cyclization into the phenanthridine core.