1463-60-1Relevant academic research and scientific papers
Addition of a Carbene Catalyst to Indole Aryl Aldehyde Activates a Remote δ-sp2 Carbon for Protonation and Formal [4+2] Reaction
Zheng, Pengcheng,Wu, Shuquan,Mou, Chengli,Xue, Wei,Jin, Zhichao,Chi, Yonggui Robin
, p. 5026 - 5029 (2019)
The addition of a carbene catalyst to an indole aryl aldehyde leads to the activation of a remote sp2 carbon that is five atoms away from the catalyst. The unsaturated Breslow intermediate formed between the catalyst and substrate undergoes an internal redox reaction and remote carbon protonation to generate an analogous azolium vinyl enolate intermediate. Subsequent [4+2] reaction with cyclic imine substrates eventually affords multicyclic pyridoindoles as nearly single diastereomers with excellent enantioselectivities.
One-Pot Base-Mediated Synthesis of Functionalized Aza-Fused Polycyclic Quinoline Derivatives
Jiang, Zeng-Qiang,Miao, Da-Zhuang,Tong, Yao,Pan, Qiang,Li, Xiao-Tong,Hu, Ren-He,Han, Shi-Qing
, p. 1913 - 1921 (2015)
A new one-pot protocol has been developed for the facile and efficient synthesis of aza-fused polycyclic quinolines (e.g., pyrrolo[1,2-a]quinolines) by the base-catalyzed reaction of 2-formylpyrroles and 2-halophenylacetonitriles. This reaction proceeded under transition metal-free conditions and showed high functional group tolerance, with the desired products being formed in good yields.
Highly enantioselective synthesis of functionalized azepino[1,2-a] indoles via NHC-catalyzed [3+4] annulation
Zhu, Shi-Ya,Zhang, Yuanzhen,Chen, Xin-Fa,Huang, Jun,Shi, Shi-Hui,Hui, Xin-Ping
, p. 4363 - 4366 (2019)
The enantioselective [3+4] annulation of 3-formylindol-2-methyl-malonates with 2-bromoenals catalyzed by NHCs is described to afford functionalized azepino[1,2-a]indoles in high yields with excellent enantioselectivities. This method, in which the 3-formyl group in indoles acts as a necessary mediating group, provided cycloaddition products under mild conditions.
Concise synthesis of carbazole-1,4-quinones and evaluation of their antiproliferative activity against HCT-116 and HL-60 cells
Nishiyama, Takashi,Hatae, Noriyuki,Yoshimura, Teruki,Takaki, Sawa,Abe, Takumi,Ishikura, Minoru,Hibino, Satoshi,Choshi, Tominari
, p. 561 - 577 (2016)
We report a convenient synthesis of carbazole-1,4-quinone alkaloid koeniginequinones A and B using a tandem ring-closing metathesis with the dehydrogenation reaction sequence under an O2 atmosphere as an important step. Using this method, carbazole-1,4-quinones substituted at the 5-, 6-, 7-, and/or 8-positions have been synthesized. Moreover, 24 compounds, including koeniginequinones A and B, have been evaluated for their antiproliferative activity against HCT-116 and HL-60 cells, and the 6-nitro analog exhibited the most potent activity against both tumor cell types.
Organocatalytic cascade aldimine condensation/[1,6]-hydride transfer/Mannich-type cyclization: Sustainable access to indole-2,3-fused diazocanes
An, Xiao-De,Dong, Pei-Zhen,Liu, Rui-Bin,Qiu, Bin,Wang, Lin-Xuan,Xiao, Jian
, p. 8181 - 8186 (2021/11/01)
An unprecedented organocatalytic cascade aldimine condensation/[1,6]-hydride transfer/Mannich-type cyclization of indole-2-carbaldehydes with o-aminoanilines was developed to assemble polycyclic indole-2,3-fused diazocanes in one step. This novel methodol
