Acid-Relayed Organocatalytic<i>exo</i>-Diels-Alder Cycloaddition of Cyclic Enones with 2-Vinyl-1<i>H</i>-indoles
作者:Ji-Wei Ren、Zhao-Fang Zhou、Jun-An Xiao、Xiao-Qing Chen、Hua Yang
DOI:10.1002/ejoc.201501619
日期:2016.3
With the aid of the hydrogen-bond relay of (S)-camphorsulfonic acid, the enantioselective exo-Diels–Alder cycloaddition of cyclic enones and 2-vinyl-1H-indoles catalyzed by prolinosulfonamide was developed. The corresponding Diels–Alder cycloadducts were readily obtained by a single recrystallization, free of column chromatography. Consequently, tetracyclic tetrahydrocarbazole ring systems with three
Efficient synthetic route toward biologically active γ-carboline derivatives
作者:Dattatray G. Hingane、Nikita P. Parekh、Ayesha Khan、Radhika S. Kusurkar
DOI:10.1080/00397911.2015.1103874
日期:2016.1.17
ABSTRACT An efficient and short route was established for the synthesis of anti-bovine viral diarrhea virus agents, namely 4-methyl-γ-carboline (SK4M) 1, 3-methyl-γ-carboline (SK3M) 2, 5-methyl-γ-carboline (SK5M) 3, and a new γ-carboline derivative 4, using thermal electrocyclization reaction as a key step. The evaluation of cytotoxicity of compound 4 against human cervical cancer cell line HeLa and
Ionic Diamine Rhodium Complex Catalyzed Reductive N-Heterocyclization of 2-Nitrovinylarenes
作者:Kazumi Okuro、Joanna Gurnham、Howard Alper
DOI:10.1021/jo200320k
日期:2011.6.3
Ionic diamine rhodiumcomplex (1) catalyzes the reductive N-cyclization of 2-vinylnitroarenes using carbon monoxide as a reducing agent to afford functionalized indoles. The catalytic system allows direct access to indoles with ester and ketone groups at the 2- or 3-position, in good yields.
<i>L</i>-Pyroglutamic Sulphonamide as Hydrogen-Bonding Organocatalyst: Enantioselective Diels–Alder Cyclization to Construct Carbazolespirooxindoles
作者:Ji-Wei Ren、Jing Wang、Jun-An Xiao、Jun Li、Hao-Yue Xiang、Xiao-Qing Chen、Hua Yang
DOI:10.1021/acs.joc.7b00733
日期:2017.6.16
applied in catalyzing asymmetric Diels–Aldercyclization of methyleneindolinones with 2-vinyl-1H-indoles to efficiently assemble carbazolespirooxindoles in excellent stereoselectivity (up to 99% ee, >20:1 dr) and yields (up to 99%). Mechanistic studies disclosed that the well-designed hydrogen-bonding modes between L-pyroglutamic sulphonamide and substrates were crucial for stereocontrol in the cyclization