On-Water Synthesis of 2-Substituted Quinolines from 2-Aminochalcones Using Benzylamine as the Nucleophilic Catalyst
作者:So Young Lee、Cheol-Hong Cheon
DOI:10.1021/acs.joc.8b01675
日期:2018.11.2
On-water synthesis of 2-substituted quinolines from 2-aminochalcone derivatives was developed using benzylamine as the nucleophilic catalyst. Various 2-aminochalcones could be applied to this protocol, and the desired 2-substituted quinoline products were isolated in excellent yields by simple filtration. Furthermore, we elucidated the role of benzylamine in this transformation and provided the detailed
A new cross‐cycloaddition reaction between a wide range of isocyanides and 2‐isocyanochalcones (or analogues) was developed for the expeditious synthesis of pyrrolo[3,4‐b]indoles under thermal conditions. On the basis of the experimental results and DFT calculations, a mechanism for this domino reaction is proposed involving chemoselective heterodimerization of two different isocyanides to form 1,4‐diazabutatriene
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‐Butoxide‐Mediated Synthesis of 3,4′‐Biquinolines from 2‐Aminochalcones
作者:Jiye Jeon、So Young Lee、Cheol‐Hong Cheon
DOI:10.1002/adsc.201900029
日期:2019.5.14
protocol to synthesize 3,4’‐biquinolinesfrom2‐aminochalcones in the presence of a stoichiometric amount of sodium tert‐butoxide as the nucleophilic promotor was developed. Conjugate addition of tert‐butoxide to 2‐aminochalcones provided the corresponding enolates, which underwent Michael addition to another molecule of 2‐aminochalcone to afford a dimeric species of 2‐aminochalcones. Subsequent cyclization
An efficient asymmetric intramolecular trapping of ammonium ylides of α-diazoketones with enones to synthesize indoline derivatives was realized. A Rh(II)/chiralN,N′-dioxide−Sc(III) complex bimetallic relay catalytic system was established. A series of optically active 2,2,3-trisubstituted indolines were obtained in high yields (up to 99%), good enantioselectivities (up to 99% ee), and excellent
Carbon Nanotube-Ruthenium Hybrids for the Partial Reduction of 2-Nitrochalcones: Easy Access to Quinoline<i>N</i>-Oxides
作者:Pallabita Basu、Praveen Prakash、Edmond Gravel、Nimesh Shah、Kalisankar Bera、Eric Doris、Irishi N. N. Namboothiri
DOI:10.1002/cctc.201600042
日期:2016.4.6
ruthenium–carbon nanotube nanohybrid was employed as a catalyst in the tandem transformation of nitrochalcones into quinoline N‐oxides. Partial reduction of the nitro group to a hydroxylamine, followed by in situ intramolecular condensation to the carbonyl afforded the quinoline‐N‐oxides in satisfactory to good yields. Reduction of the nitro group was selective and independent of changes in the reaction conditions