Metal-Free Electrophilic Phosphination/Cyclization of Alkynes
作者:Yuto Unoh、Koji Hirano、Masahiro Miura
DOI:10.1021/jacs.7b02977
日期:2017.5.3
A metal-free electrophilicphosphination reaction has been developed. Electrophilic phosphorus species generated in situ from secondary phosphine oxides and Tf2O smoothly couple with alkynes possessing pendant nucleophiles to afford the corresponding phosphinated cyclization products in good yield. Preliminary NMR studies show that phosphirenium species may be involved as intermediates of the cyclization
Synthesis of Tetrahydro-1<i>H</i>-indeno[1,2-<i>b</i>]pyridine via Cascade Cyclization and Friedel–Crafts Reaction
作者:Upasana Borthakur、Madhurjya Borah、Manash J. Deka、Anil K. Saikia
DOI:10.1021/acs.joc.6b00988
日期:2016.10.7
A convenient protocol has been established for the synthesis of 1-tosyl-2,3,4,5-tetrahydro-1H-indeno[1,2-b]pyridine via cascade cyclization and Friedel–Craftsreaction of 4-methyl-N-(pent-4-yn-1-yl)benzenesulfonamides and aldehydes in good yields. The methodology has been used for the total synthesis of the antidepressant agent (±)-5-phenyl-2,3,4,4a,5,9b-hexahydro-1H-indeno[1,2-b]pyridine.
已经建立了通过级联环化和4-甲基-N的Friedel-Crafts反应合成1-tosyl-2,3,4,5-四氢-1 H-茚并[1,2- b ]吡啶的简便方法-(pent-4-yn-1-yl)苯磺酰胺和醛收率高。该方法已用于抗抑郁药(±)-5-苯基-2,3,4,4a,5,9b-六氢-1 H-茚并[1,2- b ]吡啶的全合成。
Photoredox-Catalyzed Trifluoromethylative Intramolecular Cyclization: Synthesis of CF<sub>3</sub>-Containing Heterocyclic Compounds
作者:Hong Sik Han、Eun Hye Oh、Young-Sik Jung、Soo Bong Han
DOI:10.1021/acs.orglett.8b00648
日期:2018.4.6
A general photoredox-catalyzed intramolecularcyclization was developed for the synthesis of trifluoromethylated heterocyclic compounds. The reaction proceeded smoothly under mild photocatalytic conditions with high functional group tolerance, allowing the preparation of oxygen-, sulfur-, or nitrogen-containing heterocycles of different sizes. The broad substrate scope demonstrated the complexity-building
activation reactions for the development of efficientmacrocyclization processes, the ruthenium(II)‐catalyzed cyclization of O‐methyl benzhydroxamates possessing an ω‐acetylenic chain was investigated to access new structurally diverse macrocyclic isoquinolones. A slow addition of the substrate and the presence of Cu(OAc)2⋅H2O as an additive were crucial for the success of the macrocyclization that features
Synthesis of Indoles via Diethylzinc-Mediated Intramolecular Hydroamination Reactions of Alkynyl Sulfonamides
作者:Gang Zhao、Yan Yin、Zhuo Chai、Wen-Ying Ma
DOI:10.1055/s-0028-1083236
日期:2008.12
A series of indole derivatives were synthesized through the intramolecular hydroamination of alkynyl sulfonamides using 20 mol% of diethylzinc as the catalyst. A tandem cyclization-nucleophilic addition reaction was also possible to afford C2,C3-disubstituted indoles using 120 mol% of diethylzinc.