Rhodium-Catalyzed Enantioselective Cyclization of 3-Allenyl-indoles: Access to Functionalized Tetrahydrocarbazoles
作者:Christian P. Grugel、Bernhard Breit
DOI:10.1021/acs.orglett.9b01721
日期:2019.8.2
A highly selective rhodium-catalyzedcyclization of tethered 3-allenylindoles is reported. In a smooth reaction, 1-vinyltetrahydrocarbazoles are obtained in excellent yields and enantioselectivities. Aside from a great functional group tolerance, this method requires neither the Schlenk technique nor the use of anhydrous solvents. Preliminary mechanistic investigations proved that the reaction proceeds
Rhodium-Catalyzed Diastereo- and Enantioselective Tandem Spirocyclization/Reduction of 3-Allenylindoles: Access to Functionalized Vinylic Spiroindolines
作者:Christian P. Grugel、Bernhard Breit
DOI:10.1021/acs.orglett.9b03835
日期:2019.12.6
A highly selective rhodium-catalyzed tandem spirocyclization/reduction of 3-allenylindoles is reported. By employing a Hantzsch ester as reductant, vinylic spiroindolines are obtained in excellent yields as well as diastereo- and enantioselectivity. In addition, the reaction’s synthetic utility is highlighted by broad functional group compatibility and exemplified by a gram scale reaction with subsequent
Polyethylene glycol (PEG-200)-promoted sustainable one-pot three-component synthesis of 3-indole derivatives in water
作者:Leilei Wang、Manna Huang、Xinhai Zhu、Yiqian Wan
DOI:10.1016/j.apcata.2012.12.008
日期:2013.3
A sustainable three-component reaction of indoles, aldehydes, and malononitrile in water promoted by polyethyleneglycol (PEG-200) afforded 3-indole derivatives in good to excellent yields.
One-Pot Asymmetric Synthesis of Seven-Membered Carbocycles Cyclohepta[<i>b</i>]indoles via a Sequential Organocatalytic Michael/Double Friedel–Crafts Alkylation Reaction
作者:Nitin S. Dange、Bor-Cherng Hong、Chih-Ching Lee、Gene-Hsiang Lee
DOI:10.1021/ol4016749
日期:2013.8.2
enantioselective synthesis of highly functionalized cyclohepta[b]indoles with high enantioselectivity (up to 96% ee). The process combines an enantioselective organocatalytic Michael addition and a highly efficient double Friedel–Crafts reaction sequence in one pot with good yields and stereoselectivity. The structures and absolute configurations of the products were confirmed by X-ray analysis.
已开发出一种新方法,用于对映选择性合成具有高对映选择性(最高ee为96%)的高度官能化的环庚[ b ]吲哚。该方法在一锅中结合了对映选择性有机催化迈克尔加成反应和高效的双重Friedel-Crafts反应顺序,并具有良好的收率和立体选择性。通过X射线分析确认了产物的结构和绝对构型。
Visible‐Light‐Induced [2+2+1] Dearomative Cascade Cyclization of Indole/Furan Alkynes to Synthesize Sulfonyl Polycycles
作者:Jiajun Luo、Guohui Zeng、Xiaohui Cao、Biaolin Yin
DOI:10.1002/adsc.202200331
日期:2022.7.5
visible-light-induced [2+2+1] dearomativecascade cyclization of indole/furan alkynes with NaHSO3, providing an array of diverse highly strained sulfonyl polycycles. Compared to our previous work, this method does not require the use of additional sacrificial oxidants and have wider reaction scope. Preliminary mechanistic studies suggest that the indole moiety initiated the reaction, which proceeded via single-electron