Gold-Catalyzed Reactions of 2-Alkynyl-phenylamines with α,β-Enones
摘要:
The gold-catalyzed reaction of 2-alkynyl-phenylamines with alpha,beta-enones represents a new general one-pot entry into C-3-alkyl-indoles by sequential reactions. Gold-catalyzed sequential cyclization/alkylation, N-alkylation/cyclization, or N-alkylation/cyclization/alkylation reactions leading to different indoles can be directed by changing the 2-alkynyl-phenylamine 1/alpha,beta-enone 3 ratio and the reaction temperature. Unusual gold-catalyzed rearrangement reaction of indoles are observed at 140 degrees C. New gold-catalyzed formation of propargyl-alkyl ether under mild conditions and the hydration reaction of N-acetyl-2-ethynyl-phenylamine are reported.
Syntheses of <i>N</i>-Alkyl 2-Arylindoles from Saturated Ketones and 2-Arylethynylanilines via Cu-Catalyzed Sequential Dehydrogenation/Aza-Michael Addition/Annulation Cascade
We describe here a Cu-catalyzed and 4-OH-TEMPO-mediated sequential dehydrogenation/aza-Michael addition/annulation cascade reaction for the construction of N-alkyl 2-arylindoles from facilely available saturatedketones and 2-arylethynylanilines. This reaction shows high regioselectivity and tolerates a variety of functional groups. Moreover, 3-alkyl-substituted indoles can also be achieved when using
Ruthenium-Catalyzed Selective C−C Coupling of Allylic Alcohols with Free Indoles: Influence of the Metal Catalyst
作者:Ying-Qi Xia、Chao Li、Man Liu、Lin Dong
DOI:10.1002/chem.201706080
日期:2018.4.11
Versatile reactive activities of allyl alcohols with free indoles in C-H functionalization reactions were investigated. Direct alkylation or cascade cyclization reactions could be selectively controlled based on the catalyst system: Ru(PPh3 )3 Cl2 provided C3-substituted β-ketone indoles whereas [Ru(p-cymene)Cl2 ]2 yielded cyclized indoles.
3-Unsubstituted indoles undergo regioselective alkylation at the 3-position of the indole nucleus throughgold-catalyzed conjugated addition type reaction with α,β-enones. 3-Substituted indoles undergo C-2 alkylation. Sequential C-3/C-2 gold catalyzed alkylation of the indole with dibenzylidene acetone gives a polycyclic indole b-annulated with a seven-membered cycle.
3-未取代的吲哚通过金催化的与α,β-烯酮的共轭加成反应在吲哚核的3-位发生区域选择性烷基化。3-取代的吲哚经历 C-2 烷基化。用二亚苄基丙酮对吲哚进行连续的 C-3/C-2 金催化烷基化得到多环吲哚 b 环,并具有七元环。
Samarium triiodide-catalyzed conjugate addition of indoles with electron-deficient olefins
作者:Zhuang-Ping Zhan、Rui-Feng Yang、Kai Lang
DOI:10.1016/j.tetlet.2005.03.174
日期:2005.5
The SmI3-catalyzed reaction of indoles with electron-deficient olefins generated the corresponding Michael adducts in high yields. The substitution on the indole nucleus occurred exclusively at the 3-position and N-alkylation products have not been observed.
Microwave-Accelerated Samarium Triiodide Catalyzed Conjugate Addition of Indoles with Electron-Deficient Olefins
作者:Zhuang-Ping Zhan、Kai Lang
DOI:10.1055/s-2005-869849
日期:——
A fast, efficient, environmentally benign, solvent-free procedure under microwave irradiation, using silica gel supported reagents, for the samarium triiodide catalyzed conjugated addition of indoles with electron-deficientolefins has been developed.