I2-promoted direct one-pot synthesis of 2,2-bisindolyl-1-arylethanones from multiform substrates arylethenes, 2-hydroxy-aromatic ketones, and carbinols
摘要:
An I-2-promoted domino protocol was developed to construct 2,2-bisindolyl-1-arylethanones from multiform substrates arylethenes, 2-hydroxy-aromatic ketones, and carbinols via three distinct pathways. Through a logical coupled oxidation/Friedel-Crafts alkylation domino process, a variety of 2,2-bisindolyl-1-arylethanones were synthesized in one-pot. (C) 2013 Elsevier Ltd. All rights reserved.
Gold-catalyzed oxidation of terminal alkynes to glyoxals and their reactions with 2-phenylimidazo[1,2-<i>a</i>]pyridines: one-pot synthesis of 1,2-diones
作者:Shengrong Liao、Huayan Xu、Bin Yang、Junfeng Wang、Xuefeng Zhou、Xiuping Lin、Yonghong Liu
DOI:10.1039/d1ob01507a
日期:——
A novel one-pot protocol for the convenient and efficient synthesis of (2-phenylimidazo[1,2-a]pyridin-3-yl)alkane-1,2-diones (3) in good yields (32–88%) from 2-phenylimidazo[1,2-a]pyridines (1) and terminalalkynes (2) has been established with a wide range of substrate scope. A tandem reaction sequence containing gold-catalyzed double oxidations of terminalalkynes to generate glyoxals, nucleophilic
一种新颖的一锅法,可方便有效地合成 (2-苯基咪唑并[1,2- a ]吡啶-3-基)烷烃-1,2-二酮 ( 3 ),产率 (32–88%) 2-苯基咪唑并[1,2- a ]吡啶( 1 )和末端炔烃( 2 )已被建立,具有广泛的底物范围。串联反应序列包含金催化末端炔烃的双氧化以生成乙二醛,将 2-苯基咪唑并[1,2- a ]吡啶亲核加成到乙二醛以生成 α-羟基酮,以及将 α-羟基酮氧化以提供最终产品3该方法涉及在空气气氛下。简单的操作、温和的反应条件和广泛可用的底物使这种策略更实惠。
Photoredox Generated Vinyl Radicals: Synthesis of Bisindoles and β-Carbolines
作者:Neha Chalotra、Ajaz Ahmed、Masood Ahmad Rizvi、Zakir Hussain、Qazi Naveed Ahmed、Bhahwal Ali Shah
DOI:10.1021/acs.joc.8b02193
日期:2018.12.7
A photoredox catalyzed approach enabling use of alkynes as surrogate of 2-oxoaldehydes/1,2-diones is reported. The method overcomes the difficulty associated with application of unsubstituted aliphatic α-oxoaldehydes, which has hitherto limited their general use. Indoles, tryptamine, and tryptophan methyl ester participated in the reaction to give a variety of α-oxo based analogues. Quantum yield investigations
A molecular I-2-promoted sp(3) C-H bond dual-(het)arylation protocol was developed for the synthesis of 2,2-bisindolyl-1-arylethanones. Through a logical design, three mechanism-different reactions (iodination, Kornblum oxidation, and Friedel Crafts reaction) were assembled in a single reactor. A variety of 2,2-bisindolyl-1-aryl ethanones were synthesized from simple and readily available aryl methyl ketones and indoles. In the reaction, metal, base, and ligand were all avoidable.
Gold-Catalyzed Synthesis of 1-(Indol-3-yl)carbazoles: Selective 1,2-Alkyl vs 1,2-Vinyl Migration
Gold(III)-catalyzed cycloisomerization of α-bis(indol-3-yl)methyl alkynols selectively affords 1-(indol-3-yl)carbazoles, in a transformation that takes place through a selective 1,2-alkyl vs 1,2-vinyl migration step in the vinyl-gold intermediate generated from the initial 5-endo-spirocyclization. The reaction proceeds well with either tertiary or secondary starting alkynols as well as with a wide
I2-promoted direct one-pot synthesis of 2,2-bisindolyl-1-arylethanones from multiform substrates arylethenes, 2-hydroxy-aromatic ketones, and carbinols
An I-2-promoted domino protocol was developed to construct 2,2-bisindolyl-1-arylethanones from multiform substrates arylethenes, 2-hydroxy-aromatic ketones, and carbinols via three distinct pathways. Through a logical coupled oxidation/Friedel-Crafts alkylation domino process, a variety of 2,2-bisindolyl-1-arylethanones were synthesized in one-pot. (C) 2013 Elsevier Ltd. All rights reserved.