One-Pot Synthesis of 2,4-Disubstituted Indoles fromN-Tosyl-2,3-dichloroaniline Using Palladium–Dihydroxyterphenylphosphine Catalyst
摘要:
4-Chloroindoles were synthesized from readily available 2,3-dichloroaniline derivatives and terminal alkynes. The catalyst composed of palladium and dicyclohexyl(dihydroxyterphenyl)phosphine (Cy-DHTP) enabled ortho-selective Sonogashira coupling, and subsequent cyclization afforded 4-chloroindoles in high yields. This transformation was successfully applied to the one-pot synthesis of 2,4-disubstituted indoles via Suzuki-Miyaura coupling after indole formation.
Silver(I)-Mediated CH Amination of 2-Alkenylanilines: Unique Solvent-Dependent Migratory Aptitude
作者:So Won Youn、Tae Yun Ko、Min Jung Jang、Su San Jang
DOI:10.1002/adsc.201400759
日期:2015.1.12
A highly effective silver(I)‐mediated CHamination of 2‐alkenylanilines has been developed to afford a diverse range of substituted indoles. High functional group tolerance, broad substrate scope, simple/fast/high‐yielding reaction, and recovery/reuse of the inexpensive silver oxidant are noteworthy. Furthermore, an uncommon migratory process of β‐monosubstituted 2‐alkenylanilines with solvent‐dependence
Et<sub>2</sub>Zn-Catalyzed Intramolecular Hydroamination of Alkynyl Sulfonamides and the Related Tandem Cyclization/Addition Reaction
作者:Yan Yin、Wenying Ma、Zhuo Chai、Gang Zhao
DOI:10.1021/jo070681h
日期:2007.7.1
Intramolecularhydroamination of alkynyl amides was effected by a catalytic amount of Et2Zn (20 mol %) to form indole derivatives, and a tandem cyclization/nucleophilic addition procedure involving reaction of the indole zinc salt intermediate with acid chlorides or halides was developed to provide an efficient approach to C3-substituted indole derivatives when an excess of Et2Zn (120 mol %) was used
Supported palladium nanoparticles-catalyzed decarboxylative coupling approaches to aryl alkynes, indoles and pyrrolines synthesis
作者:C. Bal Reddy、Richa Bharti、Sandeep Kumar、Pralay Das
DOI:10.1039/c6ra12046f
日期:——
The polystyrene supported palladium (Pd@PS) nanoparticles (NPs) catalyzed decarboxylative coupling (DC) of arylhalides and alkynyl carboxylic acids was developed for the synthesis of diaryl alkynes. Indole and 3-pyrroline heterocycles were also synthesized from 2-iodo anilines/amino benzocycloheptene bromide and alkynyl carboxylic acids, following a domino decarboxylative coupling-cyclization (DCC)
Abstract The cyclization reaction of 2-ethynyl- N -sulfonylanilides proceeded efficiently in water with the presence of a catalytic amount of K 2 CO 3 under transition metal-free condition to give indoles in high yields. The recovery and reusability of the present catalytic system were investigated.
摘要在无过渡金属条件下,在催化量的K 2 CO 3存在下,2-乙炔基-N-磺酰腈在水中的环化反应有效地进行,从而获得了高产率的吲哚。研究了本催化体系的回收率和可重复使用性。
DMSO/SOCl<sub>2</sub>-mediated C(sp<sup>2</sup>)–H amination: switchable synthesis of 3-unsubstituted indole and 3-methylthioindole derivatives
作者:Jingran Zhang、Xiaoxian Li、Xuemin Li、Haofeng Shi、Fengxia Sun、Yunfei Du
DOI:10.1039/d0cc07453e
日期:——
The reaction of 2-alkenylanilines with SOCl2 in DMSO was found to selectively afford 3-unsubstituted indoles and 3-methylthioindoles. This switchable approach was found to be temperature-dependent: at room temperature, the reaction afforded 3-unsubstituted indoles through intramolecular cyclization and elimination; while at higher temperature, the reaction gave 3-methylthioindoles via further electrophilic