Palladium‐Catalyzed Domino Synthesis of 2,3‐Difunctionalized Indoles
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Migratory Insertion of Isocyanides in Batch and Continuous Flow
作者:Su Chen、Monica Oliva、Luc Van Meervelt、Erik V. Van der Eycken、Upendra K. Sharma
DOI:10.1002/adsc.202100339
日期:2021.7
We report, herein, a palladium-catalyzed cascade comprising carbopalladation, migratoryinsertion of isocyanide and triple bond activation followed by a nucleophilic attack (OR−) to construct difunctionalized acyl indoles. The process involves multiple bond formations via key palladium-chemistry steps, to construct these bis-heterocycles containing two privileged scaffolds (indole and oxindole) in
Cycloisomerization is an atom economic procedure that converts dienes and enynes into cyclic molecules. To date, cycloisomerization between enamides and silylalkynes has not been explored. We found that N-acyl-N-vinyl-2-silylalkynylaniline derivatives undergo a cycloisomerization in the presence of a well-defined ruthenium hydride to give a 2,3-disubstitued indole. The vinyl and silylmethyl substituents
New Access to 2,3-Disubstituted Quinolines through Cyclization of <i>o</i>-Alkynylisocyanobenzenes
作者:Michinori Suginome、Takeshi Fukuda、Yoshihiko Ito
DOI:10.1021/ol991133w
日期:1999.12.1
[GRAPHICS]o-Alkynylisocyanobenzenes underwent nucleophile-induced intramolecular cyclization to give 2,3-disubstituted quinoline derivatives in high yields. In addition to the oxygen and nitrogen nucleophiles such as methanol and diethylamine, the nucleophilic carbon of the enolate of malonate induced the cyclization effectively. Reaction of 1,4-di(trimethylsilylethynyl)-2,3-diisocyanobenzene with methanol afforded 2,9-dimethoxy-1,10-phenanthroline in good yield.
Cascades to Substituted Indoles
作者:Jon D. Rainier、Abigail R. Kennedy
DOI:10.1021/jo000831n
日期:2000.9.1
This paper describes the synthesis of dithioindoles from the free-radical cyclizations of arylisonitriles having pendant alkynes. Also described is the synthesis of substituted indoles and spiro-fused indoles from the coupling of dithioindoles with active hydrogen-containing compounds.
Tetrabutylammonium chloride-triggered 6-endo cyclization of o-alkynylisocyanobenzenes: an efficient synthesis of 2-chloro-3-substituted quinolines
A highly efficient one-pot synthesis of 2-chloro-3-substituted quinolines has been developed by tetrabutylammonium chloride-triggered 6-endo cyclization of o-alkynylisocyanobenzenes, which are generated in situ by dehydration of the corresponding N-(2-ethynylphenyl)formamides. (C) 2009 Elsevier Ltd. All rights reserved.