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.
the corresponding bis-thiolated indolederivatives. The advantages of the reaction include metal-free, room-temperature, mild reaction conditions and broad functional group compatibility. The reaction proceeds via nucleophilic addition of an alkanethiol to an isonitrile moiety, 5-exo cyclization, followed by nucleophilic addition of an alkanethiol to a 3-alkylidene indole intermediate. Density functional
Synthesis of Allyl Cyanamides and <i>N</i>-Cyanoindoles via the Palladium-Catalyzed Three-Component Coupling Reaction
作者:Shin Kamijo、Yoshinori Yamamoto
DOI:10.1021/ja0272742
日期:2002.10.1
The palladium-catalyzedthree-componentcouplingreaction (TCCR) of aryl isocyanides, allyl methyl carbonate, and trimethylsilyl azide was conducted in the presence of Pd(2)(dba)(3).CHCl(3) (2.5 mol %) and dppe (1,2-bis(diphenylphosphino)ethane) (10 mol %). Allyl aryl cyanamides with a wide variety of functional groups were obtained in excellent yields. This palladium-catalyzed TCCR was further utilized
1,2-Azaboretidine formation in the reactions of (boryl)(silyl)iminomethanes via possible generation of (amino)(boryl)carbene species
作者:Michinori Suginome、Takeshi Fukuda、Yoshihiko Ito
DOI:10.1016/s0022-328x(01)01321-3
日期:2002.2
[Bis(diisopropylamino)boryl](organosilyl)(N-arylimino)methanes, which was formed in the reaction of aryl isocyanides with (organosilyl)bis(diisopropylamino)borane at room temperature, underwent new skeletal rearrangement reaction to provide aryl(1,2-azaboretidin-3-yl)(organosilyl)amines at 110 °C. Reaction of 1,2-diisocyanobenzene with the silylborane afforded 2-(organosilyl)-3-(1,2-azaboretidin-3-yl)-4
When a mixture of o-alkynylaryl isocyanides and organic dichalcogenides such as diselenides or ditellurides was irradiated with light of wavelength over 300 or 400 nm, the intramolecular cyclization of the isocyanides took place to afford the corresponding 2,4-bischalcogenated quinolines selectively. The photochemical cyclization of 2-(phenylethynyl)phenyl isocyanide could also proceed in the presence of hydrogen transfer reagents such as tris(trimethylsilyl)silane, tributylgermyl hydride, alkanethiols, and benzeneselenol, providing the corresponding 3-phenylquinoline as the result of 2,4-dihydrogenation.
Palladium‐Catalyzed Domino Synthesis of 2,3‐Difunctionalized Indoles
<i>via</i>
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