Journal ArticleDOI
Dimethylformamide as a carbon monoxide source in fast palladium-catalyzed aminocarbonylations of aryl bromides
TLDR
The carbonylation procedure reported herein, which relies on the in situ generation of carbon monoxide, serves as a convenient alternative to othercarbonylation methods and is particularly applicable to small-scale reactions where short reaction times are desired and the direct use of carbonmonoxide gas is impractical.Abstract:
Dimethylformamide (DMF) acts as an efficient source of carbon monoxide and dimethylamine in the palladium-catalyzed aminocarbonylation (Heck carbonylation) of p-tolyl bromide to provide the dimethylamide. Addition of amines to the reaction mixture in excess delivers the corresponding aryl amides in good yields. The amines employed, benzylamine, morpholine, and aniline, all constitute good reaction partners. The reaction proceeds smoothly with bromobenzene and more electron-rich aryl bromides, but electron-deficient aryl bromides fail to undergo aminocarbonylation. The reactions are conducted at 180-190 degrees C for 15-20 min with microwave heating in a reaction mixture containing imidazole and potassium tert-butoxide: the latter is required to promote decomposition of the DMF solvent at a suitable rate. The beneficial effects of controlled microwave irradiation as an energy source for the rapid heating of the carbonylation reaction mixture are demonstrated. The carbonylation procedure reported herein, which relies on the in situ generation of carbon monoxide, serves as a convenient alternative to other carbonylation methods and is particularly applicable to small-scale reactions where short reaction times are desired and the direct use of carbon monoxide gas is impractical.read more
Citations
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Journal ArticleDOI
Carbonylative synthesis of heterocycles involving diverse CO surrogates.
TL;DR: This feature article will mainly focus on heterocycle syntheses involving CO surrogates, including formic acid, formates, molybdenum hexacarbonyl, etc.
Journal ArticleDOI
Benzene-1,3,5-triyl triformate (TFBen): a convenient, efficient, and non-reacting CO source in carbonylation reactions
TL;DR: In this paper, the TFBen was used as a non-reacting CO source for carbonylation reactions in the presence of Phloroglucinol (1,3,5-trihydroxybenzene) as a reusable material for TFBen synthesis.
Journal ArticleDOI
N,N-Dimethylformamid: ein vielseitiger Baustein für die Synthese
TL;DR: In this article, a Kurzaufsatz fasst die Verwendung von DMF als Allzweck Vorstufe zusammen and stellt die neuen Entwicklungen bei Formylierungen, Aminocarbonylierungens, Aminierungen and in der Reaktion mit Arinen vor.
Journal ArticleDOI
Regioselective Pd‐Catalyzed Methoxycarbonylation of Alkenes Using both Paraformaldehyde and Methanol as CO Surrogates
Qiang Liu,Kedong Yuan,Kedong Yuan,Percia Beatrice Arockiam,Robert Franke,Henri Doucet,Ralf Jackstell,Matthias Beller +7 more
TL;DR: The first regioselective methoxycarbonylation of alkenes with paraformaldehyde and methanol as CO substitutes is reported, applicable to a series ofAlkenes in the presence of a palladium catalyst under relatively mild conditions and is highly atom efficient.
Journal ArticleDOI
Evaluation of a Nonresonant Microwave Applicator for Continuous-Flow Chemistry Applications
TL;DR: In this article, a nonresonant microwave applicator for continuous-flow organic chemistry is introduced and evaluated, where the frequency of the incident microwave radiation can be adjusted between 2.4 and 2.5 GHz to optimize the energy absorbance.
References
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Journal ArticleDOI
Progress in hydroformylation and carbonylation
TL;DR: The last 15 years of hydroformylation and carbonylation chemistry are reviewed in this article, including technical and commercial aspects, and the authors present a review of the most relevant papers.
Journal ArticleDOI
Developments in Microwave-Assisted Organic Chemistry
TL;DR: The CSIRO continuous microwave reactor (CMR) and microwave batch reactor (MBR) were developed for organic synthesis and operated at temperatures up to 200°C (1400 kPa) and 260°C(10 MPa) respectively as discussed by the authors.
Journal ArticleDOI
Microwave-assisted high-speed chemistry: a new technique in drug discovery.
Mats Larhed,Anders Hallberg +1 more
TL;DR: It is believed that the time saved by using focused microwaves is potentially important in traditional organic synthesis but could be of even greater importance in high-speed combinatorial and medicinal chemistry.
Journal ArticleDOI
Microwave-Promoted Palladium-Catalyzed Coupling Reactions
Mats Larhed,Anders Hallberg +1 more
Journal ArticleDOI
Fast Microwave-Assisted Preparation of Aryl and Vinyl Nitriles and the Corresponding Tetrazoles from Organo-halides
Mathias Alterman,Anders Hallberg +1 more
TL;DR: A very potent HIV-1 protease inhibitor (K(i) = 0.
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