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Amination of Aryl Halides and Esters Using Intensified Continuous Flow Processing.

Amination of Aryl Halides and Esters Using Intensified Continuous Flow Processing.

Molecules (Basel, Switzerland) (2015-10-02)

Thomas M Kohl, Christian H Hornung, John Tsanaktsidis

ABSTRACT

Significant process intensification of the amination reactions of aryl halides and esters has been demonstrated using continuous flow processing. Using this technology traditionally difficult amination reactions have been performed safely at elevated temperatures. These reactions were successfully conducted on laboratory scale coil reactor modules with 1 mm internal diameter (ID) and on a preparatory scale tubular reactor with 6 mm ID containing static mixers.

MATERIALS

Product Number

Brand

Product Description

Sigma-Aldrich

Methanol, suitable for NMR (reference standard)

Sigma-Aldrich

Methylamine solution, 33 wt. % in absolute ethanol ((denatured with 1% toluene))

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Methylamine solution, 40 wt. % in H₂O

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Methylamine solution, 2.0 M in methanol

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Methanol, puriss. p.a., ACS reagent, reag. ISO, reag. Ph. Eur., ≥99.8% (GC)

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Methanol, ACS reagent, ≥99.8%

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Methanol, BioReagent, ≥99.93%

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Dichloromethane, ACS reagent, ≥99.5%, contains 40-150 ppm amylene as stabilizer

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2-Propanol, Laboratory Reagent, ≥99.5%

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2-Propanol, BioUltra, Molecular Biology, ≥99.5% (GC)

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Dimethyl sulfoxide, anhydrous, ≥99.9%

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Methyl 3-mercaptopropionate, 98%

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Dimethyl sulfoxide, BioUltra, Molecular Biology, ≥99.5% (GC)

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Dichloromethane, anhydrous, ≥99.8%, contains 40-150 ppm amylene as stabilizer

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2-Propanol, anhydrous, 99.5%

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4-Bromopyridine hydrochloride, 99%

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2-Propanol, BioReagent, ≥99.5%, Molecular Biology