Journal
BEILSTEIN JOURNAL OF ORGANIC CHEMISTRY
Volume 7, Issue -, Pages 1360-1371Publisher
BEILSTEIN-INSTITUT
DOI: 10.3762/bjoc.7.160
Keywords
automated synthesis; continuous flow; microreactor; microwave; nucleophilic substitution; organic bases
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Whilst microwave heating has been widely demonstrated as a synthetically useful tool for rapid reaction screening, a microwave-absorbing solvent is often required in order to achieve efficient reactant heating. In comparison, microreactors can be readily heated and pressurised in order to super-heat the reaction mixture, meaning that microwave-transparent solvents can also be employed. To demonstrate the advantages associated with microreaction technology a series of SNAr reactions were performed under continuous flow by following previously developed microwave protocols as a starting point for the investigation. By this approach, an automated microreaction platform (Labtrix (R) S1) was employed for the continuous flow synthesis of diaryl ethers at 195 degrees C and 25 bar, affording a reduction in reaction time from tens of minutes to 60 s when compared with a stopped-flow microwave reactor.
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