Journal
EUROPEAN JOURNAL OF ORGANIC CHEMISTRY
Volume 2017, Issue 44, Pages 6518-6524Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/ejoc.201700833
Keywords
Continuous flow; N heterocycles; Flow chemistry; Desulfurization; Etomidate analgesic; Synthetic methods
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Funding
- Royal Society
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A simple yet robust flow set-up for the efficient desulfurization of a series of thioimidazoles is presented, which generates the corresponding imidazole derivatives in high yields. The strategic choice of peristaltic over piston pumps allowed reliable delivery of the heterogeneous stream of the thioimidazole substrate into a T-piece where it reacted with NaNO2 in the presence of acetic acid. This approach enabled the controlled and safe formation of the reactive nitrosonium species without uncontrolled exposure to hazardous nitrous oxide by-products as observed in related batch protocols. The value of the resulting imidazole products was further demonstrated by their conversion into various esters representing new derivatives of the known analgesic etomidate through an efficient one-pot Corey-Gilman-Ganem oxidation procedure.
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