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Preparation of oxazolines and oxazoles via a PhI(OAc)2-promoted cyclization of N-propargylamides

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Abstract

A metal-free cyclization of N-propargylamides for the synthesis of various oxazolines and oxazoles via a 5-exo-dig process is presented. Using (diacetoxyiodo)benzene (PIDA) as a reaction promoter and lithium iodide (LiI) as an iodine source, intramolecular iodooxygenation of N-propargylamides proceeded readily, leading to the corresponding (E)-5-iodomethylene-2-oxazolines in good to excellent isolated yields. In addition, using the PhI(OAc)2/LiI system, N-propargylamides can be converted to the corresponding oxazole-5-carbaldehydes in the presence of oxygen under visible light irradiation. The resulting products can be further converted into various oxazoline and oxazole derivatives after simple derivatizations, and this method ultimately offers an efficient route to a variety of biologically active structures.

Graphical abstract: Preparation of oxazolines and oxazoles via a PhI(OAc)2-promoted cyclization of N-propargylamides

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Publication details

The article was received on 21 Jun 2018, accepted on 13 Sep 2018 and first published on 13 Sep 2018


Article type: Paper
DOI: 10.1039/C8OB01474D
Citation: Org. Biomol. Chem., 2018, Advance Article
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    Preparation of oxazolines and oxazoles via a PhI(OAc)2-promoted cyclization of N-propargylamides

    W. Yi, Q. Liu, X. Fang, S. Lou and G. Liu, Org. Biomol. Chem., 2018, Advance Article , DOI: 10.1039/C8OB01474D

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