Journal
ORGANIC LETTERS
Volume 13, Issue 13, Pages 3442-3445Publisher
AMER CHEMICAL SOC
DOI: 10.1021/ol201188d
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- Royal Thai Government
- Royal Society
- EPSRC
- Royal Society of Chemistry
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CuCl2, in the presence of a 2-ethyl-2-oxazoline ligand, is an effective catalyst for the room temperature, aerobic oxidation of hydroxamic acids and hydrazides, to acyl-nitroso and azo dienophiles respectively, which are efficiently trapped in situ via both inter- and intramolecular hetero-Diels-Alder reactions with dimes. Both inter- and intramolecular variants of the Diels-Alder reaction are suitable under the reaction conditions using a variety of solvents. Under the same conditions, an acyl hydrazide Was also oxidized to give an acyl-azo dienophile which was trapped intramolecularly by a diene.
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