4.8 Article

Thiocyanatoarylation of Methyl Vinyl Ketone under Meerwein Conditions for the Synthesis of 2-Aminothiazole-Based Heterocyclic Systems

Journal

ORGANIC LETTERS
Volume 24, Issue 25, Pages 4575-4579

Publisher

AMER CHEMICAL SOC
DOI: 10.1021/acs.orglett.2c01677

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In this study, a series of organic compounds containing functional groups such as thiocyanate and thiazolone were prepared via reactions catalyzed by copper(II), and the reaction processes and yields were detailed. The first representatives of a new heterocyclic system were also reported.
4-Aryl-3-thiocyanatobutan-2-ones were prepared by Meerwein reactions from methyl vinyl ketone and aryldiazonium salts under copper(II) catalysis in 35-75% yields. alpha-Thiocyanato ketones regioselectively react with 1-methyl-3-aminopyrazole forming N-(3-pyrazolyl)-substituted 2-aminothiazoles in 80-91% yields. An ester group in position 3 of the pyrazole induced a regioselective ring-closure reaction followed by an intramolecular cyclization, which gave first representatives of a new heterocyclic system, pyrazolo[4,3-e]thiazolo-[3,2-a]pyrimidine, in 74-93% yields. In addition, the preparations of 5-benzyl-4-methylthiazol-2-ones in 84-93% yields are described.

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