Chakraborty N, Das B, Barik D, Rajbongshi KK, Patel BK. Base-Promoted Synthesis of
S-Arylisothiazolones via Intramolecular Dehydrative Cyclization of α-Keto-
N-acylsulfoximines.
J Org Chem 2024;
89:778-783. [PMID:
38096382 DOI:
10.1021/acs.joc.3c02269]
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Abstract
A base (Et3N)-promoted synthesis of 1,4-diarylisothiazolones from α-keto-N-acylsulfoximines has been achieved. The reaction proceeds via α-hydrogen abstraction from sulfoximine, followed by an intramolecular nucleophilic attack at the keto carbonyl to form a tert-hydroxy isothiazolone intermediate. The 1,4-substituted isothiazolone is obtained after dehydration via an E1cB path. This one-pot synthesis of isothiazolinones has a broad substrate scope, has a high atom economy, and provides products with good yields. The ΔELUMO-HOMO is calculated using Gaussian 16 at the B3LYP/6-31G(d,p) level of theory.
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