Kazmierczak JC, Cargnelutti R, Barcellos T, Silveira CC, Schumacher RF. Selective synthesis of α-organylthio esters and α-organylthio ketones from β-keto esters and sodium
S-organyl sulfurothioates under basic conditions.
Beilstein J Org Chem 2021;
17:234-244. [PMID:
33564334 PMCID:
PMC7849251 DOI:
10.3762/bjoc.17.24]
[Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/10/2020] [Accepted: 01/07/2021] [Indexed: 11/23/2022] Open
Abstract
We described herein a selective method to prepare α-organylthio esters and α-organylthio ketones by the reaction of β-keto esters with sodium S-benzyl sulfurothioate or sodium S-alkyl sulfurothioate (Bunte salts) under basic conditions in toluene as the solvent at 100 °C. When 4 equivalents of a base were used, a series of differently substituted α-thio esters were obtained with up to 90% yield. On the other hand, employing 2 equivalents of a base, α-thio ketones were achieved after 18 h under air. Furthermore, after a shorter reaction time, the isolation of keto-enol tautomers was possible, revealing them as significant intermediates for the mechanism elucidation.
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