Inagaki S, Omichi R, Yamazaki K, Shibuta Y, Kawano T. Synthesis of 5-Amino-3(2
H)-furanones via
S-Methylation/Intramolecular Cyclization of γ-Sulfanylamides.
J Org Chem 2024;
89:6770-6782. [PMID:
38691345 DOI:
10.1021/acs.joc.4c00090]
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Abstract
The S-methylation/intramolecular cyclization of γ-sulfanylamide is depicted. Different methylating reagents were successfully employed for S-methylation, depending on the substituent pattern of the amide in the starting γ-sulfanylamides; trimethyloxonium tetrafluoroborate was used for N-aryl substituted γ-sulfanylamides, and the combination of methyl iodide and silver(I) tetrafluoroborate was used for N-alkyl substituted γ-sulfanylamides. When the resulting sulfonium salt was treated with DBU, it smoothly underwent intramolecular cyclization to produce a series of N-aryl, N-alkyl, N,N-dialkyl or N-alkyl-N-aryl substituted 5-amino-3(2H)-furanones in 55%-quantitative yields.
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