A Facile and Practical One-Pot Synthesis of β-Oxo Thioamides from β-Oxo Amides and Isothiocyanates
作者:Yongjiu Liang、Dewen Dong、Peng Huang、Dexuan Xiang、Yang Zhou、Tianhai Na
DOI:10.1055/s-0028-1088078
日期:2009.6
A facile and practical one-pot synthesis of β-oxo thioamidesfrom β-oxo amides has been developed. By treatment with isothiocyanates in ethanol in the presence of potassium carbonate, a series of β-oxo amides was converted, under reflux, in high yields into the corresponding β-oxo thioamides. thioamides - 3-oxo amides - isothiocyanates - ethanol - potassium carbonate
containing a thiomalonamide moiety was developed. Isothiocyanate derivatives of amino acids react smoothly with 2,2‐dimethyl‐1,3‐dioxane‐4,6‐dione (Meldrum'sacid) to yield new thiocarbamoyl derivatives of Meldrum'sacids. Thermal decomposition of these new derivatives leads to thiocarbamoyl ketenes, which acylate amino acid esters to give pseudo‐tripeptides.