methodology for the synthesis of pharmaceutically interesting 3-unsubstituted-2,4-oxazolidinediones from α-hydroxyesters is described. A primary carbamate was generated in situ from the corresponding α-hydroxyester and trichloroacetyl isocyanate, then converted to the desired 3-unsubstituted 2,4-oxazolidinedione via intramolecular ring closure. This method is amenable to scale-up and requires no chromatographic
描述了一种方便,高产率的一锅法,用于从α-羟基酯合成可药用的3-un取代的
2,4-恶唑烷二酮。由相应的α-羟基酯和三
氯乙酰基
异氰酸酯原位生成伯
氨基甲酸酯,然后通过分子内闭环将其转化为所需的3-未取代的
2,4-恶唑烷二酮。该方法适合扩大规模,无需色谱纯化。