Synthesis of the bis-potassium salts of 5-hydroxy-3-oxopent-4-enoic acids and their use for the efficient preparation of 4-hydroxy-2H-pyran-2-ones and other heterocycles
作者:Dietmar Schmidt、J?rgen Conrad、Iris Klaiber、Uwe Beifuss
DOI:10.1039/b611105j
日期:——
5-Hydroxy-3-oxopent-4-enoic acid esters can be efficiently transformed into the stable bis-potassium salts of the corresponding 5-hydroxy-3-oxopent-4-enoic acids, from which the sensitive acids are released in situ, the latter being converted into substituted 4-hydroxy-2H-pyran-2-ones, pyrazoles and isoxazoles under mild conditions; the efficiency of this method is demonstrated by the first synthesis
可以将5-羟基-3-oxopent-4-enoic酸酯有效地转化为相应的5-hydroxy-3-oxopent-4-enoic酸的稳定双钾盐,敏感酸从该盐中就地释放出来,后者在温和条件下转化为取代的4-羟基-2H-吡喃-2-酮,吡唑和异恶唑;该方法的效率通过两种天然存在的吡喃酮的首次合成得到证明。