作者:Attila Paczal、Attila C. Bényei、András Kotschy
DOI:10.1021/jo060594+
日期:2006.8.1
N-heterocyclic carbene precursors, containing an imidazoline or tetrahydropyrimidine framework, were prepared from ω-chloroalkanoyl chlorides. The sequential attachment of nitrogen nucleophiles and subsequent ring closure gave, depending on the reagents used, either the desired dihydroimidazolium and tetrahydropyrimidinium salts or their parent heterocycles. In this latter case, the second substituent was introduced
由ω-氯代烷酰氯制备了一系列含咪唑啉或四氢嘧啶骨架的N-杂环卡宾前体。取决于所使用的试剂,氮亲核试剂的顺序连接和随后的闭环给出所需的二氢咪唑鎓盐和四氢嘧啶鎓盐或其母体杂环。在后一种情况下,在烷基化步骤中引入第二取代基。以相当的效率实现了带有手性或庞大取代基的卡宾前体的制备。