Synthesis of Ring-Fused Oxazolo- and Pyrazoloisoquinolinones by a One-Pot Pd-Catalyzed Carboxamidation and Aldol-Type Condensation Cascade Process
作者:Gagan Chouhan、Howard Alper
DOI:10.1021/jo9010574
日期:2009.8.21
three-component cascade process is described for the synthesis of ring-fused oxazolo- and pyrazoloisoquinolinones by a one-pot carboxamidation/aldol-type condensation reaction. The cascade process involves Pd-catalyzed carboxamidation of an aryl halide/active methylene compound with oxazolidinone or pyrazolidinone, and subsequent intramolecular base-catalyzed cyclization/dehydration through an aldol-type
描述了通过单锅羧酰胺化/醛醇缩合反应合成环稠合的恶唑啉和吡唑异喹啉酮的三组分级联方法。级联过程涉及芳基卤化物/活性亚甲基化合物与恶唑烷酮或吡唑烷酮的钯催化羧酰胺化,以及随后的分子内碱催化的醛醇缩合环化/脱水,以产生环稠合的恶唑啉代和吡唑并异喹啉酮。这种方法为这些重要的含氮杂环类化合物提供了一种简单的一步方法,并且可以耐受各种官能团,包括酯,腈,甲氧基和卤化物。