描述了使用分子碘的不含过渡金属的 C=C 双键断裂反应。在作为碱基的 K 2 CO 3存在下,I 2介导的 C=C 键断裂,随后N -(2-乙烯基芳基)吡啶-2-胺底物的分子内环化产生吡啶并[2,1- b ]喹唑啉酮和相关杂环化合物。该反应可以在克级上完成,并已成功应用于合成具有重要生物学特性的化合物,包括外排泵抑制和抗过敏活性。
Serendipitous Synthesis of Pyridoquinazolinones <i>via</i> an Oxidative C–C Bond Cleavage
作者:Matthias Brendel、Priyanka R. Sakhare、Gaurav Dahiya、Parthasarathi Subramanian、Krishna P. Kaliappan
DOI:10.1021/acs.joc.0c00982
日期:2020.6.19
A direct one-pot copper-catalyzed oxidative C–C bond cleavage route to the synthesis of pyridoquinazolinones is described. This one-pot strategy involves a copper-catalyzed C–N coupling followed by concomitant C(sp3)–H oxidation and amidation via oxidative C–C bond cleavage under an O2 atmosphere to deliver the target molecules in high yields.
AbstractAn efficient copper‐catalyzed tandem aerobic oxidative annulation and carbon‐carbon bond cleavage reaction was developed from easily accessible arylacetamides, which provides a direct approach for the domino synthesis of a vast array of tricyclic or tetracyclic fused quinazolinone alkaloid structures. A plausible reaction mechanism is proposed involving an aerobic benzylic oxidation/cyclization/decarbonylation cascade.magnified image