Lanthanide(III)-Catalyzed Synthesis of <i>trans</i>-Diaminocyclopentenones from Substituted Furfurals and Secondary Amines via a Domino Ring-Opening/4π-Electrocyclization Pathway
作者:Afton Hiscox、Kauan Ribeiro、Robert A. Batey
DOI:10.1021/acs.orglett.8b02711
日期:2018.11.2
A strategy toward the synthesis of trans-4,5-diaminocyclopent-2-enones is described. This core motif is embedded in the marine sponge derived alkaloids agelamadin B and nagelamide J. A variety of 2-substituted trans-4,5-diaminocyclopent-2-enones were synthesized in good to quantitative yields using lanthanide(III) catalysis. The products were formed exclusively as the trans-diastereomers via a mechanism
描述了合成反式-4,5-二氨基环戊-2-烯酮的策略。该核心基序嵌入海洋海绵衍生的生物碱agelamadin B和nagelamide J中。使用镧系元素(III)催化以良好的定量收率合成了各种2-取代的反式-4,5-二氨基环戊-2-烯酮。产物是通过一种机制通过反式-非对映异构体而专门形成的,在该机制中,C4–C5键的形成是通过4π-旋转电环化形成的。使用3-溴糠醛与硼酸,三氟硼酸盐或炔烃之间的钯(0)催化交叉偶联,可以轻松获得前体3-取代的糠醛。