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。