Total Synthesis Confirms Laetirobin as a Formal Diels-Alder Adduct
作者:Oliver Simon、Bastien Reux、James J. La Clair、Martin J. Lear
DOI:10.1002/asia.200900306
日期:2010.2.1
practical copper(I)‐mediated formation of a bis(benzo[b]furan), and 3) the biomimetic [4+2] dimerization and unexpected cationic [5+2] annulation of gem‐diaryl alkene precursors. Preliminary structure–activity relationship data between the isomeric [4+2] and [5+2] tetramers revealed only the natural product to possess promising anticancer potential. Specifically, laetirobin is capable of blocking tumor
从寄生真菌宿主与植物的关系中分离出的来替罗宾是通过六个实际步骤合成的,从市售的2,4-二羟基苯乙酮中总收率为12%。因为产物是苯并[ b ]呋喃的假对称四聚体,所以合成的每个步骤都设计为涉及串联操作。重点包括:1)双炔烃的双重Sonogashira反应; 2)实际由铜(I)介导的双(苯并[ b ]呋喃)的形成; 3)仿生[4 + 2]二聚化和宝石发生意外的阳离子[5 + 2]圆环化-二芳基烯烃前体。异构体[4 + 2]和[5 + 2]四聚体之间的初步结构-活性关系数据显示,只有天然产物才具有有前途的抗癌潜力。具体而言,来替罗宾能够阻断肿瘤细胞分裂(有丝分裂)并引起程序性细胞死亡(凋亡)。