The synthesis and evaluation of 10- and 12-membered ring benzofused enediyne amino acids
作者:Yanming Du、Christopher J. Creighton、Zhengyin Yan、Diane A. Gauthier、John P. Dahl、Boyu Zhao、Stanley M. Belkowski、Allen B. Reitz
DOI:10.1016/j.bmc.2005.07.016
日期:2005.11
The enediyne moiety is a versatile functional group found in natural anticancer and anti-infective agents, undergoing the Bergman cyclization reaction to afford a diradical which cleaves double-stranded DNA. We have incorporated the enediyne group into 10- (4-10) and 12-membered ring (11) cyclic amino acids and dipeptides, respectively, and explored their relative reactivity toward cyclization, varying
烯二炔部分是天然抗癌剂和抗感染剂中发现的通用官能团,其经过伯格曼环化反应以提供双自由基,该双自由基可裂解双链DNA。我们已将烯二炔基团分别掺入10-(4-10)和12-元环(11)环状氨基酸和二肽中,并探索了它们对环化的相对反应性,在10-元的情况下会改变N取代环状底物,当在有或没有微波辐射的条件下使用热条件时,都能以良好的收率得到预期的环化产物。N-甲苯磺酰基取代的衍生物(4)显示出形成双链超螺旋DNA的切口。与N-甲磺酰基或酰基取代基相比,环上的N-芳磺酰基取代基促进了环化作用,可能是由于pi-pi堆积效应,因为在固态和溶液状态下均证明了芳基与烯二炔的内在关系。12元环烯二炔二肽(11)在多种条件下对Bergman环化呈惰性。当用紫外线照射该基材时,观察到区域和立体特异性还原,其中炔烃之一被还原为Z-烯烃(47)。