Synthetic ansamycins prepared by a ring-expanding Claisen rearrangement. Synthesis and biological evaluation of ring and conformational analogues of the Hsp90 molecular chaperone inhibitor geldanamycin
作者:Christopher S. P. McErlean、Nicolas Proisy、Christopher J. Davis、Nicola A. Boland、Swee Y. Sharp、Kathy Boxall、Alexandra M. Z. Slawin、Paul Workman、Christopher J. Moody
DOI:10.1039/b615378j
日期:——
A series of ansa-quinones has been prepared by chemical synthesis, and evaluated by biological techniques. Thus, 19-membered ansa-lactams, simplified analogues of the naturally occurring Hsp90 molecular chaperone inhibitorgeldanamycin, were obtained by concise routes, the key steps being the combination of a ring-closing metathesis to give a 17-membered ring followed by Claisen rearrangement to effect ring expansion. The methodology was also used to prepare an “unnatural” 18-membered ring analogue. In ATPase enzyme assays, the synthetic ansa-quinones were weak inhibitors of Hsp90.
通过化学合成制备了一系列ansa-醌,并利用生物技术进行了评估。因此,通过简明的途径获得了19元ansa-内酰胺,这些内酰胺是天然存在的Hsp90分子伴侣抑制剂格尔德霉素的简化类似物,关键步骤是通过环闭合的杂化反应生成17元环,然后通过克莱森重排实现环扩张。该方法也被用于制备一种“非天然”的18元环类似物。在ATP酶酶活力测定中,合成的ansa-醌对Hsp90表现出较弱的抑制作用。