Design and Stereoselective Synthesis of ProM-2: A Spirocyclic Diproline Mimetic with Polyproline Type II (PPII) Helix Conformation
作者:Cédric Reuter、Robert Opitz、Arne Soicke、Stephan Dohmen、Matthias Barone、Slim Chiha、Marco Tobias Klein、Jörg-Martin Neudörfl、Ronald Kühne、Hans-Günther Schmalz
DOI:10.1002/chem.201406493
日期:2015.6.1
of developing polyproline type II helix (PPII) secondary‐structure mimetics for the modulation of prolin‐rich‐mediated protein–protein interactions, the novel diproline mimetic ProM‐2 was designed by bridging the two pyrrolidine rings of a diproline (Pro–Pro) unit through a Z‐vinylidene moiety. This scaffold, which closely resembles a section of a PPII helix, was then stereoselectively synthesized by
为了开发用于调节富含脯氨酸的介导的蛋白质-蛋白质相互作用的聚脯氨酸II型螺旋(PPII)二级结构模拟物,通过桥接双脯氨酸的两个吡咯烷环(Pro –Pro)单元通过Z-亚乙烯基部分。然后,通过使用钌催化的闭环复分解(RCM)作为关键步骤,立体选择性地合成了这个与PPII螺旋的一部分非常相似的支架。所需vinylproline构建块,即,(- [R )- ñ -Boc-2- vinylproline(BOC =叔丁氧基羰)和(S,S)-5- vinylproline-叔克丁酸酯以纯立体异构体的克级制备。通过使用2-(1 H --7-氮杂苯并三唑-1-基)-1,1,3,3-四甲基铀六氟磷酸盐(HATU)/ N,可以实现高收率且没有差向异构的难以实现立体构图的肽偶联,ñ二异丙基乙胺(DIPEA)。在Grubbs II催化剂的存在下,RCM顺利进行。X射线晶体学确定了几种中间体的立体结构分配。作