烯烃复分解已成为调节生物相关化合物的稳定性和活性的有前途的策略;然而,控制产品中烯烃几何形状的能力仍然是一个挑战。环金属化钌催化剂设计的最新进展催生了实现这种高保真度和Z选择性控制的新策略,但这些催化剂在具有多种功能(包括肽)的基质上的范围和局限性仍有待探索。在此,我们报告了对肽的生产性和非生产性 Z 选择性复分解的各种因素的评估。通过同二聚化、交叉复分解和闭环复分解探索了空间、侧链同一性和通过肽二级结构的预组织的影响。我们的结果表明,氨基酸侧链和烯烃的特性深刻影响环金属化钌催化剂在Z-选择性复分解中的活性。不同肽底物上的交叉复分解和闭环复分解强调了实现高转化率和 Z 选择性的标准。本报告中概述的原理不仅对于扩大 Z-选择性烯烃复分解到肽的范围很重要,而且对于在一般合成工作中应用立体选择性烯烃复分解也很重要。
Self-Selection in Olefin Cross-Metathesis: The Effect of Remote Functionality
摘要:
[GRAPHICS]Olefin cross-metathesis (CM) is potentially an attractive method for generating dynamic combinatorial libraries (DCLs). In order for the CM reaction to be useful for DCL production, the course of the reaction and product distribution must be relatively insensitive to functionality remote from the reacting centers. We report on the CM of a series of allyl- and homoallylamides that are strongly dependent on remote functionality. This includes an unusual example of a cis-selective CM.
A microwave enhanced cross-metathesis approach to peptidomimetics
作者:Thomas Morris、David Sandham、Stephen Caddick
DOI:10.1039/b700804j
日期:——
Functionalization of aminoacid C- and N-termini with appropriate olefinic moieties allows for the generation of a peptidomimetic via a stereoselective cross-metathesis.
The invention relates generally to the synthesis of modified amino acids and modified peptides in the presence of cyclometalated catalysts. The invention has utility in the fields of catalysis, organic synthesis, polymer chemistry, and industrial and fine chemicals chemistry.