Dynamic combinatorial chemistry with hydrazones: libraries incorporating heterocyclic and steroidal motifs
作者:Mark G. Simpson、Michael Pittelkow、Stephen P. Watson、Jeremy K. M. Sanders
DOI:10.1039/b917146k
日期:——
We expand the possibilities in hydrazone based dynamic combinatorial chemistry with a series of new building blocks incorporating heterocyclic motifs. The synthetic procedure allows efficient access to building blocks with the general structure (MeO)2CH-Heterocycle-C(O)NHNH2, originating from heterocycles with an amine and an ester functionality. The equilibrium distribution of macrocyclic N-acyl hydrazones formed upon deprotection of the building blocks with TFA in organic solvents is reported. The mixing behaviour of these heterocycle-based building blocks with our cholate-based building blocks is described, particularly the observation of kinetic intermediates that disappear following ‘proof-reading’.
我们通过一系列引入杂环基序的新型构建单元,拓展了基于脒的动态组合化学的可能性。合成程序可以高效地获得具有通用结构 (MeO)2CH-杂环-C(O)NHNH2 的构建单元,这些构建单元源自含有胺和酯官能团的杂环化合物。我们还报道了在有机溶剂中用三氟乙酸对这些构建单元进行去保护后形成的宏环 N-酰基脒的平衡分布情况。此外,描述了这些基于杂环的构建单元与我们基于胆酸盐的构建单元的混合行为,特别是观察到在“校对”后消失的动力学中间体。