作者:Sungjoon Huh、Solomon D. Appavoo、Andrei K. Yudin
DOI:10.1021/acs.orglett.0c03369
日期:2020.12.4
The amidine functionality switches between hydrogen bond donor and acceptor roles depending on pH. Herein, the amidine was incorporated to select amides in cyclo(d-Ala-Pro-d-Phe-Pro-Gly). The unprotonated amidine-containing macrocyclic conformation resembles its oxoamide counterpart. Upon protonation, minimal alterations in the macrocyclic conformation were observed despite changes to the hydrogen
脒官能团根据 pH 在氢键供体和受体角色之间切换。在本文中,脒被掺入以选择环(d -Ala -Pro- d -Phe-Pro-Gly)中的酰胺。未质子化的含脒大环构象类似于其氧代酰胺对应物。质子化后,尽管氢键网络发生了变化,但观察到大环构象的变化很小。脒以最小的空间成本破坏氢键,使其成为研究氢键对大环构象影响的有用功能。