A new multicomponent synthesis of 2-aminothiophene carbocyclic acids 4 by reaction of methyl 2-siloxycyclopropane-carboxylates 1, alkyl cyanoacetates, and elemental sulfur is reported. This version of the Gewald thiophene synthesis rapidly provides a new type of δ-amino acids, which can be considered as dipeptide analogues. Smooth protective-group manipulations allowed regio- and chemoselective couplings with l-phenylalanine derivatives furnishing new tripeptide analogues such as 5 and 8 or products of type 10.
New Macrocyclic Peptidomimetics Containing 5-Aminothiophene Subunits
作者:Hülya Özbek、Dieter Lentz、Hans-Ulrich Reissig
DOI:10.1002/ejoc.201001066
日期:2010.11
The synthesis of a new class of cyclic peptidomimeticscontaining5-aminothiophenesubunits in their backbone is presented. A modified Gewald reaction was applied as a key step in the synthesis of the thiophene amino acid that was used as a building block in the synthesis of linear oligomers by using standard peptide coupling protocols. Macrocyclization was achieved under high dilution by using EDCI
介绍了在其骨架中含有 5-氨基噻吩亚基的一类新环状肽模拟物的合成。改进的 Gewald 反应被用作合成噻吩氨基酸的关键步骤,噻吩氨基酸在使用标准肽偶联方案合成线性寡聚体时用作结构单元。通过使用 EDCI 作为偶联剂在高度稀释下实现大环化。无环二聚体和环状四聚体的构象通过 X 射线晶体学分析确定。