Preparation, Isolation, and Characterization of <i>N</i><sup>α</sup>-Fmoc-peptide Isocyanates: Solution Synthesis of Oligo-α-peptidyl Ureas
作者:Vommina V. Sureshbabu、Basanagoud S. Patil、Rao Venkataramanarao
DOI:10.1021/jo0611723
日期:2006.9.1
Nα-Fmoc-tripeptidyl urea ester and acids containing one each of peptide bond and urea bond. The divergent approach is extended to the synthesis of tetrapeptidyl ureas by the 2 + 2 strategy using bis-TMS−peptide acid as an amino component. To incorporate urea bonds in adjacent positions, Nα-Fmoc-peptidyl urea isocyanates 9a−d were prepared and employed in the synthesis of three tetrapeptidyl ureas 10a−b and 11
所述Ñ α -Fmoc-肽的异氰酸酯3A - q,4A - Ç,和图5a - ç通过的Curtius重排制备Ñ α -Fmoc-肽酰基叠氮于甲苯下热,微波,和超声波的条件。所有Ñ α -Fmoc-低聚肽的异氰酸酯制成,分离稳定的结晶固体用71至94%的产率,并通过被完全表征1 H NMR,13 C NMR和质谱。其为寡-α肽脲的合成效用7A - ˚F和图8a -c通过发散耦合法得到证明。的耦合Ñ α -Fmoc-二肽的异氰酸酯与氨基酸酯或具有N,O二(三甲基硅基)氨基酸导致Ñ α -Fmoc-三肽基脲酯和含有各一个肽键和脲键的羧酸。发散的方法扩展到使用双-TMS-肽酸作为氨基成分的2 + 2策略合成四肽基脲。为了将脲键在相邻的位置,Ñ α -Fmoc肽尿素异氰酸9A - d被制备并在三个四肽脲的合成10a的- b和从N-末端开始连续包含一个肽键和两个脲键的11。然后该协议用于五个尿素的类似物的合成13