A convenient synthesis of difficult medium-sized cyclic peptides by Staudinger mediated ring-closure
作者:Khanh Ha、Jean-Christophe M. Monbaliu、Byron C. Williams、Girinath G. Pillai、Charles E. Ocampo、Matthias Zeller、Christian V. Stevens、Alan R. Katritzky
DOI:10.1039/c2ob25996f
日期:——
Novel, efficient and mild preparation of 7- and 8-membered cyclic di- and 10-membered cyclic tripeptides containing α-, β- or γ-amino acid residues is effected by a Staudinger-mediated ring closure. Medium-sized cyclic di- and tripeptides – recognized as difficult targets – were obtained in moderate to good yields according to a straightforward sequence. Empirical force-field calculations were undertaken
Staudinger介导的闭环可以有效,温和地制备含有α-,β-或γ-氨基酸残基的7元和8元环状二元和10元环状三肽。中型环状二肽和三肽(被认为是困难的靶标)是根据简单的顺序以中等到良好的产率获得的。进行了经验力场计算,以确定它们的构象行为,并显示出与X射线结果高度相似的水平。在B3LYP / 6-31 + G **理论水平的计算研究提供了有关叠氮基肽硫酯环化的序列,环大小和取代对活化障碍的影响的信息。