作者:Ramon Subirós-Funosas、Ayman El-Faham、Fernando Albericio
DOI:10.1039/c003719b
日期:——
Recent studies described the great impact of a non-benzotriazolic family of coupling reagents based on ethyl 2-cyano-2-(hydroxyimino)acetate, Oxyma, as a powerful coupling methodology for peptide synthesis. Here we present the synthesis and evaluation of the derived phosphonium salts O-[(1-cyano-2-ethoxy-2-oxoethylidene)amino]-oxytri(pyrrolidin-1-yl) phosphonium hexafluorophosphate (PyOxP) and tetrafluoroborate (PyOxB). Both coupling reagents exhibited higher capacity to suppress racemization in various peptide models and enhanced solubility in DMF and DCM than benzotriazole-based reagents. In addition, the hexafluorophosphate analog PyOxP, combined excellent stability with outstanding efficiency in the assembly of demanding penta and decapeptides that include consecutive Aib residues. Cyclization models revealed the advantages of PyOxP, which rendered a higher percentage of cyclic material than other known potent phosphonium salts.
最近的研究表明,基于 2-氰基-2-(羟基亚氨基)乙酸乙酯的非苯并三氮唑偶联试剂 Oxyma 系列作为一种强大的偶联方法对多肽合成具有重大影响。在此,我们介绍了衍生鏻盐 O-[(1-氰基-2-乙氧基-2-氧代亚乙基)氨基]-氧三(吡咯烷-1-基)鏻六氟磷酸盐(PyOxP)和四氟硼酸盐(PyOxB)的合成和评估。与苯并三唑类试剂相比,这两种偶联试剂在各种肽模型中抑制消旋化的能力更强,在 DMF 和 DCM 中的溶解度也更高。此外,六氟磷酸类似物 PyOxP 在组装包含连续 Aib 残基的高要求五肽和十肽时,兼具出色的稳定性和卓越的效率。环化模型显示了 PyOxP 的优势,与其他已知的强效鏻盐相比,PyOxP 生成的环状物质比例更高。