作者:Giorgio Della Sala、Brunello Nardone、Francesco De Riccardis、Irene Izzo
DOI:10.1039/c2ob26764k
日期:——
Association constants, for small cationic alkali, and catalytic performances, in a model nucleophilic substitution, are comparable to those of representative crown ethers. Noteworthy, the N-[2-(2-methoxyethoxy)ethyl] side chain derivative presents a catalytic efficiency comparable to that of crypt-222, and higher than some commonly used quaternary ammonium salts and crown ethers. Moreover its association
报道了不同取代的环六肽在相转移(PT)条件下的合成,络合性质和催化活性。在模型亲核取代中,阳离子阳离子较小的缔合常数和催化性能可与代表性冠醚的相当。值得注意的是,N- [2-(2-甲氧基乙氧基)乙基]侧链衍生物的催化效率与crypt-222相当,并且比某些常用的季铵盐和冠醚更高。此外,其与Na +的缔合常数与二环己基-18-crown-6相比,络合度更高。合成的环六肽类化合物代表了这些肽模拟物在PT催化中的第一个实例,预计在双相PT方法学中将有有趣的应用。