One-step synthesis of N-acetylcysteine and glutathione derivatives using the Ugi reaction
作者:Alexander G. Zhdanko、Anton V. Gulevich、Valentine G. Nenajdenko
DOI:10.1016/j.tet.2009.04.030
日期:2009.6
Cys–Gly, glutathione, and homoglutathione derivatives were synthesized by the Ugi four-component reaction using various benzylthio aldehydes and ketones as carbonyl building blocks. The scope and limitations of the method were investigated. Formation of imidazoline by-products in the Ugi reaction was discussed. 2,2,2-Trifluoroethanol was shown to be a superior reaction media than methanol in some reactions
通过Ugi四组分反应,使用各种苄硫基醛和酮作为羰基结构单元,可以合成得到完全保护的天然和非天然N-乙酰半胱氨酸,二肽Cys-Gly,谷胱甘肽和高谷胱甘肽衍生物。研究了该方法的范围和局限性。讨论了在Ugi反应中咪唑啉副产物的形成。在某些反应中,显示2,2,2-三氟乙醇是一种比甲醇更好的反应介质。同样,当异氰基乙酸的更高反应性时,异氰基乙酸的4-甲基-2,6,7-三氧杂双环[2.2.2]辛基衍生物(OBO-酯)被证明比异氰基乙酸乙酯更适合用作肽合成前体。需要异氰酸酯。