Towards the synthesis of [15]-membered stevastelins through the 2,3-epoxy analogues
作者:Francisco Sarabia、Samy Chammaa、Antonio Sánchez Ruiz、F.Jorge López-Herrera
DOI:10.1016/j.tetlet.2003.08.013
日期:2003.10
3-epoxy derivative 6. The synthesis of this compound was achieved via a stereoselective epoxidation of the allylic alcohol 13, followed by a coupling reaction with a variety of peptide derivatives to give the epoxy peptides 7–10. After an extensive study of cyclizations with these precursors, the best result was achieved with the macrolactamization of 8 in the presence of DEPC, to obtain the epoxy cyclic
一种合成的方法[15]成员stevastelins,一类新型的免疫抑制剂,据报道是基于向2,3-环氧衍生物6的大内酰胺化途径。该化合物的合成通过烯丙基醇的立体选择性环氧化达到13,随后通过与各种肽衍生物的偶联反应,得到环氧肽7 - 10。在对这些前体的环化进行了深入研究之后,在DEPC存在的情况下,通过8的内酰胺化获得了最佳结果,从而以42%的收率获得了环氧环二肽6。从该产品中,合成了一种Stevastelin B的环氧类似物,化合物27,准备好了。最后,尝试通过打开6和26中所含的环氧乙烷环,用各种甲基铜酸盐试剂来合成天然产物,但没有成功。