Synthesis and Evaluation of Novel Activated Mixed Carbonate Reagents for the Introduction of the 2-(Trimethylsilyl)ethoxycarbonyl(Teoc)-Protecting Group
作者:Richard E. Shute、Daniel H. Rich
DOI:10.1055/s-1987-27939
日期:——
The synthesis of 1-[2-(trimethylsilyl)ethoxycarbonyloxy]benzotriazole (Teoc-OBt) and 1-[2-(trimethylsilyl)ethoxycarbonyloxy]pyrrolidin-2,5-dione (Teoc-OSu) in high yields is reported. Both compounds are crystalline compounds that react with amino acids under Schotten-Baumann conditions to produce Teoc-amino acids in high yields. The synthesis of nine new Teoc-amino acid derivatives is reported. Analysis of the products obtained during the synthesis of Teoc-Phe before and after crystallization as the cyclohexylamine salt revealed that ~ 5% of the corresponding dipeptide, Teoc-Phe-Phe-OH was produced when Teoc-OBt was used as the acylating reagent. In contrast, no dipeptide was detected when Teoc-OSu was utilized as the acylating reagent for the synthesis of the Teoc-amino acid derivatives studied. The use of Teoc-OSu should facilitate the use of the Teoc-group in peptide synthesis.
报告了1-[2-(三甲基硅烷基)乙氧羰氧基]苯并三氮唑(Teoc-OBt)和1-[2-(三甲基硅烷基)乙氧羰氧基]吡咯烷-2,5-二酮(Teoc-OSu)的高产率合成。这两种化合物均为晶体化合物,在Schotten-Baumann条件下与氨基酸反应,可高产率地生成Teoc-氨基酸。报告了九种新的Teoc-氨基酸衍生物的合成。在合成Teoc-苯丙氨酸过程中,分析了结晶为环己胺盐前后的产物,结果显示,当使用Teoc-OBt作为酰化试剂时,产生了约5%的相应二肽,即Teoc-苯丙氨酸-苯丙氨酸-OH。相比之下,当使用Teoc-OSu作为酰化试剂合成所研究的Teoc-氨基酸衍生物时,未检测到二肽。使用Teoc-OSu将有助于Teoc基团在肽合成中的应用。