Two cyclopentapeptides cyclo(ProTyrLeuAlaGly)(1) and cyclo(AlaTyrLeuAlaGly)(2) isolated and identified from a Chinese medicinal herb were chosen as model cyclopeptides to evaluate a novel coupling reagent DEPBT (3-(diethoxy-phosphoryloxy-1,2,3-benzotriazin-4(3H)-one). DEPBT was used for synthesis of cyclic peptides in one-pot procedure. Compared with some other coupling reagents, the cyclization yields were satisfactory.
                                    研究人员选择了从一种中草药中分离并鉴定出的两种环五肽环(ProTyrLeuAlaGly)(1)和环(AlaTyrLeuAlaGly)(2)作为模型环肽,以评估一种新型偶联试剂 
DEPBT(3-(二乙氧基
磷酰氧基-
1,2,3-苯并三嗪-4(3H)-酮)。
DEPBT 被用于以一锅程序合成环肽。与其他一些偶联试剂相比,环化产率令人满意。