An efficient solid-phase synthesis of Fmoc (glyco)peptide thioesters is described. Fmoc·Ser·OAll and Fmoc·Thr·OAll bound to resin with a silyl ether linker were deallylated by Pd(0) catalysis and condensed with thiophenol, benzyl mercaptane, and ethyl 3-mercaptopropionate by activation with DCC/HOBt. The thioesters were released from the resin either by treatment with CsF-AcOH or by acidic hydrolysis. The effectiveness of this silyl linker strategy is further demonstrated by the synthesis of more complex (glyco)peptide thioesters 25, 26 and 27 involving N→C and C→N peptide elongation.
本文介绍了一种高效的 Fmoc(糖)肽
硫代酯固相合成方法。在
钯(0)催化下,Fmoc-Ser-OAll 和 Fmoc-Thr-OAll 与带有
硅醚连接物的
树脂结合,并与
噻吩酚、
硫醇苄酯和
3-巯基丙酸乙酯通过
DCC/
HOBt 活化缩合。
硫代酯可通过 CsF-AcOH 处理或酸性
水解从
树脂中释放出来。通过合成涉及 N→C 和 C→N 肽延伸的更复杂的(糖)肽
硫代酯 25、26 和 27,进一步证明了这种
硅烷链接策略的有效性。