A Practical Large-Scale Synthesis of Cyclic RGD Pentapeptides Suitable for Further Functionalization through ‘Click' Chemistry
作者:Andreas Kirschning、Jiří Paleček、Gerald Dräger
DOI:10.1055/s-0030-1258396
日期:2011.2
A multigram batch of the cyclo[Arg-Gly-Asp-d-Phe-Lys] and its N-ε-azido derivative was accomplished via solution-phase synthesis using an epimerization-free fragment condensation. The C-terminus of d-Phe was protected as its tert-butyl ester. Fmoc (Arg, Gly, Asp, d-Phe) and Boc (Lys) groups were used to protect all N-α-termini. The Ts and NO2 groups, respectively were chosen to protect the guanidine
阿多克一批的环[精氨酸-甘氨酸- Asp-的d -Phe赖氨酸]及其Ñ -ε叠氮基衍生物,使用无差向异构化,片段缩合经由溶液相合成来完成。d- Phe的C末端被保护为叔丁基酯。Fmoc(Arg,Gly,Asp,d -Phe)和Boc(Lys)基团用于保护所有N -α-末端。分别选择Ts和NO 2基团来保护胍基。大环化步骤(在d -Phe和l之间-Lys)在TBTU / HOBt或DPPA缩合条件下进行。最后,通过重氮转移反应将赖氨酸残基的ε-氨基选择性地转化为叠氮基。 RGD肽-溶液相合成-氨基酸-环化-重氮化合物