Triblock Peptide and Peptide Thioester Synthesis With Reactivity-Differentiated Sulfonamides and Peptidyl Thioacids
作者:David Crich、Indrajeet Sharma
DOI:10.1002/anie.200903050
日期:2009.9.28
One after the other: Triblock peptide synthesis was achieved at ambient temperature by sequential reaction of sulfonamide‐protected peptidyl thioacids first with highly reactive 2,4‐dinitrobenzenesulfonamides and second with more moderately reactive sulfonamides to produce the oligopeptides in good yields. The method is compatible with C‐terminal thioesters and thus presents a new approach for native
一个接一个:三嵌段肽的合成是在环境温度下通过磺酰胺保护的肽基硫酸首先与高反应性的 2,4-二硝基苯磺酰胺,然后与反应性中等的磺酰胺顺序反应来实现的,从而以良好的收率生产寡肽。该方法与 C 端硫酯兼容,因此为天然化学连接策略提供了一种新方法。
Aziridine-Mediated Ligation and Site-Specific Modification of Unprotected Peptides
ligation site. The aziridine-mediated peptide ligation concept is exemplified using H(2)O as the nucleophile, producing a Xaa-Thr linkage (where Xaa can be an epimerizable and hindered aminoacid). The overall process is compatible with a variety of unprotectedaminoacid functionality, most notably the N-terminal and Lys side chain amines.
Improved methods of native chemical ligation are provided. The methods involve reacting a thioacid (e.g. a peptide thioacid) with an aziridinyl compound (e.g. an aziridinyl peptide) under mild conditions without the use of protecting groups, and without requiring that a cysteine residue be present in the ligation product. Initial coupling of the thioacid and the aziridinyl compound yields a ligation product which contains an aziridinyl ring. Subsequent opening of the aziridinyl ring (e.g. via a nucleophilic attack) produces a linearized and modified ligation product.
T3P (propylphosphonic anhydride) mediated conversion of Nα-protected amino/peptide acids into thioacids
作者:Chilakapati Madhu、Basavaprabhu、T.M. Vishwanatha、Vommina V. Sureshbabu
DOI:10.1016/j.tetlet.2012.01.027
日期:2012.3
protocol, which makes use of T3P as an acidactivator for the synthesis of Nα-protectedamino/peptide thioacids from corresponding acids in the presence of finely ground Na2S as hydrosulfide ion donor is described. The protocol employed significantly increases the overall efficiency as the yield, reaction duration and purity of even sterically hindered aminoacids.