A catalytic one-step synthesis of peptide thioacids was developed. The oxygen–sulfur atom exchange reaction converted the carboxy group at the C-terminus of the peptides into a thiocarboxy group with suppressed epimerization. This method was successfully applied to the synthesis of the peptide drug leuprorelin via an iterative fragment-coupling protocol.
Experimental antileukemic agents. Preparation and structure-activity study of S-tritylcysteine and related compounds
作者:Kwang-Yuen Zee-Cheng、Chia-Chung Cheng
DOI:10.1021/jm00297a019
日期:1970.5
Structure–Activity Relationship of <i>S</i>-Trityl-<scp>l</scp>-Cysteine Analogues as Inhibitors of the Human Mitotic Kinesin Eg5
作者:Salvatore DeBonis、Dimitrios A. Skoufias、Rose-Laure Indorato、François Liger、Bernard Marquet、Christian Laggner、Benoît Joseph、Frank Kozielski
DOI:10.1021/jm070606z
日期:2008.3.13
The human kinesin Eg5 is a potential drug target for cancer chemotherapy. Eg5 specific inhibitors cause cells to block in mitosis with a characteristic monoastral spindle phenotype. Prolonged metaphase block eventually leads to apoptotic cell death. S-trityl-L-cysteine (STLC) is a tight-binding inhibitor of Eg5 that prevents mitotic progression. It has proven antitumor activity as shown in the NCI 60 tumor cell line screen. It is of considerable interest to define the minimum chemical structure that is essential for Eg5 inhibition and to develop more potent STLC analogues. An initial structure-activity relationship study on a series of STLC analogues reveals the minimal skeleton necessary for Eg5 inhibition as well as indications of how to obtain more potent analogues. The most effective compounds investigated with substitutions at the paraposition of one phenyl ring have an estimated K-i(app) of 100 nM in vitro and induce mitotic arrest with an EC50 of 200 nM.
Barlos, Kleomenis; Mamos, Petros; Papaioannou, Dionysios, Liebigs Annalen der Chemie, 1987, p. 1025 - 1030