Davis–Beirut Reaction: Route to Thiazolo-, Thiazino-, and Thiazepino-2H-indazoles
摘要:
Methods for the construction of thiazolo-, thiazino-, and thiazepino-2H-indazoles from o-nitrobenzaldehydes or o-nitrobenzyl bromides and S-trityl-protected 1 degrees-aminothioalkanes are reported. The process consists of formation of the requisite N-(2-nitrobenzyl) (tritylthio)alkylamine, subsequent deprotection of the trityl moiety with TFA, and immediate treatment with aq. KOH in methanol under Davis-Beirut reaction conditions to deliver the target thiazolo-, thiazino-, or thiazepino-2H-indazole in good overall yield. Subsequent S-oxidation gives the corresponding sulfone.
The invention relates to a conjugate comprising (a) an amatoxin comprising (i) an amino acid 4 with a 6'-deoxy position; and (ii) an amino acid 8 with an S-deoxy position; (b) a target-binding moiety; and (c) optionally a linker linking said amatoxin and said target-binding moiety. The invention furthermore relates to a pharmaceutical composition comprising such conjugate.
Cyclicpeptides have been expected to be one of the modalities of intracellular protein–protein interaction (PPI) inhibitors, but they are generally known to have low cell membranepermeability. In this study, we focused on the conformation of cyclicpeptides in the cell membrane to determine the requirement for their cell membranepermeability through passive diffusion. Utilizing the requirement,
环肽被认为是细胞内蛋白质-蛋白质相互作用(PPI)抑制剂的一种形式,但众所周知,它们的细胞膜通透性较低。在本研究中,我们重点关注细胞膜中环肽的构象,以确定其通过被动扩散对细胞膜渗透性的要求。利用这一要求,我们通过计算化学寻找对MDMX具有高亲和力的结构,并获得了环肽19 ( P app = 0.80 × 10 –6 cm s –1 ,IC 50 = 0.07 μM)。
AMANITIN CONJUGATES
申请人:Heidelberg Pharma GmbH
公开号:EP3222292A1
公开(公告)日:2017-09-27
The invention relates to a conjugate comprising (a) an amatoxin comprising (i) an amino acid 4 with a 6'-deoxy position; and (ii) an amino acid 8 with an S-deoxy position; (b) a target-binding moiety; and (c) optionally a linker linking said amatoxin and said target-binding moiety. The invention furthermore relates to a pharmaceutical composition comprising such conjugate.
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.
Spiro[(dihydropyrazin-2,5-dione)-6,3′-(2′,3′-dihydrothieno[2,3-<i>b</i>]naphtho-4′,9′-dione)]-Based Cytotoxic Agents: Structure–Activity Relationship Studies on the Substituent at N4-Position of the Diketopiperazine Domain
Analogues of the previously reported potent cytotoxic spiro[(dihydropyrazine-2,5-dione)-6,3'-(2',3'-dihydrothieno[2,3-b]naphtho-4',9'-dione)] derivatives (3, 3') were prepared to explore new structural requirements at the diketopiperazine domain for the cytotoxic activity. The in vitro activity was evaluated against the MCF-7 human breast carcinoma and SW 620 human colon carcinoma cell lines. The 4-[(2-N,N-dimethyl)amino]ethyl (6i), and the 4-(2-pyrrolydin)ethyl (61) derivatives emerged as the most potent compounds of this series, with a cytotoxic activity comparable to that of doxorubicin. These compounds, in both racemic and pure enantiomeric forms, showed also a high efficacy in cell lines resistant to doxorubicin (MCF-7/Dx) and in cell lines that were highly resistant to treatment with doxorubicin, such as HEK-293 (kidney), M-14 (melanoma), and HeLa (cervical adenocarcinoma) human cell lines. In addition, the effects on growth and cell cycle progression in CaCo-2 cell fine (colon adenocarcinoma) and DNA-binding properties were investigated.