Discovery of structurally simplified analogs of colchicine as an immunosuppressant
摘要:
We have discovered a new class of colchicine-derived therapeutic agents for immune diseases including rejection of organ-transplantation and autoimmune disease. Compound 2, which had been developed to overcome poor pharmacokinetic properties of compound 1, a first-generation colchicine analog, turned out to show toxicity such as intestinal toxicity and loss of weight during in vivo tests. The deletion of 7-carboxamide group and middle ring-truncation in colchicine allowed us to have structurally simplified analogs with strong immunosuppressive activity. Herein, we report non-alkaloid tricyclic compound 7 and 12 as immunosuppressants which exhibited a strong immunosuppressive in vivo efficacy on the T-dependent antibody response, the Zymosan A-induced arthritis model and the Carrageenan-induced edema model. Compound 7 and 12 revealed less toxicity than the previous lead compound 2, and their minimum lethal doses (MLD) were proved to exceed 100 mg/kg. (C) 2014 Elsevier Ltd. All rights reserved.
Several tropolone derivatives (4-7) were designed as novel retinoids on the assumption that the tropolonering may mimic the benzoic acid moiety in retinoid structures, such as Am80 (2). Among the synthesized compounds, 5-[2-(5,6,7,8-tetrahydro-5,5,8,8-tetramethyl-2-naphthyl)ethynyl]tropolone (7a) showed moderate potency as a differentiation-inducer of HL-60 cells. The activities of the tropolones were
Acid- and base-induced conformational alterations of N-aryl-N-troponyl amides
作者:Ai Ito、Masanori Sato、Ryu Yamasaki、Iwao Okamoto
DOI:10.1016/j.tetlet.2015.12.048
日期:2016.1
We have investigated acid- and base-induced conformational alterations of N-aryl-N-troponyl amides containing an electron-donating group on the phenyl ring. NMR spectral studies indicated that the E/Z conformational preferences of these amides can be reversibly controlled by pH-dependent protonation or deprotonation of the tropolone moiety. Thus, these compounds have potential applications as acid/base-controllable
A tropolonegroup has been employed for the first time as an anchoringgroup for dye‐sensitized solarcells (DSSCs). The DSSC based on a porphyrin, YD2‐o‐C8T, with a tropolone moiety exhibited a power‐conversion efficiency of 7.7 %, which is only slightly lower than that observed for a reference porphyrin, YD2‐o‐C8, with a conventional carboxylic group. More importantly, YD2‐o‐C8T was found to be superior