Synthesis and structure–activity relationships of benzophenone-bearing diketopiperazine-type anti-microtubule agents
摘要:
KPU-105 (4), a potent anti-microtubule agent that contains a benzophenone was derived from the dike-topiperazine-type vascular disrupting agent (VDA) plinabulin 3, which displays colchicine-like tubulin depolymerization activity. To develop derivatives with more potent anti-microtubule and cytotoxic activities, we further modified the benzophenone moiety of 4. Accordingly, we obtained a 4-fluorobenzophenone derivative 16j that inhibited tumor cell growth in vitro with a subnanomolar IC50 value against HT-29 cells (IC50 = 0.5 nM). Next, the effect of 16j on mitotic spindles was evaluated in HeLa cells. Treatment with 3 nM of 16j partially disrupted the interphase microtubule network. By contrast, treatment with the same concentration of CA-4 barely affected the microtubule network, indicating that 16j exhibited more potent anti-mitotic effects than did CA-4. (C) 2012 Elsevier Ltd. All rights reserved.
Synthesis and structure–activity relationships of benzophenone-bearing diketopiperazine-type anti-microtubule agents
摘要:
KPU-105 (4), a potent anti-microtubule agent that contains a benzophenone was derived from the dike-topiperazine-type vascular disrupting agent (VDA) plinabulin 3, which displays colchicine-like tubulin depolymerization activity. To develop derivatives with more potent anti-microtubule and cytotoxic activities, we further modified the benzophenone moiety of 4. Accordingly, we obtained a 4-fluorobenzophenone derivative 16j that inhibited tumor cell growth in vitro with a subnanomolar IC50 value against HT-29 cells (IC50 = 0.5 nM). Next, the effect of 16j on mitotic spindles was evaluated in HeLa cells. Treatment with 3 nM of 16j partially disrupted the interphase microtubule network. By contrast, treatment with the same concentration of CA-4 barely affected the microtubule network, indicating that 16j exhibited more potent anti-mitotic effects than did CA-4. (C) 2012 Elsevier Ltd. All rights reserved.
Synthesis of biaryl ketones by arylation of Weinreb amides with functionalized Grignard reagents under thermodynamic control <i>vs.</i> kinetic control of <i>N</i>,<i>N</i>-Boc<sub>2</sub>-amides
作者:Guangchen Li、Michal Szostak
DOI:10.1039/d0ob00813c
日期:——
A highlyefficient method for chemoselective synthesis of biaryl ketones by arylation of Weinreb amides (N-methoxy-N-methylamides) with functionalized Grignard reagents is reported. This protocol offers rapid entry to functionalized biaryl ketones after Mg/halide exchange with i-PrMgCl·LiCl under operationally-simple and practical reaction conditions. The scope of the method is highlighted in >40 examples