Different sensitivities to competitive inhibition of benzodiazepine receptor binding of11C-iomazenil and11C-flumazenil in rhesus monkey brain
摘要:
The in vivo binding kinetics of C-11-iomazenil were compared with those of C-11-flumazenil binding in rhesus monkey brain. The monkey was anesthetized with ketamine and intravenously injected with either C-11-iomazenil or C-11-flumazenil in combination with the coadministration of different doses of non-radioactive flumazenil (0, 5 and 20 mug/kg). The regional distribution of C-11-iomazenil in the brain was similar to that of C-11-flumazenil. but the sensitivity of C-11-iomazenil binding to competitive inhibition by non-radioactive flumazenil was much less than that of C-11-flumazenil binding. A significant reduction in C-11-flumazenil binding in the cerebral cortex was observed with 20 mug/kg of flumazenil, whereas a relatively smaller inhibition of C-11-iomazenil binding in the same region was observed with the same dose of flumazenil. These results suggest that C-11-flumazenil may be a superior radiotracer for estimating benzodiazepine receptor occupancy in the intact brain.
A safe and selective method for reduction of 2-nitrophenylacetic acid systems to N-aryl hydroxamic acids using continuous flow hydrogenation
作者:Ogar Ichire、Petra Jans、Galina Parfenov、Amy B. Dounay
DOI:10.1016/j.tetlet.2017.01.008
日期:2017.2
The cyclichydroxamicacid functional group is critical to the biological activity of numerous natural products and drug candidates. Efficient, reliable, and green synthetic methods to produce cyclichydroxamicacids are needed. Herein, flow hydrogenation has been explored as a novel approach toward achieving the selective partial reduction of 2-nitrophenylacetic acid to 1-hydroxyindolin-2-one. The