Importance of Phenolic Address Groups in Opioid Kappa Receptor Selective Antagonists
摘要:
In vitro characterization and comparison of JDTic, its dehydroxy analogue and nor-BNI, and its dehydroxy analogue demonstrates that the N-substituted 3,4-dimethyl-(3-hydroxyphenyl)-piperidine-derived antagonist, JDTic, relies more heavily on its phenol address group for affinity and antagonist activity relative to the corresponding naltrexone derived antagonists, nor-BNI. The structural flexibility of the former class of compound relative to the latter is postulated to underlie the difference.
Metal and base free synthesis of primary amines via ipso amination of organoboronic acids mediated by [bis(trifluoroacetoxy)iodo]benzene (PIFA)
作者:Nachiketa Chatterjee、Avijit Goswami
DOI:10.1039/c5ob01070e
日期:——
A metal and base freesynthesis of primary amines has been developed at ambient temperature through ipso amination of diversely functionalized organoboronic acids, employing a combination of [bis(trifluoroacetoxy)iodo]benzene (PIFA)–N-bromosuccinimide (NBS) and methoxyamine hydrochloride as the aminating reagent. The amines were primarily obtained as their trifluoroacetate salts which on subsequent
在室温下,通过将[双(三氟乙酰氧基)碘]苯(PIFA)– N-溴代琥珀酰亚胺(NBS)和盐酸甲氧基胺结合使用的多种功能化的有机硼酸进行ipso胺化反应,开发了伯胺的无金属和碱合成法。胺化试剂。胺主要以其三氟乙酸盐的形式获得,其在随后的碱性水溶液处理中提供相应的游离胺。与用于活化胺化剂的常用强碱(例如n- BuLi,Cs 2 CO 3)相比,发现PIFA-NBS的组合是最温和的选择。预计反应将通过 胺化试剂活化,然后由B–N 1,2-芳基迁移。
Binaltorphimine-related bivalent ligands and their .kappa. opioid receptor antagonist selectivity
作者:P. S. Portoghese、H. Nagase、A. W. Lipkowski、D. L. Larson、A. E. Takemori
DOI:10.1021/jm00399a026
日期:1988.4
In an effort to develop selective antagonists for kappa opioidreceptors, bivalentligands that contain opioid antagonist pharmacophores derived from naltrexone or other morphinans were synthesized and tested on the guinea pig ileum (GPI) and mouse vas deferens (MVD) preparations. The minimum requirements for kappa selectivity are at least one free phenolic OH group and one N-cyclopropyl or N-ally
An asymmetrichydrogenation of hydrazones with a unique nickel catalyst has been developed for the synthesis of chiral hydrazines with up to 99 % yield and 99.4 : 0.6 er and a broad substrate scope. Deuterium labelling experiments indicated that the hydrazone substrates undergo imine-enamine tautomerization in the mixed solvents.
The crystal structures of the title compounds, C12H18N2O4, have been determined in order to establish the relative configurations. In both structures, the isopropyl substituent strongly prefers the quasi-equatorial position. Therefore, the exo isomer adopts a dioxepanoaziridine pattern of a chair - chair (CC) conformation and the endo isomer a boat - chair (BC) conformation.
PORTOGHESE, P. S.;NAGASE, H.;TAKEMORI, A. E., J. MED. CHEM., 31,(1988) N 7, 1344-1347