一系列吡咯并[2,1-a]异喹啉和相关化合物由于对丁苯那嗪诱导的上睑下垂和镇静作用以及对生物胺吸收的抑制作用而被检测为抗抑郁样活性。因此,我们已经鉴定出有史以来报道的一些最有效的TBZ诱导上睑下垂拮抗剂和一些最有效的多巴胺,去甲肾上腺素和血清素摄取抑制剂(在大鼠脑突触体中)。在这方面,特别值得注意的化合物分别是52b,29b,22b和48b。生物活性主要由反式异构体表现出来。而且,通过拆分四种化合物7b,24b,37b和48b,发现生物活性与(+)对映异构体亚组(在589 nm在MeOH中测得的盐)相关,对应于6S,10bR的绝对构型7b,37b,和48b,以及24b的6R,10bR配置。在(+)-24b X HBr上进行X射线测定,确定了其绝对构型;通过(+)-(R)-2-苯基吡咯烷开始的对映体特异性合成,验证了其他化合物的构型。关于侧苯环,研究了多种取代方式。那些特别不利的取代基是3'
Oxygen Activated, Palladium Nanoparticle Catalyzed, Ultrafast Cross-Coupling of Organolithium Reagents
作者:Dorus Heijnen、Filippo Tosi、Carlos Vila、Marc C. A. Stuart、Philip H. Elsinga、Wiktor Szymanski、Ben L. Feringa
DOI:10.1002/anie.201700417
日期:2017.3.13
The discovery of an ultrafast cross‐coupling of alkyl‐ and aryllithium reagents with a range of aryl bromides is presented. The essential role of molecular oxygen to form the active palladium catalyst was established; palladium nanoparticles that are highly active in cross‐coupling reactions with reaction times ranging from 5 s to 5 min are thus generated in situ. High selectivities were observed for
The quantitative structure-mutagenicity relationship among 8 substituted styrene oxides, p-methyl-, p-butyl, p-phenyl, p-chloro, m-chloro, p-cyano, p-nitro, and the parent styrene oxide, was examined. Mutagenic and cytocidal activities were correlated with the reactivity of the epoxide (Hammett's σ), the van der Waals volume of the molecule (VW), and/or the partition parameter (π). Multiple regression analyses revealed that mutagenic capacity could be well described by a linear combination of σ and log VW and that cytocidal capacity depended only on π of the derivatives, as already reported by Sugiura et al.