Utility of Complementary Molecular Reactivity and Molecular Recognition (CMR/R) Technology and Polymer-Supported Reagents in the Solution-Phase Synthesis of Heterocyclic Carboxamides
摘要:
The use of our recently reported chemical library purification strategy in the development of a herbicidal lead, N-(3-benzoylphenyl)-3-(1,1-dimethylethyl)-1-methyl-1H-pyrazole-5-carboxamide (3), is described. The approach applying fundamental properties of complementary molecular reactivity and molecular recognition (CMR/R) as the basis for a general purification strategy was utilized. Polymeric reagents were used in the synthesis to generate reactive species involved in product formation, and complementary molecular reactivity/molecular recognition polymer 8 (CMR/R polymer 8) was used in the solution-phase syntheses of building blocks, primary libraries, and lead refinement libraries. An extension of the CMR/R methodology was applied, utilizing a sequestration enabling reagent (SER), transforming a reactant into an electrophilic species sequestrable by CMR/R polymer 8. This library purification strategy enabled rapid lead generation and lead refinement to afford herbicide 27o. The CMR/R solid-phase purification technique enabled a simple, general, and powerful protocol, eliminating the usual tedious and time-consuming methods required for solution-phase product purification. The result was the synthesis of hundreds of compounds, prepared in a relatively short time, leading to a compound with a 4-fold improvement in herbicidal activity over the initial lead.
Photocatalytic C–H Amination of Aromatics Overcoming Redox Potential Limitations
作者:Tatsuya Morofuji、Gun Ikarashi、Naokazu Kano
DOI:10.1021/acs.orglett.0c00822
日期:2020.4.3
report the photocatalytic C–H amination of aromatics overcoming redox potential limitations. Radical cations of aromatic compounds are generated photocatalytically using Ru(phen)3(PF6)2, which has a reduction potential at a high oxidation state (Ered(RuIII/RuII) = +1.37 V vs SCE) lower than the oxidation potentials of aromatic substrates (Eox = +1.65 to +2.27 V vs SCE). The radical cations are trapped
我们报道了克服氧化还原潜在限制的芳香族化合物的光催化C–H胺化反应。使用Ru(phen)3(PF 6)2光催化生成芳香族化合物的自由基阳离子,该Ru(phen)3(PF 6)2在高氧化态下的还原电势(E red(Ru III / Ru II)= +1.37 V vs SCE)低于三氧化二砷。芳香族底物的氧化电位(E ox = +1.65至+2.27 V vs SCE)。自由基阳离子被吡啶捕获,得到N-芳基吡啶鎓离子,该离子被转化为芳族胺。
Non-linear optical device
申请人:HITACHI, LTD.
公开号:EP0315140A2
公开(公告)日:1989-05-10
According to the present invention, there is provided a non-linear optical device comprising a non-linear optical medium comprising an organic compound, which remarkably improves the non-linear optical properties. The non-linear optical device according to the present invention is suited for the second and third harmonic generations, photomixing optical parametric oscillations, optical switches and optical bistable devices.