SECOND-ORDER NONLINEAR OPTICAL COMPOUND AND NONLINEAR OPTICAL ELEMENT COMPRISING THE SAME
申请人:Otomo Akira
公开号:US20120172599A1
公开(公告)日:2012-07-05
Problem to Be Solved: to provide a chromophore having a far superior nonlinear optical activity to conventional chromophores and to provide a nonlinear optical element comprising said chromophore.
Solution: a chromophore comprising a donor structure D, a π-conjugated bridge structure B, and an acceptor structure A, the donor structure D comprising an aryl group substituted with a substituted oxy group; and a nonlinear optical element comprising said chromophore.
A highly regioselective and enantioselective N-alkylation of isoxazol-5-ones with para-quinone methides promoted by bi-functional squaramide catalysts was developed. This unexpected asymmetric N-addition of isoxazolinones afforded a series of enantioenriched N-diarylmethane substituted isoxazolinones with high yields and enantioselectivities (up to 97 : 3 er). This reaction not only provides a useful
Divergent Conversion of 4-Naphthoquinone-substituted 4<i>H</i>-Isoxazolones to Different Benzo-fused Indole Derivatives
作者:Michael S. Christodoulou、Sabrina Giofrè、Egle M. Beccalli、Francesca Foschi、Gianluigi Broggini
DOI:10.1021/acs.orglett.0c00709
日期:2020.4.3
reaction conditions. A decarboxylative ring opening/ringclosure promoted by catalytic [Ru(p-cymene)2Cl2]2 yields benzo[f]indole-4,9-diones. Alternatively, hydrogenation reactions provide the conversion of 4-(1,4-naphthoquinone)-substituted isoxazol-5-ones to benzo[g]indole compounds, with the level of reduction depending on the substituents present on the ring. Starting materials have been easily prepared
带有1,4-萘醌部分的4,4-二取代的4 H-异恶唑-5-酮根据不同的反应条件转化成不同类型的苯并吲哚基产物。催化[Ru(p- Cymene)2 Cl 2 ] 2促进的脱羧开环/闭环反应生成苯并[ f ]吲哚-4,9-二酮。可选择地,氢化反应提供4-(1,4-萘醌)-取代的异恶唑-5-酮到苯并[ g ]吲哚化合物的转化,其还原水平取决于环上存在的取代基。通过在温和条件下用萘醌将异恶唑啉酮官能化,可以轻松制备起始原料。
Oxazolo[4,5-d]isoxazole Derivatives and 3,4-Disubstituted Isoxazoles from Isoxazol-5(4<i>H</i>)-ones
作者:E. M. Beccalli、A. Marchesini、T. Pilati
DOI:10.1080/00397919308009828
日期:1993.3.1
Abstract Synthesis for oxazolo[4,5-d]isoxazole derivatives and 3,4-disubstituted isoxazoles from isoxazol-5(4H)-ones is reported.
Ruthenium‐Catalyzed Decarboxylative Rearrangement of 4‐Alkenyl‐isoxazol‐5‐ones to Pyrrole Derivatives
作者:Letizia Molteni、Camilla Loro、Michael S. Christodoulou、Marta Papis、Francesca Foschi、Egle M. Beccalli、Gianluigi Broggini
DOI:10.1002/ejoc.202200496
日期:2022.7.7
Easily accessible isoxazol-5(4H)-ones are useful precursors of different heterocycles. In this work, the ruthenium-catalyzed transformation of 4-alkenyl-substituted isoxazol-5-ones to 1H-pyrrole derivatives is reported.
容易获得的异恶唑-5(4 H )-酮是不同杂环的有用前体。在这项工作中,报道了钌催化的 4-烯基取代的异恶唑-5-酮向 1 H-吡咯衍生物的转化。