使用分子碘作为合成苯并咪唑衍生物的唯一氧化剂,已经实现了分子内芳基CH氨基化反应。通过将芳基胺与相应的腈或芳基碘加成或偶联,可以轻松制备所需的底物。在以碳酸钾(K 2 CO 3)为碱的情况下,这些底物的碘介导的氧化环化作用可提供中等至良好收率的相应产物。此处介绍的无过渡金属协议对空气不敏感,操作简单。这种通用且环保的合成方法学广泛适用于各种N芳基取代的am和吡啶2胺,可直接接触1 H来自相应前体的-苯并[ d ]咪唑和吡啶并[1,2- a ]苯并咪唑衍生物。
使用分子碘作为合成苯并咪唑衍生物的唯一氧化剂,已经实现了分子内芳基CH氨基化反应。通过将芳基胺与相应的腈或芳基碘加成或偶联,可以轻松制备所需的底物。在以碳酸钾(K 2 CO 3)为碱的情况下,这些底物的碘介导的氧化环化作用可提供中等至良好收率的相应产物。此处介绍的无过渡金属协议对空气不敏感,操作简单。这种通用且环保的合成方法学广泛适用于各种N芳基取代的am和吡啶2胺,可直接接触1 H来自相应前体的-苯并[ d ]咪唑和吡啶并[1,2- a ]苯并咪唑衍生物。
P<sup>(III)</sup>-Promoted Reductive Coupling of Aromatic and Aliphatic Nitro Compounds with Grignard Reagents
作者:Shan-Shui Meng、Fei Li、Xiaowen Tang、Albert S. C. Chan
DOI:10.1021/acs.orglett.3c01167
日期:2023.5.26
coupling of nitro compounds with Grignard reagents is described. Polyfunctional and pharmaceutically relevant diarylamines were generated by this reaction in moderate to high yields. Aliphatic nitro compounds that are highly challenging substrates undergo a combination of α-arylation and reductive coupling to afford the α-arylated arylamines efficiently. A series of valuable biaryl compounds with polyfluorinated
Substituted amino-pyridine derivatives, processes for their preparation and pharmaceutical compositions containing them
申请人:BEECHAM GROUP PLC
公开号:EP0000816A1
公开(公告)日:1979-02-21
A class of substituted amino pyridine derivatives are of value in the treatment of diabetes. Some of the compounds also possess hypolipidaemic activity.
The compounds are represented by the formula (I):
wherein R3 is hydrogen, alkyl or an acidic function;
R2 is hydrogen or alkyl;
R4 and R' are hydrogen, alkyl or halogen;
Z is hydrogen, phenyl, alkyl or aralkyl;
Alk is alkylene and x is 0 or 1;
R1 is optionally substituted phenyl or naphthyl.
Most of the compounds of formula (I) are novel.
LIQUID CRYSTAL ALIGNMENT AGENT COMPOSITION, METHOD FOR PREPARING LIQUID CRYSTAL ALIGNMENT FILM USING SAME, AND LIQUID CRYSTAL ALIGNMENT FILM AND LIQUID CRYSTAL DISPLAY DEVICE USING SAME
申请人:LG CHEM, LTD.
公开号:EP3617294A1
公开(公告)日:2020-03-04
The present invention relates to a liquid crystal aligning agent composition, a method for preparing a liquid crystal alignment film using the same, and a liquid crystal alignment film and a liquid crystal display using the same, and specifically to a liquid crystal aligning agent composition including a hindered amine-based light stabilizer together with a polyamic acid polymer derived from a diamine having a specific structure, a method for preparing a liquid crystal alignment film using the same, and a liquid crystal alignment film and a liquid crystal display using the same.
Liquid crystal aligning agent composition, method for preparing liquid crystal alignment film using same, and liquid crystal alignment film using same
申请人:LG CHEM, LTD.
公开号:US10982147B2
公开(公告)日:2021-04-20
The present invention relates to a liquid crystal aligning agent composition for forming a liquid crystal alignment film exhibiting excellent alignment and electrical characteristics and simultaneously having excellent film strength, a method for preparing a liquid crystal alignment film using the same, and a liquid crystal alignment film and a liquid crystal display device using the same.
Liquid crystal alignment agent composition, method for preparing liquid crystal alignment film using same, and liquid crystal alignment film and liquid crystal display using same
申请人:LG CHEM, LTD.
公开号:US11149204B2
公开(公告)日:2021-10-19
Provided is a liquid crystal alignment agent composition comprising a terminal modifier compound containing an amino group together with a polyimide containing an acid anhydride group at its terminus or a precursor polymer thereof, a method for preparing a liquid crystal alignment film using the same, and a liquid crystal alignment film and a liquid crystal display using the same.