Palladium(II)-Catalyzed Dehydrogenative Alkenylation of Cyclic Enaminones via the Fujiwara–Moritani Reaction
摘要:
A new Pd(II)-catalyzed dehydrogenative alkenylation reaction involving two alkenes was developed. A variety of nonaromatic, cyclic enaminones were successfully coupled to primary and secondary alkenes yielding a series of unique 1,3-dienes. The generality of this transformation presents a useful strategy for directly cross-coupling alkenes and offers an attractive new approach to functionallze enaminones.
Palladium(II)-Catalyzed Dehydrogenative Alkenylation of Cyclic Enaminones via the Fujiwara–Moritani Reaction
摘要:
A new Pd(II)-catalyzed dehydrogenative alkenylation reaction involving two alkenes was developed. A variety of nonaromatic, cyclic enaminones were successfully coupled to primary and secondary alkenes yielding a series of unique 1,3-dienes. The generality of this transformation presents a useful strategy for directly cross-coupling alkenes and offers an attractive new approach to functionallze enaminones.
Biomimetic Aerobic CH Olefination of Cyclic Enaminones at Room Temperature: Development toward the Synthesis of 1,3,5-Trisubstituted Benzenes
作者:Yi-Yun Yu、Gunda I. Georg
DOI:10.1002/adsc.201300904
日期:2014.4.14
A green and mild protocol for the dehydrogenative olefination of cyclicenaminones was devised via palladium catalysis at roomtemperature using oxygen as the terminal oxidant. The synthetic utility of the olefinated cyclicenaminones afforded a series of unique 1,3,5‐trisubstituted benzenes via an unanticipated Diels–Alder tandem reaction. The broad substrate scope and good yields achieved with this
Thermal and Emission Properties of a Series of Lanthanides Complexes with N-Biphenyl-Alkylated-4-Pyridone Ligands: Crystal Structure of a Terbium Complex with N-Benzyl-4-Pyridone
作者:Florentina L. Chiriac、Monica Iliş、Augustin Madalan、Doina Manaila-Maximean、Mihail Secu、Viorel Cîrcu
DOI:10.3390/molecules26072017
日期:——
luminescence properties of the lanthanidecomplexes of Eu(III), Sm(III) and Tb(III) with N-biphenyl-alkylated-4-pyridone ligands. The organic ligands having a biphenyl group attached via a long flexible spacer with either 9 or 10 carbon atoms were synthesized by the reaction between 4-hydroxypyridine and the corresponding bromide compounds. The chemical structures of the organic and lanthanidecomplexes were
这项工作专注于研究Eu(III),Sm(III)和Tb(III)与N-联苯基烷基化的4-吡啶酮配体的镧系元素配合物的液晶行为和发光特性。通过4-羟基吡啶和相应的溴化物化合物之间的反应,合成了具有通过长的柔性间隔基与9个或10个碳原子连接的联苯基的有机配体。根据元素分析,单晶X射线衍射,1 H,13分配有机和镧系元素配合物的化学结构13 C NMR和IR光谱,以及热重分析(TGA)。母体化合物的X射线衍射分析表明,镧系元素离子被三个单齿吡啶酮配体和三个二齿硝酸根离子包围,从而形成9坐标的环境。通过差示扫描量热法(DSC)和偏振光学显微镜(POM)以及粉末X射线衍射(XRD)研究分析了新配合物表现出的介晶行为和液晶相类型。仅具有较长间隔基(10)的镧系元素络合物显示出单向性SmA相,通常在较短的热范围内(低于10°C)。具有较短柔性链的配合物(9)的熔融温度低于具有较长间隔基的类似物时,没有显示液晶性质。
Addition of novel benzylmagnesium “ate” complexes of BnR2MgLi type to 2-(thio)pyridones and related compounds
作者:Jacek G. Sośnicki、Tomasz Idzik、Aleksandra Borzyszkowska、Emil Wróblewski、Gabriela Maciejewska、Łukasz Struk
DOI:10.1016/j.tet.2016.12.024
日期:2017.2
Novel benzylation reagents BnR2MgLi were obtained by mixing benzylmagnesium chloride (BnMgCl) and appropriate organolithiumcompounds (RLi). As BnR2MgLi complexes are more nucleophilic than the parent Grignardcompound they enabled regioselective C6-addition to electrophilic N-substituted 2-(thio)-pyridones and C4-addition to poorly reactive NH 2-(thio)pyridones in high and good yields, respectively
Quaternary heterocyclylamino .beta.-lactams: a generic alternative to the classical acylamino side chain
作者:John Hannah、Charles R. Johnson、Arthur F. Wagner、Edward Walton
DOI:10.1021/jm00346a024
日期:1982.4
beta-[(1-substituted-4-pyridinio)amino]ceph-3-em-4-carboxylates have been found to be interesting new classes of antibacterial beta-lactams, readily available by SN2 Ar coupling of fluoro-substituted quaternized pyridines and appropriate amino lactam carboxylic acids. Compared to penicillin G, the penam 12c exhibited a spectrum extended to Gram-negative species, such as Escherichia, Shigella, Klebsiella