Pyridazine N-Oxides as Precursors of Metallocarbenes: Rhodium-Catalyzed Transannulation with Pyrroles
摘要:
Pyridazine N-oxides are used for the first time as precursors of metallocarbenes. These nitrogen-rich heterocycles led to the discovery of a novel acceptor and donor-acceptor enalcarbenoids. The synthetic utility of these metallocarbenes was demonstrated in the rhodium-catalyzed denitrogenative transannulation of pyridazine N-oxides with pyrroles to the valuable alkyl, 7-aryl, and 7-styryl indoles. The transannulation strategy was applied to the synthesis of a potent anticancer agent.
The present invention generally relates to various compounds that are useful as α-synuclein ligands. The invention further relates to methods of using these compounds and their radiolabeled analogs for the detection of synucleinopathies, including Parkinson's disease (PD).
Ruthenium(II)-Catalyzed C–H (Hetero)Arylation of Alkenylic 1,<i>n</i>-Diazines (<i>n</i> = 2, 3, and 4): Scope, Mechanism, and Application in Tandem Hydrogenations
C–H bond arylation. Mixtures of E:Z isomeric products were observed in some cases, which were further hydrogenated in a tandem manner in the presence of the remaining rutheniumcatalyst from the first step, representing an alternative approach to more difficult C(sp3)–H bond functionalization. According to mechanistic studies, the unexpected E:Z product formation seems to occur by thermal C═C bond isomerization
New pyrrolopyridazinederivatives were synthesized as potential blueorganicluminophors. Three different classes of pyrrolopyridazinederivatives were made, for example, aryl groups directly connected to the core PPY (pyrrolo[1,2-b]pyridazine-5,6,7-tricarboxylic acid trimethyl ester) moiety, aryl groups connected to the PPY via a vinylene linker and aryl groups connected to the PPY via an acetylene
合成了新的吡咯并哒嗪衍生物,作为潜在的蓝色有机发光体。制备了三种不同种类的吡咯并哒嗪衍生物,例如,直接连接到核心PPY(吡咯并[1,2 - b ]哒嗪-5,6,7-三羧酸三甲酯)部分上的芳基,将芳基连接到PPY上通过亚乙烯基连接基和通过乙炔连接基连接到PPY的芳基。他们的光学和电化学性能进行了比较。衍生物2之一显示出相对量子产率高达0.9。乙烯基桥联吡咯并哒嗪系列化合物8的特征在于其X射线晶体结构分析。
QUATERNARY AMMONIUM SALT-ASSISTED SYNTHESIS OF EXTENDED π-SYSTEMS FROM METHYLDIAZINES AND AROMATIC ALDEHYDES<sup>1</sup>
作者:Jean Jacques Vanden Eynde、Laurent Pascal、Yves Van Haverbeke、Philippe Dubois
DOI:10.1081/scc-100105893
日期:2001.1
4-Methyl- and 4,6-dimethylpyrimidines, methyl- and 2,5-dimethylpyrazines, as well as 3-methylpyridazine readily react with aromatic aldehydes in a hot solution of sodium hydroxide in the presence of a catalytic amount of a quaternary ammonium salt and in the absence of any organic solvent to yield the corresponding condensation products.
The present invention generally relates to various compounds that are useful as α-synuclein ligands. The invention further relates to methods of using these compounds and their radiolabeled analogs for the detection of synucleinopathies, including Parkinson's disease (PD).