Imidazo[2,2-b][3]benzazepine and pyrimido[2,1-b][3]benzazepine
申请人:Sterling Drug Inc.
公开号:US05106844A1
公开(公告)日:1992-04-21
Novel imidazo[2,1-b][3]benzazepines and pyrimido[2,1-b][3]benzazepines of formula I, pharmaceutical compositions containing them, methods for treating cardiac arrhythmia in mammals utilizing them, and processes for synthesizing them. ##STR1##
Palladium Complexes Bearing Mesoionic Carbene Ligands: Applications in α‐Arylation, α‐Methylation and Suzuki–Miyaura Coupling Reactions
作者:Ramananda Maity、Amit Verma、Margarethe van der Meer、Stephan Hohloch、Biprajit Sarkar
DOI:10.1002/ejic.201501031
日期:2016.1
yields for both α-arylation and Suzuki–Miyaura coupling reactions. A palladium(II) complex bearing two MIC units in a trans fashion is used for chemoselective Suzuki–Miyaura coupling reaction. This complex delivers lower yields in α-arylation reactions compared with PEPPSI-type complexes, however, it gives an α-methylated product when the reaction is conducted in N,N-dimethylformamide. Mercury poisoning
介离子卡宾 (MIC) 配体的配合物在有机金属化学和均相催化中越来越受欢迎。我们在此展示了一系列由 MIC 供体配体组成的钯 (II) 配合物,并展示了它们在 α-芳基化、α-甲基化和 Suzuki-Miyaura 偶联反应中的应用。所有配合物均已通过 X 射线晶体学分析进行结构表征。这些钯 (II) 配合物是有效的预催化剂,它们为 α-芳基化和 Suzuki-Miyaura 偶联反应提供了良好的产率。以反式方式带有两个 MIC 单元的钯 (II) 复合物用于化学选择性 Suzuki-Miyaura 偶联反应。与 PEPPSI 型配合物相比,这种配合物在 α-芳基化反应中的产率较低,但是,当反应在 N,N-二甲基甲酰胺中进行时,得到 α-甲基化产物。汞中毒实验表明 Suzuki-Miyaura 偶联反应可能通过 Pd 纳米粒子进行。然而,如阴性汞毒试验所示,α-芳基化反应是均匀进行的。因此,目前的结果为
VEJDELEK, ZDENEK;PROTIVA, MIROSLAV, COLLECT. CZECHOSL. CHEM. COMMUN., 55,(1990) N, C. 2345-2350