Characterization of a Brain Permeant Fluorescent Molecule and Visualization of Aβ Parenchymal Plaques, Using Real-Time Multiphoton Imaging in Transgenic Mice
摘要:
Emerging paradigms mandate discovery of imaging agents for diagnosing Alzheimer's disease (AD) prior to appearance of clinical symptoms. To accomplish this objective, a novel heterocyclic molecule (4) was synthesized and validated as A beta targeted probe. The agent shows labeling of numerous diffuse A beta plaques in confirmed AD human brain tissues and traverses the blood brain barrier to enable labeling of parenchymal A beta plaques in live mice (APP(+/-) /PS1(+/-)) brains.
Mild and efficient synthesis of indoles and isoquinolones<i>via</i>a nickel-catalyzed Larock-type heteroannulation reaction
作者:Wei-Zhi Weng、Jian Xie、Bo Zhang
DOI:10.1039/c8ob00795k
日期:——
A simple and efficient approach for the preparation of substituted indoles and isoquinolones via a nickel-catalyzed Larock-type heteroannulation reaction is reported. This transformation employed air-stable and inexpensive Ni(dppp)Cl2 as a precatalyst and Et3N as a mild base. Moreover, the reaction occurs efficiently under mild conditions, and a wide range of substituted indoles and isoquinolones bearing
Efficient and Economical Access to Substituted Benzothiazoles: Copper-Catalyzed Coupling of 2-Haloanilides with Metal Sulfides and Subsequent Condensation
Don′t tell azole: The first metal‐catalyzed direct coupling of metalsulfides with aryl halides and subsequent intramolecular condensation provided substitutedbenzothiazoles (see scheme). A wide range of functional groups are tolerated under the reaction conditions.
An efficient heterogeneous copper-catalyzed cyclization of o-haloanilides and metalsulfides has been achieved via the C–S coupling in DMF at 80 or 140 °C in the existence of an MCM-41-bound NHC-Cu(I) catalyst and then intramolecular condensation, delivering a wide range of substitutedbenzothiazoles in mostly good to high yields. This new MCM-41-NHC-CuI complex can facilely be obtained by a two-step
Cobalt(<scp>ii</scp>)-catalyzed regioselective C–H halogenation of anilides
作者:Ze-lin Li、Kang-kang Sun、Chun Cai
DOI:10.1039/c8ob01448e
日期:——
A cobalt-catalyzed regioselective C–H halogenation methodology is reported herein. The highlight of this work is the highly selective C–H functionalization of anilides, which results in high-yielding, versatile, and practical halogenated products. Thereby, brominations, chlorinations and iodinations of many electron-rich and electron-deficient anilides were achieved in a highly selective fashion. Mechanistic
A new method for the generation of indole-2,3-quinodimethanes and 2-(N-alkoxycarbonylamino)-1,3-dienes. Intramolecular Heck/Diels–Alder cycloaddition cascade starting from acyclic α-phosphono enecarbamates
作者:Haruhiko Fuwa、Makoto Sasaki
DOI:10.1039/b704374k
日期:——
An intramolecular Heck/DielsâAlder cycloaddition cascade starting from acyclic α-phosphono enecarbamates has been developed to prepare nitrogen heterocycles viaindole-2,3-quinodimethanesand 2-(N-alkoxycarbonylamino)-1,3-dienes.