formation of organozincreagents and subsequent cross-coupling with aryl halides and activated carboxylic acids is reported. Formation of organozincreagents is achieved by pumping organic halides, in the presence of ZnCl2 and LiCl, through an activated Mg-packed column under flow conditions. This method provides efficient in situ formation of aryl, primary, secondary, and tertiary alkyl organozinc reagents
[EN] BENZIIMIDAZOLE AND IMIDAZOPYRIDINE DERIVATIVES AS SODIUM CHANNEL MODULATORS<br/>[FR] DÉRIVÉS D'IMIDAZOPYRIDINE ET DE BENZIIMIDAZOLE EN TANT QUE MODULATEURS DU CANAL SODIUM
申请人:PFIZER
公开号:WO2013114250A1
公开(公告)日:2013-08-08
The invention relates to benzimidazole and imidazopyridine derivatives, to their use in medicine, to compositions containing them, to processes for their preparation and to intermediates used in such processes. More particularly the invention relates to new Nav1.8 modulators of formula (I) or pharmaceutically acceptable salts thereof, wherein R1, R2, R3, R4, R5, R6, R7. X and Y are as defined in the description. Nav1.8 modulators are potentially useful in the treatment of a wide range of disorders, particularly pain.
functionalized azetidines has been an ongoing challenge. Here, we report a general method to directly alkylate 1-azabicyclo[1.1.0]butane (ABB) with organometal reagents in the presence of Cu(OTf)2 to rapidly prepare bis-functionalized azetidines. This method allows for the preparation of azetidines bearing alkyl, allyl, vinyl, and benzyl groups. This catalyst system was extended to aziridines and spirocycles
Ligand-Free Copper-Catalyzed Negishi Coupling of Alkyl-, Aryl-, and Alkynylzinc Reagents with Heteroaryl Iodides
作者:Surendra Thapa、Arjun Kafle、Santosh K. Gurung、Adam Montoya、Patrick Riedel、Ramesh Giri
DOI:10.1002/anie.201502379
日期:2015.7.6
Reported herein is an unprecedented ligand‐free copper‐catalyzed cross‐coupling of alkyl‐, aryl‐, and alkynylzinc reagents with heteroaryl iodides. The reaction proceeds at room temperature for the coupling of primary, secondary, and tertiary alkylzincreagents with heteroaryl iodides without rearrangement. An elevated temperature (100 °C) is required for aryl–heteroaryl and alkynyl–heteroaryl couplings
Palladium-Catalyzed C–O Cross-Coupling of Primary Alcohols
作者:Hong Zhang、Paula Ruiz-Castillo、Stephen L. Buchwald
DOI:10.1021/acs.orglett.8b00325
日期:2018.3.16
catalyst systems are described, which together provide mild and general conditions for the Pd-catalyzed C–O cross-coupling of primary alcohols. For activated substrates, such as electron-deficient arylhalides, the commercially available ligand L2 promotes efficient coupling for a variety of alcohol nucleophiles. In the case of unactivated electrophiles, such as electron-rich arylhalides, the new