Ni(0)-Trialkylphosphine Complexes. Efficient Homo-coupling Catalyst for Aryl, Alkenyl, and Heteroaromatic Halides
作者:Kentaro Takagi、Naomi Hayama、Ken Sasaki
DOI:10.1246/bcsj.57.1887
日期:1984.7
Bis(trialkylphosphine)nickel(0) generated in situ from bis(trialkylphosphine)nickel(II) chloride was found to be an effective catalyst for a homo-coupling of aryl, alkenyl, or heteroaromatic halides with zinc powder. The catalytic reaction proceeded very well in NMP or HMPA solvent under mild conditions to afford dehalogenative-coupling products in good yields.
A convenient synthetic route to bis-heteroaromatic and bis-heterocyclic compounds promoted by liganded nickel complex reducing agents.
作者:Yves Fort、Sandrine Becker、Paul Caubère
DOI:10.1016/s0040-4020(01)89303-0
日期:1994.1
A number of nitrogen, sulfur or oxygen containing bis-heteroaromatic or bis-heterocyclic derivatives have been synthesized in good to excellent yields by homo-coupling of the corresponding halogenated compounds in the presence of liganded (triphenylphospine or 2,2'-bipyridine) nickel Complex Reducing Agents in THF or DME at 63 degrees C.
[EN] ELECTRO-ACTIVE MACROCYCLIC OLIGOARENES AND OLIGOHETEROARENES WITH STEREOGENIC AXES<br/>[FR] OLIGOARÈNES MACROCYCLIQUES ÉLECTRO-ACTIFS ET OLIGOHÉTÉROARÈNES À AXES STÉRÉOGÉNIQUES
申请人:UNIV DEGLI STUDI MILANO
公开号:WO2015177763A9
公开(公告)日:2016-01-21
Suzuki–Miyaura reactions of the soluble guanylate cyclase inhibitor NS2028: a non-product specific route to C-8 substituted analogues
作者:Andrey A. Berezin、Panayiotis A. Koutentis
DOI:10.1016/j.tet.2011.04.003
日期:2011.6
Both soluble guanylate cyclase (sGC) inhibitors ODQ 1 and NS2028 2 are synthesized via improved protocols. In the former case treating 3,4-dihydroquinoxalin-2(1H)-one oxime 8, which can be prepared in two steps from 1,2-benzenediamine, with 1,1'-carbonyldiimidazole (CDI) gives the dihydro-ODQ 10 that in the presence of KMnO4 oxidises to give ODQ 1 in an overall yield of 46% starting from 1,2-benzenediamine. In the latter case, the synthesis affords NS2028 2 from 2-amino-4-bromophenol 3 in three steps with an overall yield of 85% and avoids the need for chromatography. Furthermore, Suzuki-Miyaura reaction conditions are described that enable the preparation of 8-aryl and 8-heteroaryl derivatives of NS2028 directly from NS2028 2. Finally, demethylation of the 8-(methoxyphenyl) substituted analogues afforded the 8-(hydroxyphenyl) derivatives 40-42. All new products are fully characterised. (C) 2011 Elsevier Ltd. All rights reserved.