the low reactivity of the Ar–NO2 bond toward oxidative addition. We report here the C–N coupling of nitroarenes and amines using palladium/5-(2,4,6-triisopropylphenyl)imidazolylidene[1,5-a]pyridines as the catalyst. The ligands are readily available from commercial chemicals. The reaction shows broad substrate scope and functionalgroup tolerance. The method is applicable to both aromatic and aliphatic
[EN] BLACK DICHROIC DYE<br/>[FR] COLORANT DICHROÏQUE NOIR
申请人:BASF SE
公开号:WO2011157614A1
公开(公告)日:2011-12-22
Described is a black dichroic dye composition comprising 2 or more dyes, wherein at least one dye, generally a red dye and optionally a yellow dye, conforms to the formula A and at least one dye, usually a blue dye, conforms to the formula B Ar1-N=N-[Ar2-N=N-]qAr3-N=N-Ar4 (B) with symbols as defined in present claims. The dye composition is well suited for combination with liquid crystal material for use, inter alia, as polarizing film and/or in liquid crystal displays, showing, inter alia, high dichroic ratio and excellent compatibility with the LC material.
[EN] METHOD OF PREPARATION OF NOVEL NUCLEOSIDE ANALOGS AND USES<br/>[FR] PROCEDE POUR PREPARER DE NOUVEAUX ANALOGUES DE NUCLEOSIDE, ET LEURS UTILISATIONS
申请人:AUSPEX PHARMACEUTICALS INC
公开号:WO2005049582A1
公开(公告)日:2005-06-02
Processes for the preparation of racemic and optically active nucleoside analogs of formula (A) are described. These compounds are useful as anti-infective agents, antisense therapeutic agents and hybridization assay probes.
A One-Pot Azido Reductive Tandem Mono-N-Alkylation Employing Dialkylboron Triflates: Online ESI-MS Mechanistic Investigation
作者:Nagula Shankaraiah、Nagula Markandeya、Vunnam Srinivasulu、Kokkonda Sreekanth、Ch. Sanjeeva Reddy、Leonardo S. Santos、Ahmed Kamal
DOI:10.1021/jo200931m
日期:2011.9.2
mono-N-alkylation of both aromatic and aliphatic azides using dialkylboron triflates as alkylating agents has been examined under standardized reaction conditions. This methodology after optimization has been employed toward the syntheses of various secondary alkyl as well as aryl amines, including the synthesis of N10-butylated pyrrolo[2,1-c][1,4]benzodiazepine-5,11-diones via in situ azido reductive-cyclization