C-H insertion. By employing chiral diphenylethylene diamine (dpen) as ligands bearing electron-withdrawing arylsulfonyl substituents, the reactions occur with remarkable chemo- and enantioselectivities; the competing Curtius-type rearrangement was largely suppressed. Enantioselective nitreneinsertion to allylic/propargylic C-H bonds was also achieved with remarkable tolerance to the C═C and C≡C bonds
[EN] A PROCESS FOR THE PREPARATION OF VIGABATRIN<br/>[FR] PROCÉDÉ DE PRÉPARATION DE VIGABATRINE
申请人:AUROBINDO PHARMA LTD
公开号:WO2019180547A1
公开(公告)日:2019-09-26
The present invention provides a process for the preparation of vigabatrin of formula (I) comprising of dissolving vigabatrin in water, optionally treating with charcoal, filtering and adding an acid to the reaction mass followed by the addition of an organic solvent and then isolating vigabatrin of formula (I) with high purity.
Cobalt-Catalyzed Coupling of Alkyl Iodides with Alkenes: Deprotonation of Hydridocobalt Enables Turnover
作者:Matthias E. Weiss、Lukas M. Kreis、Alex Lauber、Erick M. Carreira
DOI:10.1002/anie.201105235
日期:2011.11.18
Completing the cycle: Cobalt complexes I and II were found to catalyze intramolecular alkyl Heck‐type coupling reactions of alkyliodides to alkenes upon irradiation with visible light in the presence of a tertiary amine base. The use of base is key to the catalytic turnover. The compatibility of the method with a broad range of functional groups opens opportunities for synthesis.
A simple and robust one-pot nucleophilic addition–ring contraction of α-bromo N-sulfonylpyrrolidinones has been achieved toward α-carbonylated N-sulfonylazetidines. In the presence of potassium carbonate, various nucleophiles, such as alcohols, phenols or anilines, have been efficiently incorporated into the azetidine derivatives. Moreover, the α-bromopyrrolidinone precursors could be selectively obtained
[EN] AZO COMPOUND, AND PIGMENT DISPERSANT, PIGMENT COMPOSITION, PIGMENT DISPERSION AND TONER INCLUDING THE AZO COMPOUND<br/>[FR] COMPOSÉ AZOÏQUE ET DISPERSANT DE PIGMENT, COMPOSITION DE PIGMENT, DISPERSION DE PIGMENT ET TONER COMPRENANT LE COMPOSÉ AZOÏQUE
申请人:CANON KK
公开号:WO2012026607A1
公开(公告)日:2012-03-01
There is provided an azo compound for improvement in the dispersibility of an azo pigment into a water-insoluble solvent. The azo compound is represented by the following general formula (1): Wherein R1 represents alkyl, or phenyl; R2 to R6 represent hydrogen atom, or polymer represented by the general formula (2); R7 to R11 represent hydrogen atom, COOR12, or CONR13R14; R12 to R14 represent hydrogen atom, or alkyl: Wherein R15 represents hydrogen atom, or alkyl.