Dosing form for reagents, use of said dosing form in organic chemical synthesis and production of said dosing form
申请人:H. Lundbeck A/S
公开号:US20030138376A1
公开(公告)日:2003-07-24
A dosing form for at least one solid reagent for use in conventional organic and inorganic synthesis, in parallel synthesis, and in split and mix synthesis in combinatorial chemistry is provided as compressed tablets each containing the same predetermined amount of said at least one reagent embedded in a polymer matrix comprising beads of a polymer insoluble in the solvents for the intended synthesis, which tablets are capable of disintegrating in said solvent for release of the at least one reagent and disperse the matrix as polymer beads into the solvent. The polymer beads forming the matrix and the reagents of the dosing form can easily be removed by filtration in order to separate these from a formed soluble product.
In a method for producing the dosing form, beads of one or more polymers are mixed with the reagents and compressed into tablets after pre-treatment with an aprotic organic solvent.
Rhodium‐Catalyzed Asymmetric Synthesis of β‐Branched Amides
作者:Zhao Wu、Joshua D. Laffoon、Trang T. Nguyen、Jacob D. McAlpin、Kami L. Hull
DOI:10.1002/anie.201610500
日期:2017.1.24
synthesis of chiral β‐branched amides is reported through the highly enantioselective isomerization of allylamines, followed by enamine exchange, and subsequent oxidation. The enamine exchange allows for a rapid and modular synthesis of various amides, including challenging β‐diaryl and β‐cyclic.
The technology of surfactant chemistry is employed for amide bond construction via the reaction of acyl chlorides with amines in 2 wt % TPGS-750-M aqueous solution. Specifically, this highly efficient method enables a chromatography-free scalable process and recycling of the TPGS-750-M solution.
Tributyl phosphine or nickel catalysts allow the cross-coupling reaction between N,N-dialkylcarbamoyl chlorides and alkyl or aryl Grignard reagents. This convenient and simple method affords tertiary amides with moderate to excellent yields in short reaction times.
Direct amide formation in a continuous-flow system mediated by carbon disulfide
作者:György Orsy、Ferenc Fülöp、István M. Mándity
DOI:10.1039/d0cy01603a
日期:——
etc. and they are used in various synthetic drugs too. Amide bonds are mainly made by the use of (i) hazardous carboxylic acid derivatives or (ii) expensive coupling agents. Both ways make the synthetic technology less atom economic. We report a direct flow-based synthesis of amides. The developed approach is prominently simple and various aliphatic and aromatic amides were synthetized with excellent