Regio‐ and Enantioselective Formal Hydroamination of Enamines for the Synthesis of 1,2‐Diamines
作者:Lu Yu、Peter Somfai
DOI:10.1002/anie.201902642
日期:2019.6.17
The asymmetric formal hydroamination of enamines using a CuH catalyst is reported. The method provides a straightforward and efficient approach to the synthesis of chiral 1,2‐dialkyl amines in good yields with high levels of enantioselectivities for a broad range of substrates, and should have significant value for the preparation of molecules bearing a 1,2‐diamine motif.
Broadening the Scope of Group 4 Hydroamination Catalysis Using a Tethered Ureate Ligand
作者:David C. Leitch、Philippa R. Payne、Christine R. Dunbar、Laurel L. Schafer
DOI:10.1021/ja906955b
日期:2009.12.30
A broadly applicable group-4-based precatalyst for the hydroamination of primary and secondary amines was developed. Screening experiments involving a series of amide and urea proligands led to the discovery of a tetheredbis(ureate) zirconium complex with unprecedented reactivity in the intermolecular hydroamination of alkynes and the intramolecularhydroamination of alkenes. This catalyst system is
A wide range of amines and hydrazines were synthesized according to an electrophilic amination protocol by oxidative decomposition of readily generated lithium- and zinc-amidocyanocuprates. Optimization of the yields was achieved by the appropriate combination of the organometallic cluster and the nature of the oxidizing agent.
Isolation of Catalytic Intermediates in Hydroamination Reactions: Insertion of Internal Alkynes into a Zirconium-Amido Bond
作者:David C. Leitch、Courtney S. Turner、Laurel L. Schafer
DOI:10.1002/anie.201001927
日期:2010.8.23
Insert alkyne to continue: Reaction of a bis(ureate) zirconium dimethylamido complex with electron‐rich alkynes leads to vinylamine insertion products (see scheme). The insertion of CC unsaturated bonds into MN bonds is proposed as a key step in lanthanide chemistry and, more recently, hydroamination reactions catalyzed by Group 4 metals. For the first time, these elusive intermediates have been
An object of the present invention is to provide a cell-adhesive material for biological tissues, in which the surface of a material for biological tissues (particularly metallic material) is modified strongly with a large amount of a cell-adhesive artificial peptide (P) that retains a biological activity.
The present invention provides a cell-adhesive material for biological tissues including a cell-adhesive artificial peptide (P) and a material for biological tissues, wherein the cell-adhesive artificial peptide (P) is immobilized on the surface of the material for biological tissues through an electrochemical reaction. The cell-adhesive artificial peptide (P) is preferably a peptide (P1) that is synthesized by a genetic recombinant microorganism and has at least one cell-adhesive minimal amino acid sequence (X) in one molecule. The number of the cell-adhesive minimal amino acid sequences (X) in one molecule of the polypeptide (P1) is preferably 3 to 50.