摘要:
The instant invention describes a novel asymmetric synthesis of fluoroleucine alkyl esters which utilizes allylation of a glycine derivative containing an imine moiety in the presence of a phase transfer catalyst and a solid additive, followed by fluorination of the alpha-allyl product so obtained, with a fluorinating agent such as Olah's reagent.
摘要:
Die vorliegende Erfindung betrifft ein Verfahren zur Herstellung von Aminocarboxylaten, ausgehend von Aminen durch Anwendung einer Reaktionssequenz aus Ethoxylierung zu Aminoalkoholen und nachfolgender oxidativer Dehydrierung zu den entsprechenden Aminocarboxylaten, insbesondere den Alkali- bzw. Erdalkalisalzen der Komplexbildner MGDA (Methylglycindiessigsäure), EDTA (Ethylendiamintetraessigsäure) und GLDA (Glutaminsäurediessigsäure) bzw. deren freien Säuren.
摘要:
The invention discloses the use of allylcysteine or its analogs in preparation of medicaments for preventing or treating myocardial damage and the preparation method thereof. The invention further discloses the pharmaceutical composition comprising allylcysteine or its analogs.
摘要:
This invention relates to non-natural desamino amino acid compounds, methods of making, and peptides containing these compounds as their N-terminus moieties. A preferred example is neurotensin (8-13) in which the N terminus is an alpha desamino N,N dimethyl homolysine residue.
摘要:
One aspect of the invention relates to hexafluoroleucine and congeners thereof, and methods of making the compounds. Another aspect of the nvention relates to the synthesis of protein cores comprising hexafluoroleucine and congeners thereof. Certain peptides comprising hexafluorleucine and congeners thereof have been characterized using comparative biophysical studies. In general, the fluorinated peptides show higher thermal stability and enhanced resistance to chemical denaturation. Further, mixed hydrocarbonfluorocarbon cores self-sort into homogeneous bundles, suggesting new avenues for the design and manipulation of protein-protein interfaces.
摘要:
Efficient synthetic methods towards mixed aliphatic carbonates through the three component couplings of aliphatic alcohols, alkyl halides and carbon dioxide in the presence of cesium carbonate and tetrabutylammonium iode (TBAI). Due to their enhanced nucleophilicities, cesium alkoxides are smoothly incorporated into CO2, allowing for mild reaction conditions such as ambient temperatures and short reaction durations. Various primary and secondary substrates are compatible under the standard conditions, offering high yields, while chiral templates such as alpha -hydroxy carbonyls are resistant to racemization.
摘要:
Benzyl esters of amino acids having high optical purities can be readily prepared by reacting optically active amino acids with benzyl alcohols either in the presence of a hydrazine or in the absence of oxygen, or alternatively in the presence of a hydrazine and in the absence of oxygen.