An automated synthesis system, which is suitable for repetitive syntheses using similar reaction procedures, was used to synthesize systematically a library of all possible dipeptides (25) and tripeptides (125) from 5 protected amino acids. The apparatus has also been applied to the automated synthesis of 10 fragment tripeptide derivatives that are constituents of the hormone PACAP-27. The measured molecular optical rotation values of the library of 125 tripeptides were found to correlate well with calculated values obtained by summation of the molecular optical rotation values for the constituent amino acids.
An improved general method for automated synthesis of tripeptides was developed, in which methanesulfonic acid (MSA) was used in place of trifluoroacetic acid (TFA), thus making it possible to avoid, 1) corrosion of the apparatus by strong acid vapor, 2) formation of emulsions, and 3) use of the restricted solvent, dichloromethane. As an application of the automated synthesis apparatus, 216 fragment tripeptide derivatives were synthesized systematically using the MSA method, in excellent yield and with increased efficiency.
[EN] SPIRO-LACTAM NMDA RECEPTOR MODULATORS AND USES THEREOF<br/>[FR] SPIRO-LACTAME MODULATEUR DE RÉCEPTEURS NMDA ET LEURS UTILISATIONS
申请人:APTINYX INC
公开号:WO2019152688A1
公开(公告)日:2019-08-08
Disclosed are compounds having potency in the modulation of NMDA receptor activity. Such compounds can be used in the treatment of conditions such as depression and related disorders as well as other disorders.
Chemo-enzymatic synthesis of glycopolymers and sequential glycopeptides bearing lactosamine and sialyl Lewisx unit pendant chains
作者:Florence Sallas、Shin-Ichiro Nishimura
DOI:10.1039/b001612h
日期:——
A variety of glycoconjugates bearing either N-acetyllactosamine or sialyl Lewisx units have been synthesised in a chemo-enzymatic way. This includes the synthesis of glycopolymer copolymerised with acrylamide and whose glucosamine unit was substituted with different kinds of side-chain. Glycopeptides with different spacer-arm glucosamine units have also been prepared and polymerised. The sugar chain
N-(mercaptoacyl)amino acids, methods of their preparation and therapeutic use, and pharmaceutical compositions containing them
申请人:INSTITUT NATIONAL DE LA SANTE ET DE LA
RECHERCHE MEDICALE (INSERM)
公开号:EP0539848A1
公开(公告)日:1993-05-05
The present invention is directed to a compound of the formula (I)
wherein
R represents a hydrogen atom or an acyl, aroyl or cycloalkylcarbonyl radical or a residue of formula
R₁ represents an alkyl radical;
R₂ represents an aryl or heteroaryl radical, or R₁ represents an alkylene chain attached to a carbon atom in an ortho position of the R₂ aryl or heteroaryl radical relative to a carbon of the R₂ aryl or heteroaryl radical linked to the propanoyl moiety;
R₃ represents a hydrogen atom or an alkyl, aryl, alkoxy or aryloxy radical; and
R' represents a hydrogen atom or an alkyl, aralkyl, acyl or aroyl radical;
and the pharmaceutically acceptable salts thereof.
The invention is also directed to the preparation of these compounds, pharmaceutical compositions comprising the compounds and methods for their pharmaceutical use.