Results 111 to 120 of about 8,648 (155)

Synthesis and X-ray crystal structures of Schiff bases prepared from salicylaldehyde and the diamino acids L-2-amino-3-methylaminopropanoic acid, DL-2,4-diamino-butanoic acid and DL-2,3-diaminopropanoic acid

Tetrahedron, 1998
Abstract Three new Schiff bases have been synthesised from the reaction of salicylaldehyde with the plant amino acids l -2-amino-3-methylaminopropanoic acid ( l -MeDAP), dl -2,4-diaminobutanoic acid ( dl -DAB) and dl -2,3-diaminopropanoic acid ( dl -DAP). The reaction of salicylaldehyde with l -MeDAP gave only the 2- (α-) product. The reaction of
Saleem Mahmood, Mohammad Azad Malik, M. Motevalli, Peter B. Nunn, Paul O'Brien   +4 more
openaire   +1 more source

ChemInform Abstract: FORMATION OF HETEROCYCLIC AMINO ACIDS IN THE REACTION OF α,Δ‐ AND α,ε‐DIAMINO ACIDS WITH NITROSYLPENTACYANOIRON(II)

Chemischer Informationsdienst, 1981
AbstractOrnithin (Ia), Lysin und 5‐Hydroxylysin (Ib) büden bei der Reaktion mit dem Titelkomplex die chromatographisch identifizierten und isolierten heterocyclischen Aminosäuren Prolin (IIa) bzw. Piperolinsäure und dessen 5‐Hydroxy‐Derivat (IIb).
M. T. BECK, A. KATHO, L. DOZSA
openaire   +1 more source

ChemInform Abstract: STEREOSELECTIVE FORMATION OF AN α,α‐DIAMINO ACID RESIDUE BY THE ADDITION OF L‐α‐AMINO ACID TO α‐IMINO ACID

Chemischer Informationsdienst, 1981
AbstractDie durch Umsetzung des Dibrom‐imino‐buttersäureesters (I) mit den Aminosäureestern (II) zugänglichen Dibrom‐aminalester (III) lassen sich katalytisch zu den Aminalestern (IV) entbromieren.
C. SHIN, H. OHMATSU, Y. SATO, J. YOSHIMURA   +3 more
openaire   +1 more source

Amino acid transport by the small intestine of the rat on the counterflow phenomenon as a cause of the accelerating effect of leucine on the transintestinal transport of diamino acids

Biochimica et Biophysica Acta (BBA) - Biophysics including Photosynthesis, 1966
Abstract The accelerating effect of leucine on the transintestinal transport of lysine has been studied. The relationship of the transport of lysine to that of leucine was such as would be expected if the accelerating effect of leucine was a result of the combined function of the transport mechanisms of the neutral and the diamino acids.
openaire   +2 more sources

An experimental Ramachandran plot for retropeptide derivatives: Conformational features of derivatives of GEM-diamino and malonyl amino acids

Biopolymers, 1998
Malonic and diaminomethane residues, equivalent to the two possible retro modifications of a glycine unit, with an inverted peptide group, present particular conformations that differ from those found in glycine and, in general, in α-amino acids. In both cases the φi and ψi torsional angles have restricted values as deduced from inspection of the ...
Jordi Puiggalí, Juan A. Subirana
openaire   +1 more source

A novel method for the transformation of acyclic α,ω-diamino acids to cyclic unsaturated α-amino acids using anodic oxidation

J. Chem. Soc., Chem. Commun., 1983
The acyclic α,ω-diamino acids, L-ornithine and L-lysine, were transformed to optically pure cyclic α′,β′-unsaturated α-amino acids using anodic oxidation as the key step.
Tatsuya Shono, Yoshihiro Matsumura, Kenji Inoue   +2 more
openaire   +1 more source

Bioisosteric replacement of the .alpha.-amino carboxylic acid functionality in 2-amino-5-phosphonopentanoic acid yields unique 3,4-diamino-3-cyclobutene-1,2-dione containing NMDA antagonists

Journal of Medicinal Chemistry, 1992
In this report, a novel bioisostere of the alpha-amino acid, 3,4-diamino-3-cyclobutene-1,2-dione, has been incorporated into a series of compounds which are NMDA antagonists. These compounds, which are achiral and easily prepared, demonstrated good affinity at the NMDA receptor by their ability to displace [3H]CPP binding in vitro.
W A, Kinney, N E, Lee, D T, Garrison, E J, Podlesny, J T, Simmonds, D, Bramlett, R R, Notvest, D M, Kowal, R P, Tasse   +8 more
openaire   +2 more sources

ChemInform Abstract: Chemoenzymatic Synthesis of (3R,5R)‐3,6‐Diamino‐5‐hydroxyhexanoic Acid (X), the Amino Acid Moiety of (+)‐Negamycin (XI).

ChemInform, 1997
AbstractChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.
J. JANG, Y. LEE, Y. AHN
openaire   +1 more source

ChemInform Abstract: Synthesis of 1,4‐Diamino‐2‐methoxyanthraquinone Starting from 1‐Amino‐ 4‐bromoanthraquinonesulfonic Acid.

ChemInform, 1991
AbstractChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.
S. A. KONDRATOV, YA. B. SHTEINBERG, S. M. SHEIN   +2 more
openaire   +1 more source

ChemInform Abstract: SYNTHESIS OF CHIRAL N‐ AND N,N′‐SUBSTITUTED DIAMINES AND DIAMINO ALCOHOLS FROM AMINO ACIDS

Chemischer Informationsdienst, 1983
Abstract(R)‐Phenylglycin (I) wird nach Acylierung zu (II) über die Stufe der Hydrazide (III) in Azide (IV) übergeführt, die mit Aminen zu Diamiden (V) umgesetzt werden.
G. BUONO, C. TRIANTAPHYLIDES, G. PEIFFER, F. PETIT   +3 more
openaire   +1 more source