86937-80-6Relevant articles and documents
Cyclic side-chain-linked opioid analogs utilizing cis- and trans-4-aminocyclohexyl-d-alanine
Piekielna, Justyna,Gentilucci, Luca,De Marco, Rossella,Perlikowska, Renata,Adamska, Anna,Olczak, Jacek,Mazur, Marzena,Artali, Roberto,Modranka, Jakub,Janecki, Tomasz,T?mb?ly, Csaba,Janecka, Anna
, p. 6545 - 6551 (2015/02/19)
Cyclization of linear sequences is a well recognized tool in opioid peptide chemistry for generating analogs with improved bioactivities. Cyclization can be achieved through various bridging bonds between peptide ends or side-chains. In our earlier paper we have reported the synthesis and biological activity of a cyclic peptide, Tyr-c[d-Lys-Phe-Phe-Asp]NH2 (1), which can be viewed as an analog of endomorphin-2 (EM-2, Tyr-Pro-Phe-Phe-NH2). Cyclization was achieved through an amide bond between side-chains of d-Lys and Asp residues. Here, to increase rigidity of the cyclic structure, we replaced d-Lys with cis- or trans-4-aminocyclohexyl-d-alanine (d-ACAla). Two sets of analogs incorporating either Tyr or Dmt (2′,6′-dimethyltyrosine) residues in position 1 were synthesized. In the binding studies the analog incorporating Dmt and trans-d-ACAla showed high affinity for both, μ- and δ-opioid receptors (MOR and DOR, respectively) and moderate affinity for the κ-opioid receptor (KOR), while analog with Dmt and cis-d-ACAla was exceptionally MOR-selective. Conformational analyses by NMR and molecular docking studies have been performed to investigate the molecular structural features responsible for the noteworthy MOR selectivity.
Aniline derivatives possessing an inhibitory effect of nitric oxide synthase
-
, (2008/06/13)
Compounds represented by the general formula (1): ? (where R1is SR6or NR7R8, where R6is typically an alkyl group having 1-6 carbon atoms, R7is a hydrogen atom, an alkyl group having 1-6 carbon atoms or a nitro group, and R8is a hydrogen atom or an alkyl group having 1-6 carbon atoms; R2and R3are each typically a hydrogen atom or an alkyl group having 1-6 carbon atoms; R4is a hydrogen atom, an alkyl group having 1-6 carbon atoms or an amidino group of which the amine portion may be substituted by an alkyl or nitro group; R5is a hydrogen atom or an alkyl group having 1-6 carbon atoms; Y1, Y2, Y3and Y4which may be the same or different are each typically a hydrogen atom, a halogen atom or an alkoxy group having 1-6 carbon atoms; n and m are each an integer of 0 or 1), or possible stereoisomers or optically active forms of the compounds or pharmaceutically acceptable salts thereof. The compounds possess a potent nitric oxide synthase inhibiting activity and are useful as therapeutics of cerebrovascular diseases.
SYNTHESIS OF cis AND trans-4-AMINOCYCLOHEXYL-D-ALANINE DERIVATIVES AND DETERMINATION OF THEIR STEREOCHEMISTRY
Rao, Pemmaraju N.,Peterson, Dorothy M.,Acosta, C. Kirk,Bahr, Martin L.,Kim, Hyun K.
, p. 103 - 110 (2007/10/03)
-