Synthesis and biological activity of peptide antagonists of luliberin (luteinizing hormone-releasing hormone)
作者:G. W. Moersch、M. C. Rebstock、E. L. Wittle、F. J. Tinney、E. D. Nicolaides、M. P. Hutt、T. F. Mich、J. M. Vandenbelt、R. E. Edgren
DOI:10.1021/jm00194a010
日期:1979.8
analogues of luliberin (luteinizing hormone-releasing hormone) with modifications in the 1 and 6 positions, and in some instances the 10 position, has been prepared. Some of these analogues are potent inhibitors of luliberin in vitro and in vivo. The use of ultraviolet absorption measurements for evaluating peptides containing tyrosine and tryptophan is described. An efficient synthesis of O-methyl-d-tyrosine
[EN] HETEROCYCLIC DERIVATIVES AND THEIR USE AS ANTITHROMBOTIC AGENTS<br/>[FR] DERIVES HETEROCYCLIQUES ET LEUR UTILISATION EN TANT QU'AGENTS ANTITHROMBOTIQUES
申请人:AKZO NOBEL N.V.
公开号:WO1998047876A1
公开(公告)日:1998-10-29
(EN) The present invention relates to antithrombotic compounds comprising the group Q, Q having formula (I), wherein the substructure (i) is a structure selected from (a, b and c), wherein X is O or S; X' being independently CH or N; and m is 0, 1, 2 or 3; wherein the group Q is bound through an oxygen atom or an optionally substituted nitrogen or carbon atom, or a pharmaceutically acceptable salt thereof or a prodrug thereof. The compounds of the invention are therapeutically active and in particular are antithrombotic agents.(FR) La présente invention concerne des composé antithrombotiques comprenant le groupe Q correspondant à la formule (I) dans laquelle la sous-structure (i) est une structure choisie parmi (a), (b) ou (c) où X représente O ou S, X' représente indépendamment CH ou N, et m vaut 0, 1, 2 ou 3, le groupe Q étant fixé au moyen d'un atome d'oxygène ou d'un atome de carbone ou d'azote éventuellement substitué. L'invention concerne également un sel ou un promédicament de ces composés, acceptable sur le plan pharmacologique. Les compositions de l'invention sont actives sur le plan thérapeutique et constituent notamment des agents antithrombotiques.
Empirical rules for the enantiopreference of lipase from Aspergillus niger toward secondary alcohols and carboxylic acids, especially α-amino acids
作者:Lana E. Janes、Romas J. Kazlauskas
DOI:10.1016/s0957-4166(97)00524-7
日期:1997.11
Lipase from Aspergillus niger (ANL, Amano lipase AP) catalyzes enantioselective hydrolysis and acylation reactions. To aid in the design of new applications of this lipase, we propose two empirical rules that predict which enantiomer reacts faster. For secondary alcohols, a rule proposed previously for other lipases also works for ANL, but with lower reliability (77%, 37 of 48 examples). For carboxylic acids, we examined both crude and partially-purified ANL because commercial ANL contains contaminating hydrolases. Partial purification removed a contaminating amidase and increased the enantioselectivity of ANL toward many alpha-amino acids, including cyclic amino acids. Unlike other lipases, ANL readily accepts positively-charged substrates and shows the highest enantioselectivity toward alpha-amino acids. Although a rule based on the sizes of the substituents could not predict the fast-reacting enantiomer, a rule limited to alpha-amino acids did predict the fast-reacting enantiomer. We estimate that the charged alpha-amino group contributes a factor of 40-100 (Delta Delta G double dagger=2.2-2.7 kcal/mol) to the enantioselectivity of ANL towards carboxylic acids. (C) 1997 Elsevier Science Ltd.
HETEROCYCLIC DERIVATIVES AND THEIR USE AS ANTITHROMBOTIC AGENTS