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  • Alkylthiolation  (2)
  • Human effector mechanisms  (1)
  • Keywords. Diastereospecificity; HIV-Protease; Peptidomimetica; Statine.  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Monatshefte für Chemie 115 (1984), S. 1121-1123 
    ISSN: 1434-4475
    Keywords: Alkylthiolation ; Alkyl 4-methylbenzenethiosulfonates
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Enolates of arylalkylketones can be α-alkylthiolated in high yields by reaction with S-Alkyl 4-Methylbenzenethiosulfonates.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1434-4475
    Keywords: Keywords. Diastereospecificity; HIV-Protease; Peptidomimetica; Statine.
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung.  2-Aminobenzylsubstituierte 4-Amino-3-hydroxy-5-phenyl-pentansäure (AHPPA) bildet das zentrale strukturelle Element von hochaktiven HIV-Proteaseinhibitoren. Um Derivate mit reduzierter konformeller Flexibilität, zu erhalten, stabilisierten wir AHPPA durch Ringbildung wie folgt: AHPPA wird mit 1,1′-Carbonyldiimidazol zu sechsgliedrigen Harnstoffen zyklisiert. Umsatz von AHPPA mit Chloracetylchlorid ergibt 1,4-Diazepan-2-on, wohingegen BOC-geschütztes AHPPA in einem Zweistufenprozess zu 7(S)-Benzyl-6-chloro-4-(4-methoxybenzyl)-2-oxo-[1,4]-diazepane-5(S)-carbonsäureethylester führt, wahrscheinlich durch transanulare Einflüsse des Stickstoffs in Position 4 begünstigt. TBDMS-Schutzgruppenstrategie erlaubt die Zyklisierung von Aminobenzylsubstituiertem 4-Amino-3-hydroxy-5-phenylpentanal zu 7(R)-Benzyl-6(S)-hydroxy-5(R)-hydroxymethyl-4-(4-methoxybenzyl)-(1,4)-diazepan-2-on und 4(R)-Benzyl-5(S)-hydroxy-6(R)-hydroxymethyl-1-(4-methoxybenzyl)-tetrahydro-pyrimidino-2-on. 3(R)-(7(R)-Benzyl-6(S)-hydroxy-4-(4-methoxybenzyl)-2-oxo-[1,4]-diazepan-5-yl)-acrylsäureethylester zeigte in dieser Serie mit einem Ki-Wert von etwa 600nM die beste Wirksamkeit gegen HIV-Protease.
    Notes: Summary.  2-Aminobenzyl substituted 4-amino-3-hydroxy-5-phenyl pentanoic acid (AHPPA) is the central structural element of highly active HIV-protease inhibitors. To obtain conformationally less flexible statine analogs, we stabilized AHPPA via ring formations, e.g. by reaction with 1,1′-carbonyl diimidazole to give six-membered ureas. Reaction of AHPPA with chloroacetyl chloride leads to 1,4-diazepan-2-ones, whereas BOC protected AHPPA is transformed in a two step sequence to 7(S)-benzyl-6-chloro-4-(4-methoxybenzyl)-2-oxo-[1,4]-diazepane-5(S)-carboxylic acid ethylester, likely assisted by transannular influence of N-4. TBDMS protection strategy allows the cyclization of 2-aminobenzyl substituted 4-amino-3-hydroxy-5-phenylpentanal to 7(R)-benzyl-6(S)-hydroxy-5(R)-hydromethyl-4-(4-methoxybenzyl)-(1,4)-diazepan-2-one and 4(R)-benzyl-5(S)-hydroxy-6(R)-hydroxymethyl-1-(4-methoxybenzyl)-tetrahydro-pyrimidino-2-one. In this way, backbone stabilized peptidomimetics containing statine-like structural elements are obtained. 3(R)-(7(R)-Benzyl-6(S)-hydroxy-4-(4-methoxybenzyl)-2-oxo-[1,4]-diazepan-5-yl)-acrylic acid ethylester showed the highest activity against HIV-protease in this series with a Ki value of about 600 nM.
    Type of Medium: Electronic Resource
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  • 3
    ISSN: 1432-0851
    Keywords: Y oligosaccharide antigen ; mAb isotype variants ; Human effector mechanisms
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary The capacity of isotype variants of BR55-2, an anti-tumor monoclonal antibody directed against Y oligosaccharide, to mediate antibody-dependent cellular cytotoxicity (ADCC) and complement-dependent cytotoxicity (CDC) in the human system was evaluated using freshly isolated peripheral blood mononuclear cells, lymphocytes, monocytes and complement. The ADCC activities of the BR55-2 IgG3 isotype and its switch variants (IgG1, IgG2b, and IgG2a) with human monocytes were high for all isotypes, whereas the activity of all isotypes was lower with freshly isolated lymphocytes, IgG1 being the least effective. The CDC on the other hand was strong with IgG3, IgG2b and IgG2a and negative with the IgG1 variant. The IgG3 and IgG2a isotypes were selected for further development. Their strong ADCC and CDC activity against mammary carcinoma, colon carcinoma and small-cell lung tumor cell lines was confirmed quantitatively using proteins highly purified from tissue-culture supernatants. Significant variations in ADCC and CDC competence was observed among human donors.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Monatshefte für Chemie 115 (1984), S. 655-657 
    ISSN: 1434-4475
    Keywords: Alkylthiolation ; Enamines ; Alkyl 4-methylbenzenethiosulfonates
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Enamines of cyclic ketones were α-alkylthiolated in good yields by simply refluxing them with alkyl 4-methylbenzenethiosulfonates and triethylamine in acetonitrile.
    Type of Medium: Electronic Resource
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