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  • 1
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1983 (1983), S. 1668-1688 
    ISSN: 0170-2041
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Asymmetrische Synthese von α-substituierten Aminosäuren und Aminen durch Kohlenstoff - Kohlenstoff-Verknüpfung in α-Stellung zum StickstoffBeschrieben wird die asymmetrische Synthese von α-substituierten α-Aminosäuren und Propargylaminen. Als chiralen Hilfsstoff benutzen wir (S)-(-)-1-Dimethoxymethyl-2-methoxymethyl-pyrrolidin (SDMP, 1). Die Aminosäuren und Amine werden mit SDMP 1 in die entsprechenden Amidine C übergeführt. Metallierung und Alkylierung ergibt die Produkte D, welche zu den gewünschten α-substituierten Aminosäuren 20 und Propargylaminen 22 hydrolysiert werden. Die Methode erlaubt die enantioselektive Alkylierung von Aminosäuren und Propargylaminen mit zufriedenstellenden chemischen Ausbeuten und genügender bis guter Enantioselektivität. Der chirale Hilfsstoff SDMP 1 wird aus (S)-Prolin in 4 Stufen hergestellt.
    Notes: The asymmetric synthesis of α-substituted α-amino acids and propargylamines is described. As chiral auxiliary we used (S)-(-)-1-dimethoxymethyl-2-methoxymethylpyrrolidine (SDMP, 1). Treatment of the amino acids or amines with SDMP 1 afforded the corresponding amidines C, which can be metalated and alkylated to yield the products D, which were hydrolyzed to give the desired α-substituted α-amino acids 20 and propargylamines 22. The method allows the enantioselective alkylation of amino acids and propargylamines in satisfactory chemical yields and fair to good enantioselectivity. The chiral auxiliary SDMP 1 is prepared from (S)-proline in 4 steps.
    Additional Material: 4 Tab.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1985 (1985), S. 1036-1040 
    ISSN: 0170-2041
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Synthese von 5′-[(3-Aminooxypropyl)amino]-5′-desoxyadenosinDie Synthese der Titelverbindung 2 wird beschrieben. N-Alkylierung von 5′-Amino-5′desoxy-2′,3′-O-(1-methylethyliden)adenosin (3) mit [(3-Iodpropoxy)methyl]benzol gab nach Entfernung der Benzylgruppe das 5′-Desoxyadenosin-Derivat 4b. Nach Schützen der NH-Gruppe an C-5′ konnte die terminale OH-Gruppe mit Triphenylphosphan, Diethyl-azodicarboxylat und N-Hydroxyphthalimid umgesetzt werden. Man erhält einen vollständig geschützten Vorläufer von 2, der nach Behandlung mit Hydrazinhydrat und Schwefelsäure die Zielsubstanz 2 als Sesquisulfat ergibt.
    Notes: The synthesis of the title compound 2 is described. N-Alkylation of 5′-amino-5′-deoxy-2′,3′-O-(1-methylethylidene)adenosine (3) with [(3-iodopropoxy)methyl]benzene gave after debenzylation the 5′-deoxyadenosine derivative 4b. After derivatization of the 5′-NH, the terminal hydroxy group was reacted with triphenylphosphane, diethyl azodicarboxylate, and N-hydroxyphthalimide to yield a full protected derivative of 2. Sequential deprotection (H2NNH2, then H2SO4) afforded the target molecule 2 as its sesquisulfate salt.
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  • 3
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1989 (1989), S. 171-175 
    ISSN: 0170-2041
    Keywords: Carbon oxygenation ; Epoxidation ; Manganese(IV) porphyrins ; Monooxygenase model ; Nitridomanganese(V) porphyrins ; Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Cytochrome P-450 Model Reactions. - Isolation and Characterization of Manganese(IV)- and Manganese(V)-Porphyrin ComplexesThe isolation at  -  78°C and characterization of the crystalline reactive Mn(IV)-phorphyrin complex TDCPPMn(IV)(C6H5IOCl)2 (3) is described. 3 is compared with the also synthesized manganese-phorphyrin complexes TDCPPMn(IV)(OCH3)2 (4) and TDCPPMn(V)N (5). The stoichiometric reaction of 3 with triphenylphosphine yields 2.5 equivalents of triphenylphosphine oxide, 1.0 equivalent of TDCPPMn(III)Cl (2), and 2.0 equivalents of iodobenzene. Olefins are epoxidized and cyclohexane is oxygenated by 3. With NH3, 3 reacts to the Mn(V)-nitrido complex TDCPPMn(V)N (5). Oxygenation reactions of the system TDCPPMn(III)Cl (2)/PhIO are described.
    Notes: Die Isolierung bei  -  78°C und Charakterisierung des kristallinen reaktiven Mn(IV)-Porphyrin-Komplexes TDCPPMn(IV)(C6H5-IOCl)2 (3) wird beschrieben. 3 wird mit den ebenfalls dargestellten Mangan-Porphyrin-Komplexen TDCPPMn(IV)(OCH3)2 (4) und TDCPPMn(V)N (5) verglichen. Die stöchiometrische Umsetzung von 3 mit Triphenylphosphan führt zu 2.5 Äquivalenten Triphenylphosphanoxid, 1.0 Äquivalent TDCPPMn(III)Cl (2) und 2.0 Äquivalenten Iodbenzol. Olefine werden von 3 epoxidiert und Cyclohexan wird von 3 oxygeniert. Mit NH3 reagiert 3 zu dem Mn(V)-Nitrido-Komplex TDCPPMn(V)N (5). Oxygenierungsreaktionen des Systems TDCPPMn(III)Cl (2)/PhIO werden beschrieben.
    Additional Material: 3 Tab.
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  • 4
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 683 (1965), S. 216-224 
    ISSN: 0075-4617
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Cbo-aminosäure-4-[4-chlor-phenylazo]-phenylester (I) reagieren mit Aminosäureäthylestern zu N-geschützten Dipeptidäthylestern (II). Die Decarbobenzoxylierung von I mit Bromwasserstoff/Eisessig ergibt in nahezu quantitativer Ausbeute Aminosäure-4-[4-chlor-phenylazo]-phenylester-hydrobromide (III), die über Cbo-dipeptid-4-[4-chlor-phenylazo]-phenylester (IV) zu geschützten Tripeptid-Derivaten (V) umgesetzt werden.
    Additional Material: 4 Tab.
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  • 5
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 130 (1864), S. 346-354 
    ISSN: 0075-4617
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 152 (1869), S. 91-95 
    ISSN: 0075-4617
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 154 (1870), S. 356-367 
    ISSN: 0075-4617
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 156 (1870), S. 93-102 
    ISSN: 0075-4617
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 9
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 159 (1871), S. 217-230 
    ISSN: 0075-4617
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 10
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 159 (1871), S. 230-240 
    ISSN: 0075-4617
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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