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  • 1
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 110 (1977), S. 2872-2879 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: The Reaction of 2-Alkyl-3-aminoacroleins with Phenyl Isocyanate, Phenyl-and Benzoyl Isothiocyanate2-Alkyl-3-aminoacroleins 2 add to phenyl isocyanate (1) to yield N-(phenylcarbamoyl)-2-alkyl-3-aminoacroleins [2-alkyl-3-(3-phenylureido)acroleins] 3. With phenyl isothiocyanate (4) the reaction does not lead to the analogous thioureas, but to 5-alkyl-1-phenylpyrimidin-2(1H)-thiones 6. Their constitution is mainly determined on the basis of their 13C n. m. r. spectra. Reaction of benzoyl isothiocyanate (8) with 2 results in elimination of the benzoyl group as benzoic acid and formation of the 5-alkyl-2-mercaptopyrimidines 10, which have already been described in the literature.
    Notes: 2-Alkyl-3-aminoacroleine 2 werden an Phenylisocyanat (1) unter Bildung von N-(Phenylcarbamoyl)-2-alkyl-3-aminoacroleinen [2-Alkyl-3-(3-phenylureido)acroleinen] 3 addiert. Mit Phenylisothiocyanat (4) entstehen dagegen nicht die Thioharnstoffe, sondern 5-Alkyl-1-phenylpyrimidin-2(1H)-thione 6, deren Konstitution hauptsächlich aufgrund der 13C-NMR-Spektren gesichert wird. Benzoylisothiocyanat (8) reagiert mit 2 unter Abspaltung der Benzoylgruppe als Benzoesäure zu den bereits beschriebenen 5-Alkyl-2-mercaptopyrimidinen 10.
    Additional Material: 3 Tab.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Heterocyclic β-Enamino Esters, 311). Novel 6:7-, 6:8, and 5:6:7-Combinations of Heterocondensed Pyrimidines from Iminophosphoranes of Heterocyclic β-Enamino Esters. - Stable Heterocyclic YlidesWith acetylenic esters the (5-azolylimino)triphenylphosphoranes 10a - d do not show any cyclo-addition tendency, while the (2-thienylimino)triphenylphosphoranes 8a, b yield the stable ylids 13a, b. By treatment with phenyl isocyanate the iminophosphoranes 16a - m, 17, and 18a, b afford the carbodiimides 19a - m, 20, and 21a, b; however, 10b - d give the O-ethylisoureas 24b - d. 19a, b, e, f, h are transformed in aqueous ethanol into 6:7-bicycles, namely into oxepino[2,3-d]pyrimidines 25a, b, e, f, h. With isopropylamine the 2-isopropylamino-6:7-bicycles 31a - c, e - h are formed analogously, while in the case of thiocin 21a the 6:8-bicycle 34 is obtained. The salts 33f, g are formed by treating 19f, g or 25f with aqueous diethylamine. Accordingly, 2-aminoethanol, 3-aminopropanol, and ethylenediamine react with 19a, b, f, l to afford the 2-hydroxy- and 2-aminoalkyl-6:7-bicycles 36a - f; by treatment with hydrazine the 2-hydrazinooxepino- and -thiepino[2,3-d]pyrimidines 38a - h and 39 are obtained, which are converted with functional C1-units into 5:6:7-tricycles 43a - d, 45'a, b.
    Notes: Die (5-Azolylimino)triphenylphosphorane 10a - d zeigen mit Acetylendicarbonsäureestern keine Tendenz zur Cycloaddition, während die (2-Thienylimino)triphenylphosphorane 8a, b, zu den stabilen Yliden 13a, b reagieren. Mit Phenylisocyanat ergeben die Iminophosphorane 16a - m, 17 und 18a, b die Carbodiimide 19a - m, 20 und 21a, b; 10b - d liefern statt dessen die O-Ethylisoharnstoffe 24b - d. In wäßrigem Ethanol werden 19a, b, e, f, h in 6:7-Bicyclen, nämlich in die Oxepino[2,3-d]pyrimidine 25a, b, e, f, h umgewandelt. Mit Isopropylamin bilden sich die 2-Isopropylamino-6:7-Bicyclen 31a - c, e - h und im Fall des Thiocins 21a der 6:8-Bicyclus 34. Die Salze 33f, g entstehen durch Einwirkung von wäßrigem Diethylamin auf 19f, g bzw. auf 25f. 2-Aminoethanol, 3-Aminopropanol und Ethylendiamin ergeben mit 19a, b, f. l analog die 2-Hydroxy- und 2-Aminoalkyl-6:7-Bicyclen 36a - f; mit Hydrazin werden die 2-Hydrazinooxepino- und -thiepino[2,3-d]pyrimidine 38a - h und 39 erhalten, die mit funktionellen C1-Bausteinen zu den 5:6:7-Tricyclen 43a - d, 45'a, b führen.
    Additional Material: 24 Tab.
    Type of Medium: Electronic Resource
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  • 3
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Heterocyclic-β-Enamino Esters, 30 -, Synthesis and Cycloaddition-Ring Expansion Sequence of Iminophosphoranes of Heterocyclic β-Enamino Esters: 6,7-Dihydrooxepins,-thiepins, and 3,4-Dihydro-2H-thiocinsThe heterocyclic β-enamino esters 1a - d, 2a - c, 5, and 6 react in the system triphenylphosphane/hexachloroethane/triethylamine in high yields to afford the resonance-stabilized iminophosphoranes 3a - d, 4a - c, 7, and 8. Alkyl iodides attack the electron-rich C-β in 3a - d; the phosphonium salts 11a - h thus obtained split with alkaline into the imines 12a - h. With acetylenecarboxylic esters in a cycloaddition-ring expansion sequence from 3a - d, 4a - c, 7, and 8 dihydrooxepins 14a - h, 15a - c, e - g, dihydrothiepins 16a, b, and dihydro-2H-thiocins 17a, b,
    Notes: Die heterocyclischen β-Enaminoester 1a - d, 2a - c, 5 und 6 reagieren im System Triphenylphosphan/Hexachlorethan/Triethylamin in hohen Ausbeuten zu den resonanzstabilisierten Iminophosphoranen 3a - d, 4a - c, 7 und 8. Alkyliodide greifen in 3a - d am elektronenreichen C-β an; die so erhaltenen Phosphoniumsalze 11a - h spalten mit Alkali zu den Iminen 12a - h. Mit Acetylencarbonsäureestern entstehen aus 3a - d, 4a - c, 7 und 8 in hohen Ausbeuten in einer Cycloadditions-Ringerweiterungs-Sequenz Dihydrooxepine 14a - h, 15a - c, e - g, Dihydrothiepine 16a, b, bzw. Dihydro-2H-thiocine 17a, b. Säurekatalysierte Hydrolyse von 14c, d ergibt die Enaminoester 19a, b.
    Additional Material: 8 Tab.
    Type of Medium: Electronic Resource
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