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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Monatshefte für Chemie 108 (1977), S. 257-263 
    ISSN: 1434-4475
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Tetrahydro-6-hydroxy-4,4,6-trimethyl-1,3-thiazine-2-thione (1 a) reacts with methyl-, ethyl- and n-butylamine to the corresponding 1-alkyl-6-alkylaminotetrahydro-2(1H)-pyrimidinethione12 but withi-propylamine to tetrahydro-6-isopropylamino-1,3-thiazine-2-thione (6 d). On treatment withDCC,6 d is rearranged to dihydro-4-isopropylamino-2(1H)-pyridinethione (8 d), and 6-amino-tetrahydro-1,3-thiazinethione (6 a) to dihydro-4,4,6-trimethyl-2(1H)-pyrimidinethione (10 a). The reaction of 6-aminothiazinethiones6 a, d and 6-(4-morpholinyl)-thiazinethione13 resp., with methylamine leads to 1-methyl-6-methylamino-pyridinethione12 b. 1-Alkyl-6-alkylamino-tetrahydro-2(1H)-pyrimidinethiones (12) react at reflux temperature to dihydro-1-alkylpyrimidinethiones10. With methylamine only 6-methylamino-3,4,4,6-tetramethyl-1,3-thiazine-2-thione (6 f) is formed from tetrahydro-6-hydroxy-tetramethyl-1,3-thiazine-2-thione (1 b).
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Monatshefte für Chemie 126 (1995), S. 1367-1374 
    ISSN: 1434-4475
    Keywords: Dihydropyridine-2(1H)-thiones ; Dihydrothiopyran-4-amines ; 1-Phenyl-2,3-dihydro-4(1H)-pyridinones ; Tetrahydropyridiniumiodides
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung 6-Phenylimino-3,6-dihydro-2H-thiopyran-4-amine (1) wurden in 1-Phenyl-5,6-dihydropyridin-2(1H)-thione (3) umgewandelt. Diese wurden alkyliert und zu 6-Methylthio-1-phenyl-2,3-dihydro-4(1H)-pyridinonen (5) hydrolysiert. Zuletzt gelangte man durch selektives Entfernen der Methylthiogruppe mitRaney-Nickel zu den Titelverbindungen6. Die relativen Konfigurationen der gebildeten diastereomeren Dihydropyridinone wurden durch NOE-Messungen aufgeklärt.
    Notes: Summary 6-Phenylimino-3,6-dihydro-2H-thiopyran-4-amines (1) were converted to 1-phenyl-5,6-dihydropyridine-2(1H)-thiones (3). Those were akylated and hydrolyzed, thus yielding 6-methylthio-1-phenyl-2,3-dihydro-4(1H)-pyridinones (5). Finally, the methylthio group was removed withRaney nickel giving the title compounds6. The relative configurations of the formed diastereoisomeric dihydropyridinones have been investigated by NOE measurements.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Monatshefte für Chemie 127 (1996), S. 1027-1030 
    ISSN: 1434-4475
    Keywords: [C-C-C-C]+[S]-addition ; 3-Amino-2,4-pentadienthioamide ; 3-Amino-2,4-heptadienthiomaide ; 3-Aminothiophene-2-thioamide ; 2H-Thiopyran-4(3H)-iminiumiodides
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung 4-Dimethylamino-5,6-dihydro-2H-thiopyran-2-thione (1) wurden zu N,N-Dimethyl-6-methylthio-2H-thiopyran-4(3H)-iminiumiodiden(2) alkyliert. Die Umsetzung mit Ammoniak führte zur Bildung von 6-Dimethylamino-2H-thiopyran-4(3H)-iminiumiodiden (3). Diese wurden zu 3-Amino-N,N-dimethyl-2,4-pentadienthioamiden (4) hydrolysiert. Beim Erhitzen mit Schwefel erfolgte Cyclisierung zu 3-Aminothiophen-2-thiocarboxamiden (5). Die Konfiguration der Pentadienthioamide (4) wurde mit NOE-Messungen untersucht, die der Thiophen-2-thiocarboxamide (5) mit Hilfe zweidimensionaler NMR-Methoden aufgeklärt.
    Notes: Summary 4-Dimethylamino-5,6-dihydro-2H-thiopyran-2-thiones (1) were alkylated to N,N-dimethyl-6-methylthio-2H-thiopyran-4(3H)-iminiumiodides (2). Aminolysis of the latter with ammonia led to 6-dimethylamino-2H-thiopyran-4(3H)-iminiumiodides (3) which were hydrolyzed to 3-amino-N,N-dimethyl-2,4-pentadienthioamides (4). Ring closure with sulfur gave 3-aminothiophene-2-thioamides (5). The configurations of the pentadienthioamides (4) have been investigated by NOE experiments. The structures of the thiophene-2-thioamides (5) were established by means of two-dimensional NMR techniques.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Monatshefte für Chemie 107 (1976), S. 1361-1367 
    ISSN: 1434-4475
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The rearrangement of 1-alkyl- and 1-aryldihydro-6-methyl-2(1H)-pyrimidinethiones (1 a) or-ones (1 b) and of methylene compounds (2a, 2b) resp., to 4-alkylamino- and 4-arylaminodihydro-2(1H)-pyridinethiones (4 a) or-ones (4 b) takes place via the corresponding 3-alkylamino- and 3-aryl-amino-3-butenylisothiocyanates (3 a) or-isocyanates (3 b). Dialkylamino-dihydro-2(1H)-pyridinethiones (10) are formed by heating dihydro-6-methyl-2(1H)-pyrimidinethiones (6 a) and 3,4-dihydro-6-methyl-1,3-thiazin-2-thiones (6 b) with dialkylformamides and by the reaction of secondary amines with tetrahydro-6-hydroxy-6-methyl-1,3-thiazin-2-thiones (5 a), with N,N-dialkyl-N′-(3-oxobutyl)-thioureas (7) and 3-oxobutyl isothiocyanates (8). A general method for the preparation of10 is the reaction of dialkylammoniumrhodanides12, N,N-dialkylthioureas13 and dialkylammonium chlorides and KCNS, resp., with 3-alken-2-ones14 and 4-hydroxy-2-alkanones15, resp. Methyl ketones such as acetone, which readily undergo the aldol condensation, behave analogously. The reactions described take place via the intermediate aminoalkenyl isothiocyanates (9).
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Springer
    Monatshefte für Chemie 108 (1977), S. 243-255 
    ISSN: 1434-4475
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Tetrahydro-6-hydroxy-trimethyl-1,3-thiazine-2-thione (1) reacts with secondary amines via the dialkylammonium-3-oxoalkyldithiocarbamate3, either via isothiocyanates6 to 4-dialkylaminodihydro-2(1H)-pyridinethiones7 or to dialkylammonium dithiocarbamates (13), depending on the amine used and the reaction conditions. Subsequently, 6-dialkylaminotetrahydro-1,3-thiazine-2-thiones11 or tetrahydro-6-mercapto-1,3-thiazine-2-thione10 are formed. On being heated to reflux,11 reacts to pyridinethione7 and 4-dialkylaminodihydrothiopyranthione19. With secondary amines only13 is formed from tetrahydro-6-hydroxytetramethyl-1,3-thiazine-2-thione20. The reaction of dihydrotrimethyl-1,3-thiazine-2-thione21 with secondary amines leads to N,N-dialkylthioureas16 or dialkylammonium thiocyanates17 and with dialkylformamides 4-dialkylaminodihydropyridinethiones7 are formed. Dihydrotetramethyl-1,3-thiazine-2-thione24 reacts neither with secondary amines nor with dialkylformamides.
    Type of Medium: Electronic Resource
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  • 6
    ISSN: 1434-4475
    Keywords: [C-C-C]+[N-O]-addition ; 1,2-Oxazoles ; 13C NMR data ; fragmentation pattern ; MS-data
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary 3-Amino-2,4-pentadienthioamides, which were obtained from 6-dialkylamino-2H-thiopyrane-4(3H)iminium halides by alkali hydrolysis, react with hydroxylamine hydrochloride in a [C-C-C] + [N-O]-addition to give selectively 5-amino-3-alkenyl-1,2-oxazoles. These oxazoles have been identified by13C and1H NMR spectroscopic analysis. The configuration of these compounds was established on the basis of the coupling constants and 2D-NOESY-experiments. The position of the substituents has been determined by analysis of the fragmentation pattern.
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  • 7
    ISSN: 0044-2313
    Keywords: Phthalocyaninates ; indium compounds ; optical spectra ; vibrational spectra ; crystal structure ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Preparation and Properties of Phthalocyaninato(2-)indates(III) with Bidentate Oxo Ligands; Crystal Structure of Tetra(n-butyl)ammonium Carbonato(O,O′)phthalocyaninato(2-)indate(III)Tetra(n-butyl)ammonium acidophthalocyaninato(2-)indate(III) of selected bidentate dioxo ligands (oxalate, catecholate, sulfate and carbonate) are obtained by the reaction of tetra(n-butyl)ammonium cis-dihydroxophthalocyaninato(2-)indate(III) with oxalic acid, catechol, hydrogensulfate and ammonium carbaminate. The carbonato complex crystallizes monoclinic in the space group P21/c (No. 14). InIII is hexa-coordinated by four isoindole nitrogen atoms (Niso) and two oxygen atoms of the carbonate in a cis arrangement. InIII is directed out of the centre (Ct) of the (Niso)4 plane towards the carbonate ligand (d(In-Ct)) = 0.903(1) Å. The averaged (In-Niso) and (In-O) distance is 2.1865(4) and 2.1585(5) Å, the (O-In-O′) angle 60.1(2)°. The phthalocyaninate(2-) ligand (pc2-) is in a concave distortion. The optical spectra show the typical π-π* transition of the pc2- ligand at 14600 (B region), 28000 (Q), 35000 (N) und 40500 cm-1 (L). In the IR spectra, the internal vibrations of the oxalate, sulfate and carbonate ligand and the asymmetric (In-O) stretching vibrations are well separated from the internal vibrations of the pc2- skeleton. Spectra-structure correlations are discussed.
    Notes: Tetra(n-butyl)ammoniumacidophthalocyaninato(2-)indate(III) ausgewählter zweizähniger Dioxo-Acidoliganden wie Oxalat, Katecholat, Sulfat und Carbonat werden durch die Reaktion von Tetra(n-butyl)ammoniumcis-dihydroxophthalocyaninato(2-)indat(III) mit Oxalsäure, Brenzkatechin, Hydrogensulfat und Ammoniumcarbaminat dargestellt. Der Carbonat-Komplex kristallisiert monoklin in der Raumgruppe P21/c (Nr. 14). Hexakoordiniertes InIII ist von den vier Isoindol-Stickstoffatomen (Niso) und zwei Sauerstoffatomen des Carbonats in cis-Anordnung umgeben. InIII ist aus dem Zentrum (Ct) der Ebene der vier Niso- Atome in Richtung des Carbonat-Liganden verschoben (d(In-Ct)) = 0,903(1) Å. Die mittleren (In-Niso)- und (In-O)-Abstände betragen 2,1865(4) und 2,1585(5) Å, der (O-In-O′)-Winkel 60,1(2)°. Der Phthalocyaninat(2-)-Ligand (pc2-) ist konkav verzerrt. Die optischen Spektren zeigen nur die typischen, vom Axialliganden unabhängigen π-π*-Übergänge des pc2- -Liganden bei 14600 (B-Bereich), 28000 (Q), 35000 (N) und 40500 cm-1 (L). In den IR-Spektren absorbieren die internen Schwingungen des Oxalat-, Sulfat- und Carbonat-Liganden sowie die asymmetrische (In-O)-Valenzschwingung weitgehend separiert von den pc2--Gerüstschwingungen. Die Spektren-Struktur-Korrelation wird diskutiert.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
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