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  • 1
    Electronic Resource
    Electronic Resource
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 335 (1993), S. 555-557 
    ISSN: 0941-1216
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: (O-Arylcarbamoyl)acetonoximes from 3-Aryl-1-(1-methoxy-1-methylethoxy)ureas and 3-Aryl-1-hydroxyureas - Some Remarks on a Patent Claim
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  • 2
    Electronic Resource
    Electronic Resource
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 336 (1994), S. 550-552 
    ISSN: 0941-1216
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Cyclisation of N-(1-Methoxy-1-methylethoxy)carboxamides to 5,5-Dimethyl-1,4,2-dioxazoles
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  • 3
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 108 (1975), S. 3730-3735 
    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 2,2-Disubstituted 3-Hydroxypropionic Acids with Aliphatic CarbodiimidesThe reaction of 2,2-disubstitued 3-hydroxypropionic acids with aliphatic carbodiimides in tetrahydrofuran yields products like 3, 4, and 7 besides the already known β-lactones 6a-c. In the presence of catalytic amounts of sodium hydroxide 3a rearranges to the isomeric product 4a which is also formed by alkaline hydrolysis of 7a.
    Notes: Die Reaktion 2,2-disubstituierter 3-Hydroxypropionsäuren mit aliphatischen Carbodiimiden in Tetrahydrofuran führt zu Verbindungen vom Typ 3, 4 und 7 sowie zu den bekannten β-Lactonen 6a-c. In Gegenwart katalytischer Mengen Natriumhydroxid läßt sich 3a in das Strukturisomere 4a überführen, das auch bei der alkalischen Hydrolyse von 7a entsteht.
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  • 4
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 106 (1973), S. 2246-2254 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Hydroxylamine Derivatives, LX. Synthesis of 3-Hydroxypropiohydroxamic Acid Derivatives by Means of the Carbodiimide MethodIn the presence of aliphatic carbodiimides C-2 substituted 3-hydroxypropionic acids couple with O-alkylhydroxylamines to yield N-alkoxy-3-hydroxypropionarnides (3). By a suitable choice of reaction conditions side reactions can be largely inhibited. The reactions of hydroxypivalic acid (1d) and 2-phenyltropic acid (If) with hydroxylamine and dicyclohexylcarbodiimide lead in different yields to the corresponding hydroxamic acids (4d,f) and the N,O-diacylated hydroxylamines (5d,f). A further product obtained from the reaction of hydroxypivalic acid is the guanidine 7d. The alkoxyamide-synthesis produces diverse by-products. The formation of compounds such as 6, 8 and 10, depends largely on the nature of the substituents at C-2 of the 3-hydroxypropionic acids investigated.
    Notes: An C-2 substituierte 3-Hydroxypropionsäuren kondensieren in Gegenwart aliphatischer Carbodiimide mit O-Alkylhydroxylaminen zu N-Alkoxy-3-hydroxypropionamiden (3). Durch geeignete Wahl der Reaktionsbedingungen können Nebenreaktionen weitgehend zurückgedrängt werden. Hydroxypivalinsäure (Id) und 2-Phenyltropsäure (If) reagieren mit Hydroxylamin-Base und Dicyclohexylcarbodiimid in unterschiedlicher Ausbeute zur Hydroxamsäure (4d,f) und zum N,O-diacylierten Hydroxylamin (5d,f). Als weiteres Produkt kann aus der Umsetzung der Hydroxypivalinsäure das 1,3-Dicyclohexyl-2-(3-hydroxy-2,2-dimethylpropionyloxy)guanidin (7d) gewonnen werden. Als Nebenprodukte der Alkoxyamid-Synthese fallen in Abhängigkeit von der Substitution an C-2 der 3-Hydroxypropionsäuren Verbindungen vom Typ 6, 8 und 10 an.
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  • 5
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 112 (1979), S. 600-606 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Unexpected Cyclisations of 2,2-Disubstituted N-Alkoxy-3-hydroxypropionamides with Aryl IsocyanatesTreatment of 2,2-disubstituted N-alkoxy-3-hydroxypropionamides (8) with aryl isocyanates (9) in a mole ratio of 1:2 in boiling benzene and in the presence of triethylamine yields 3-alkoxytetrahydro-2H-1,3-oxazine-2,4-diones (10) and 3-aryltetrahydro-2H-1,3-oxazine-2,4-diones (11). Formation of 10 and 11 depends largely on the nature of the substituents at C-2 of 8. In consequence of the cyclisation reactions ureas of type 13 and 14 and the 3-alkoxybiuret 15 are produced.
    Notes: 2,2-Disubstituierte N-Alkoxy-3-hydroxypropionamide (8) reagieren mit Arylisocyanat (9) im Molverhältnis 1:2 bei 80°C in Gegenwart von Triethylamin zu 3-Alkoxytetrahydro-2H-1,3-oxazin-2,4-dionen (10) und 3-Aryltetrahydro-2H-1,3-oxazin-2,4-dionen (11). Die Cyclisierungsrichtung zu 10 oder 11 wird maßgeblich von der Natur der Substituenten an C-2 von 8 bestimmt. Als Folge der Cyclisierungen lassen sich die Harnstoffe 13 und 14 sowie das 3-Alkoxybiuret 15 isolieren.
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  • 6
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1981 (1981), S. 1513-1514 
    ISSN: 0170-2041
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: The Cyclisation of Salicylamides and Salicylohydroxamic Acids with 1,1′-CarbonyldiimidazoleCyclisation of salicylamides 1a, b and salicylohydroxamic acids 1c, d with 1,1′-carbonyldiimid-azole (2) causes formation of 2H-1,3-benzoxazine-2,4(3H)-diones 4a-d. In contrast to statements in the literature isoimides 3 or isoxazoles 5 could not be isolated.
    Notes: Salicylsäureamide 1a, b und Salicylohydroxamsäuren 1c, d cyclisieren mit 1,1′-Carbonyldiimid-azol (2) zu 2H-1,3-Benzoxazin-2,4(3H)-dionen 4a-d. Isoimide 3 oder Isoxazole 5 konnten entgegen Literaturangaben nicht isoliert werden.
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  • 7
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1982 (1982), S. 219-225 
    ISSN: 0170-2041
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Cyclic Carbonylation of 3-Hydroxycarbohydroxamic Acids with 1,1′-CarbonyldiimidazoleThe reaction of 3-hydroxycarbohydroxamic acids 3 with 1,1′-carbonyldiimidazole produces as a function of the substitution of 3 heterocycles of type 1, 4, and 5. In the presence of imidazole the 3-(2-hydroxyalkyl)-1,4,2-dioxazol-5-ones 1 undergo rearrangement into 2-oxazolidones 2.
    Notes: 3-Hydroxycarbohydroxamsäuren 3 reagieren mit 1,1′-Carbonyldiimidazol in Abhängigkeit von der Substitution des Säurerestes zu den Heterocyclen vom Typ 1, 4 und 5. Aus den 3-(2-Hydroxyalkyl)-1,4,2-dioxazol-5-onen 1 erhält man durch Imidazolkatalyse 2-Oxazolidone 2.
    Additional Material: 1 Tab.
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  • 8
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1983 (1983), S. 1177-1184 
    ISSN: 0170-2041
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Synthesis and Properties of 4-benzyloximino- and 4-Hydroxyimino-1,3-dioxan-2-onesUnder suitable conditions the reaction of N-benzyloxy-3-hydroxycarboxamides 7 with phosgene produces 3-benzyloxy-5,6-dihydro-2H-1,3-oxazine-2,4(3H)-diones 8 and 4-benzyloxyimino-1,3-dioxan-2-ones 6. Hydrogenolysis of 6 gives 4-hydroxyimino-1,3-dioxan-2-ones 4 which rearrange in the presence of imidazole into 5,6-dihydro-3-hydroxy-2H-1,3-oxazine-2,4(3H)-diones 5. Treatment of 4a, c with trifluoroacetic anhydride or 4-nitrobenzoyl chloride yields 4-acyloxyimino-1,3-dioxan-2-ones 9.
    Notes: N-Benzyloxy-3-hydroxycarbonsäureamide 7 reagieren mit Phosgen unter geeigneten Bedingungen zu 3-Benzyloxy-5,6-dihydro-2H-1,3-oxazin-2,4(3H)-dionen 8 und 4-Benzyloxyimino-1,3-dioxan-2-onen 6. Die katalytische Hydrierung von 6 ergibt 4-Hydroxyimino-1,3-dioxan-2-one 4, welche in Gegenwart von Imidazol zu 5,6-Dihydro-3-hydroxy-2H-1,3-oxazin-2,4(3H)-dionen 5 isomerisieren. Aus den Umsetzungen von 4a, c mit Trifluoracetanhydrid oder 4-Nitrobenzoylchlorid erhält mit in glatter Reaktion 4-Acyloxyimino-1,3-dioxan-2-one 9.
    Additional Material: 1 Tab.
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  • 9
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1984 (1984), S. 894-899 
    ISSN: 0170-2041
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: 1,2-Oxazetidin-3-ones from (2-Thienyl)glycolohydroxamic Acids and 1,1′-CarbonyldiimidazoleReaction of (2-thienyl)glycolohydroxamic acids 6 with 1,1′-carbonyldiimidazole yields 1,2-oxaze-tidin-3-ones 3B in high yields. The conversion of 6 into 3B proceeds via the intermediate 5B which can be isolated under suitable conditions.
    Notes: (2-Thienyl)glycolohydroxamsäuren 6 reagieren mit 1,1′-Carbonyldiimidazol in hohen Ausbeuten über die unter geeigneten Bedingungen isolierbare Zwischenstufe 5B zu 1,2-Oxazetidin-3-onen 3B.
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  • 10
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1988 (1988), S. 35-38 
    ISSN: 0170-2041
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Synthesis and Reactivity of 2-Unsubstituted 1,5,2-Dioxazinane-3,6-dionesTreatment of 3-(benzyloxy)-4H-1,5,2-dioxazin-6-ones 5 with trifluoroacetic acid affords 2-unsubstituted 1,5,2-dioxazinane-3,6-diones 4, which undergo rearrangement into 3-hydroxyoxazolidine-2,4-diones 2 under various conditions. Depending on the substitution at C-4, the reaction of 4 with aryl isocyanates produces 2-carbamoyl-1,5,2-dioxazinane-3,6-diones 7 or the oxazolidine derivatives 8. Catalytic hydrogenation of 5b, c gives 2-hydroxy carboxamides 6a, b.
    Notes: Die Acidolyse von 3-(Benzyloxy)-4H-1,5,2-dioxazin-6-onen 5 mit Trifluoressigsäure ergibt 2-unsubstituierte 1,5,2-Dioxazinan-3,6-dione 4, die sich unter verschiedenen Bedingungen in 3-Hydroxyoxazolidin-2,4-dione 2 umlagern. Aus der Umsetzung von 4 mit Arylisocyanat resultiert in Abhängigkeit von der Substitution an C-4 entweder ein 2-carbamoyliertes 1,5,2-Dioxazinan-3,6-dion 7 oder ein Oxazolidin-Derivat 8. Die katalytische Hydrierung von 5b, c führt unter Ringöffnung zu den 2-Hydroxycarboxamiden 6a, b.
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