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  • 1
    Electronic Resource
    Electronic Resource
    s.l. : American Chemical Society
    Journal of the American Chemical Society 103 (1981), S. 5916-5917 
    ISSN: 1520-5126
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    s.l. : American Chemical Society
    The @journal of organic chemistry 42 (1977), S. 4213-4217 
    ISSN: 1520-6904
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 3
    ISSN: 1573-6776
    Source: Springer Online Journal Archives 1860-2000
    Topics: Process Engineering, Biotechnology, Nutrition Technology
    Notes: Abstract Highly active lipase and protease complexes were prepared by non-covalent modification with stearic acid. The protein content and yield of the modified enzyme complexes depended on the enzymes' source. The increase in the transesterification activity of the modified enzymes was 15 fold for Candida rugosa lipase and porcine pancreatic lipase, with preservation of the enantioselectivity. Pseudomonas sp. lipase which showed no activity in its crude form, exhibited an activity of 38 μmol/h·mg protein in the modified form. © Rapid Science Ltd. 1998
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1995 (1995), S. 433-436 
    ISSN: 0947-3440
    Keywords: Aminophosphonates ; Phosphonates ; Amines ; Nitro compounds ; Peptides ; Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The synthesis of 2-(Aminophenyl)-2-hydroxyethylphosphonates rac-4a-c is based on the formation of a hydroxyl function via addition of the lithium salt of dimethyl methylphosphonate (2) to aldehydes 1a-c. The amino function in rac- 4a-c is obtained by catalytic reduction of the nitro group in 3 at low pressure. The incorporation of the aminophosphonates rac-4a-c in short peptides, enables the formation of potential bioactive materials 12-14.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1983 (1983), S. 8-12 
    ISSN: 0170-2041
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Synthesis of 2 Substituted 2-PyrrolidonesThe preparation of the 2-pyrrolidone derivatives 6a, b via β-formyldicarboxylates 4a, b _ starting from 1a, b and 2a, b _ is described; reaction of 4a and 4b in ethanol in the presence of ammonium carbonate gave 5a and 6a, b, respectively. 6a was separated by chromatography into the isomers 7 and 8, 5a is also obtained by reaction of 4a in ethanol in the presence of p-toluenesulfonic acid; 5a in ethanol in the presence of ammonium carbonate at room temperature remained unchanged after 3 days.
    Notes: Die Darstellung der 2-Pyrrolidonderivate 6a, b über die β-Formyldicarbonsäure-diester 4a, b wird beschrieben _ ausgehend von 1a bzw. 1b und 2a bzw. 2b; mehrtägiges Stehenlassen von 4a oder 4b führt in Ethanol in Gegenwart von Ammoniumcarbonat zu 5a sowie zu 6a, b, wobei 5b nicht isoliert worden ist. 6a kann in die Isomeren 7 und 8 getrennt werden. 5a entsteht auch bei der Reaktion von 4a mit Ethanol in Gegenwart von p-Toluolsulfonsäure, welches sich nach 3tägigem Stehenlassen bei Raumtemperatur in Ethanol in Anwesenheit von Ammoniumcarbonat nicht verändert.
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1992 (1992), S. 1005-1009 
    ISSN: 0170-2041
    Keywords: Oxime ethers ; α-Azido oxime ethers ; α-Amino oxime ethers ; 1,2-Ethanediamines ; Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Oxime ethers 1 react with ammonia and primary amines to give α-amino oxime ethers. The reaction of α-bromo oxime ethers with sodium azide affords α-azido oxime ethers. Hydrogenolysis of the azido compounds using 5% palladium on calcium carbonate as catalyst yields the α-amino oxime ethers. The reaction of α-azido oxime ethers with lithium aluminum hydride gives 1,2-ethanediamine derivatives. The reaction of azido oxime ether 13 with LiAlH4, and subsequently the reaction of the resulting mixture of the diamines 14 and 15 with phosgene, preferably gives cis-4-pentyl-5-methyl-2-imidazolidone (16) indicating that the reduction of 13 proceeds in a stereoselective manner to furnish mainly the syn-1,2-ethanediamine 15.
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1993 (1993), S. 955-958 
    ISSN: 0170-2041
    Keywords: α-Amino phosphonic acids ; Nitrones ; N-Ethoxyiminium salts ; Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Syntheses of α-Aminophosphonic Acids from N-Ethoxyiminium Salts, IINitrones 2 obtained from aldehydes 1 are used for the synthesis of N-ethoxyiminium salts 3. These react with several esters of hydrogen phosphite 4 to give the N-methyl α-amino phosphonic esters 5 to 13. The N-benzyl α-amino phosphonic esters 24 and 25 can be obtained by the same procedure. Hydrogenolysis and ester hydrolysis afford the α-amino phosphonic acids 14 as well as 26 and 27, respectively.
    Type of Medium: Electronic Resource
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  • 8
    ISSN: 0170-2041
    Keywords: Oligocyclization ; Oxime Ethers ; Aggregates ; Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Reaction of the dilithium salts of the dioxime diethers 1 gives the polyoxime-based macrocyclic systems 2-4. Temperature and lithium effects indicate that mixed aggregates play an important role in the formation of these heterocyclic systems by oxidative coupling. An X-ray structure analysis of 3f has been carried out showing that the thermodynamically unfavored Z configuration is a characteristic feature of this reaction product.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
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  • 9
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1980 (1980), S. 686-692 
    ISSN: 0170-2041
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Cycloaddition Reactions of α-Chloroalkylideneamine Oxides with Hetero-enes, I; Carbonyl CompoundsCycloaddition reaction of N-(2-chloroethylidene)cyclohexylamine oxide (2) with the hetero-enes 1a - 1f at 10°C in the presence of AgBF4 in 1,2-dichloroethane as solvent furnishes the reactive, dipolar intermediate iminium salts 3a - 3f. Subsequent reduction of 3a - 3f in water by NaBH4 yields the substituted 1,3-dioxa-4-azacyclohexanes 4a - 4f. From the bicyclic “hetero-ene” camphor (5) and from cholestanone (8) the spirocyclic compounds 7 and 9 have been obtained in an analogous way.  -  On the other hand, reaction of the hetero-enes 1c, 1e, 1f, and cyclododecanone (11) with 2 in the presence of AgBF4 give the iminium salts 3c, 3e, 3f and 12 which, in aquous 10% KCN solution, yield the nitriles 10a - 10c and 13 as mixtures of their isomers.
    Notes: Durch Cycloaddition des aus N-(2-Chlorethyliden)cyclohexylamin-oxid (2) in Gegenwart von AgBF4 in 1,2-Dichlorethan bei -10°C entstehenden reaktiven dipolaren Zwischenprodukts an die Hetero-ene 1a - 1f sowie anschließende reduktive Behandlung der Iminiumsalze 3a - 3f mit NaBH4 in Wasser entstehen die substituierten 1,3-Dioxa-4-azacyclohexane 4a - 4f; aus dem bi-cyclischen “Hetero-en” Campher (5) und aus Cholestanon (8) werden in analoger Weise die spiro-cyclischen Verbindungen 7 bzw. 9 erhalten.  -  Andererseits werden aus 1c, 1e, 1f sowie aus Cyclododecanon (11) mit 2 in Gegenwart von AgBF4 und anschließender Reaktion der Iminiumsalze 3c, 3e, 3f bzw. 12 mit 10proz. wäßriger KCN-Lösung die Nitrile 10a - 10c sowie 13 als Isomerengemische synthetisiert.
    Type of Medium: Electronic Resource
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  • 10
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1982 (1982), S. 226-230 
    ISSN: 0170-2041
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: (2-Chloralkylidene)amine Oxides as Alkylation Reagents; Reactions with Amines and the Anions of Dialkyl MalonatesAminolysis of N-(2-chloroethylidene)cyclohexylamine oxide (1) in ether at 25°C with the amines 2a-d yields the (2-aminoalkylidene)amine oxides 3a-d. The aminolysis of 1 with the tertiary amines 5a-c yields the ammonium salts 6a-c, and the reaction of N-(2-chloropropylidene)-cyclohexylamine oxide (8) in benzene at 60°C with the anions of dialkyl malonates (7a, b) yields the nitrones 9a, b. The hydrolytic cleavage of 9a, b to the aldehydes 10a, b is described.
    Notes: Aminolyse von N-(2-Chlorethyliden)cyclohexylamin-oxid (1) in Ether bei 25°C mit den Aminen 2a-d liefert die (2-Aminoalkyliden)amin-oxide 3a-d. Durch Aminolyse von 1 mil den tertiären Aminen 5a-c entstehen die Ammoniumsalze 6a-c, und durch Reaktion von N-(2-Chlorpropyliden)cyclohexylamin-oxid (8) in Benzol bei 60°C mit den Anionen der Malonsäure-dialkylester (7a, b) werden die Nitrone 9a, b erhalten. Die hydrolytische Spaltung von 9a, b zu den Aldehyden 10a, b wird beschrieben.
    Type of Medium: Electronic Resource
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