Výsledky vyhledávání - "Helmut Kristen"

Synthesis of a heteroglycuronan derivative containingthe β

Autor: Helmut Kristen, Vitali I. Betaneli, Christian Vogel, Wolfram Steffan, Andrej Ya. Ott, Nikolay K. Kochetkov, Hanna Boye

Publikováno v: Carbohydrate Research. 237:131-144

Helferich glycosylation of the cyanoethylidene l -rhamnose derivative 3 with the galactosyluronicbromide 2 gave the disaccharide 4 as a key intermediate in the synthesis of the monomer 13 for trityl-cyanoethylidene condensation ( TCC ). The following

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::a97171bc1a6f6998217ac715507ab317
https://doi.org/10.1016/s0008-6215(92)84238-n

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Synthesis, Crystal Structure, and Some Reactions of 2,3,4-Tri-O-acetyl-β-D-Galactopyranurono-6, 1-lactone

Autor: Christian Vogel, Helmut Kristen, Wolfram Steffan, Bernd Liebelt

Publikováno v: Journal of Carbohydrate Chemistry. 11:287-303

D-Gluco-, D -galacto-, and D-manno-configurated 6, 1-lactones of uronic acid were synthesized. A new synthetic approach based on the photobromination. hydrolysis, and oxidation of the corresponding 1,6-anhydro sugars is reported. Conformational studi

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::68b0992371fb4e99f5a0a66dbe5a93f7
https://doi.org/10.1080/07328309208017994

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Zur Stereochemie von N,N′-Bis-[3-(o-ethoxyphenoxy)-2-hydroxy-propyl]-ethylendiamin

Autor: H. Widuwild, F. Wrubel, L. Lücke, Helmut Kristen

Publikováno v: Journal für Praktische Chemie. 333:545-554

Stereochemistry of N,N′-Bis-[3-(o-ethoxyphenoxy)-2-hydroxy-propyl]-ethylendiamine N,N′-Bis-[3-(o-ethoxyphenoxy)-2-hydroxy-propyl]-ethylene diamine (5), synthesized from racemic 1,2-anhydro-3-O-(o-ethoxyphenyl)-glycerol (1) and ethylene diamine (2

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::502536f528de18b3f390514c25ec3002
https://doi.org/10.1002/prac.19913330405

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d-Galactose-derived d-galacturonic acid derivatives suitable as glycosyl acceptors

Autor: Helmut Kristen, Wolfram Steffan, Christian Vogel

Publikováno v: Carbohydrate Research. 204:109-120

Allyl ( 1a ) and benzyl ( 1b ) β- d -galactopyranosides were converted into methyl [allyl (and benzyl) 2- O -acetyl-3,4- O -isopropylidene-β- d -galactopyranosid]uronates, ( 6a and 6b ) by three different routes. The carboxyl group was introduced b

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::b31dc399b8c66b253169177b8a3685bf
https://doi.org/10.1016/0008-6215(90)84026-q

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Galacturonsäurederivate. I. Galacturonate aus Acetyl- und Isopropyliden-D-galactopyranosen

Autor: H. Boye, Helmut Kristen, C. Vogel

Publikováno v: Journal für Praktische Chemie. 332:28-36

Galacturonic Acid Derivatives. I. Galacturonates from Acetyl- and Isopropylidene-D-galactopyranoses Galacturonic acid derivatives to be employed as glycosyl donors in saccharide synthesis are prepared from galacturonic acid itself or from galactose.

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::6bd1e3d8c041795d524687206c95d729
https://doi.org/10.1002/prac.19903320104

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