Zobrazeno 1 - 10
of 146
pro vyhledávání: '"Aleksander Zamojski"'
Autor:
Slawomir Jarosz, Aleksander Zamojski
Publikováno v:
Current Organic Chemistry. 7:13-33
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::6981085883f1e7e8e8a7f7f1244b26c7
https://doi.org/10.2174/1385272033373265
https://doi.org/10.2174/1385272033373265
Publikováno v:
Tetrahedron Letters. 43:1337-1340
A number of modifications of the original Grignard C 1 homologation of hexoses was examined, e.g. reactions of protected hexodialdo-1,5-pyranosides with benzyloxymethyllithium, transmetalation, precomplexation of the aldehydes. Some of the modificati
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::7f5f4825d07f33a76e4e6d429a2d0538
https://doi.org/10.1016/s0040-4039(01)02376-0
https://doi.org/10.1016/s0040-4039(01)02376-0
Autor:
Aleksander Zamojski, Halszka Stepowska
Publikováno v:
Carbohydrate Research. 332:429-438
A four-step procedure for homologation of methyl α- d - manno furanoside and α- d - manno pyranoside was examined. The reactions consisted in (i) oxidation of the terminal hydroxymethyl group in a protected sugar derivative to an aldehyde; (ii) rea
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::a17a6ef940e7f8080b1f888eb1cf97ff
https://doi.org/10.1016/s0008-6215(01)00103-3
https://doi.org/10.1016/s0008-6215(01)00103-3
Publikováno v:
Collection of Czechoslovak Chemical Communications. 65:610-620
Three methyl 2,3,4-tri-O-acetyl-α-D-hexopyranosides of the manno, gluco, and galacto configuration were oxidized to the corresponding methyl hexodialdo-1,5-pyranosides and then reacted with allyloxymethylmagnesium chloride. Methyl heptopyranosides o
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::9708e0ac6e068bd1112adcfd8c629366
https://doi.org/10.1135/cccc20000610
https://doi.org/10.1135/cccc20000610
Autor:
Aleksander Zamojski, Halszka Stepowska
Publikováno v:
Carbohydrate Research. 321:105-109
Three O -isopropylidene group-protected pentose aldehydes (methyl 2,3- O -isopropylidene-β- d - ribo -pentodialdo-1,4-furanoside ( 1 ), methyl 2,3- O -isopropylidene-α- d - lyxo -pentodialdo-1,4-furanoside ( 2 ), and 3- O -benzyl-1,2- O -isopropyli
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::8074b4f777f3975a29a007fa69586b3b
https://doi.org/10.1016/s0008-6215(99)00165-2
https://doi.org/10.1016/s0008-6215(99)00165-2
Publikováno v:
Carbohydrate Research. 320:244-249
Methyl β-d-glucopyranoside reacted with a 4-molar excess of the Mitsunobu reagents (triphenylphosphine–diethyl azodicarboxylate–benzoic acid) under Weinges et al. [Carbohydr. Res., 164 (1987) 453–458] conditions to furnish four differently ben
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::4b0ffd45bb16452a59ab4dd72442ba16
https://doi.org/10.1016/s0008-6215(99)00160-3
https://doi.org/10.1016/s0008-6215(99)00160-3
Autor:
Aleksander Zamojski, Halszka Stepowska
Publikováno v:
Tetrahedron. 55:5519-5538
Derivatives of four stereoisomeric pentodialdo-1,4-furanoses were reacted with four Grignard C 1 reagents: methoxymethyl-, allyloxymethyl-, benzyloxymethyl, and dimethylphenylsilylmethyl-magnesium chlorides. Derivatives of the expected stereoisomeric
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::287241d3181655d76639be4e830b68ac
https://doi.org/10.1016/s0040-4020(99)00197-0
https://doi.org/10.1016/s0040-4020(99)00197-0
New syntheses of two epimers of (+)-castanospermine: (+)-8a-Epi- and (+)-1,8a-Di-epi-castanospermine
Autor:
Aleksander Zamojski, Ewa Bartnicka
Publikováno v:
Tetrahedron. 55:2061-2076
Two epimers of (+)-castanospermine, (1S,6S,7R,8R,8aS)-1,6,7,8-tetrahydroxyindolizidine [(+)-8a-epi-castanospermine] (4) and (1R,6S,7R,8R,8aS) derivative [(+)-1,8a-di-epi-castanospermine] (5) were synthesized from methyl α-D-glucopyranoside.
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::0fadb3e536f1fdba11cff4a433ae6010
https://doi.org/10.1016/s0040-4020(98)01218-6
https://doi.org/10.1016/s0040-4020(98)01218-6
Autor:
Lore Brade, Leon V. Backinowsky, Otto Holst, Konstantin V. Antonov, Aleksander Zamojski, Barbara Grzeszczyk
Publikováno v:
Carbohydrate Research. 314:85-93
Synthesis of the title trisaccharide was accomplished by sugar chain extension starting from the non-reducing terminus: coupling of Glc p NAc with ld -Hep p , then adding Glc p -OAll. An alternative route started from the reducing end: coupling of ld
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::efec6be3f800ce787f52bfc1c91ed2eb
https://doi.org/10.1016/s0008-6215(98)00292-4
https://doi.org/10.1016/s0008-6215(98)00292-4
Publikováno v:
Tetrahedron. 54:14201-14212
(Phenylthio)acetyliron complex 3 was obtained by reaction of the anion generated with butyllithium from acetyliron complex 4 with diphenyl disulphide. Alkylation and aldol reactions of the anion of 3 were investigated. X-Ray structural determination
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::4e2c8155ef6b63e1c1a1bc0ec8f2e7cf
https://doi.org/10.1016/s0040-4020(98)00874-6
https://doi.org/10.1016/s0040-4020(98)00874-6