Zobrazeno 1 - 10
of 39
pro vyhledávání: '"Czeslaw Belzecki"'
Publikováno v:
Synthetic Communications. 30:2245-2252
Subsequent treatment of N-crotoyl-(1S,2R)-bornane-10,2-sultam with EtMgCl, recrystallization of the product and saponification, afforded R-(-)-3-methylpenthanoic acid which was used for acylation of (1R,2S)-bornane-10,2-sultam. The product was conver
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::9f999be265a6da660eed361a701e825e
https://doi.org/10.1080/00397910008087404
https://doi.org/10.1080/00397910008087404
Publikováno v:
Tetrahedron. 53:14153-14168
Readily available from d -arabinal and l -rhamnal 2-C:1-N-carbonyl-2-deoxy-β- d -arabino- and -α- l -gluco-pyranosylamines 5, 25 and 26 were transformed into cephems 45 and 49 via a sequence of reactions consisting of alkylation of the β-lactam ni
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::1fe0d7733a4de82bf6fa20268bea7e58
https://doi.org/10.1016/s0040-4020(97)00917-4
https://doi.org/10.1016/s0040-4020(97)00917-4
Autor:
Czeslaw Belzecki, Marek Chmielewski
Publikováno v:
Journal of Carbohydrate Chemistry. 13:1103-1114
2,4,6-Tri-O-benzyl-D-galactal (1) was transformed into a 1-oxacephem skeleton. The sequence of reaction involved: [2+2]cycloaddition, N-alkylation, glycolic cleavage of the vic-diol grouping, reduction of dialdehyde and cyclization to the title skele
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::3a1f6fc5a391c427ea351f827a9ac8c0
https://doi.org/10.1080/07328309408011852
https://doi.org/10.1080/07328309408011852
Publikováno v:
ChemInform. 22
Methyl 2-methoxy- and 2-tert-butoxycarbonylamino-2-deoxy-glycosides were obtained from methyl 2-carbamoyl-2-deoxyglycosides via Hofmann rearrangement with sodium methoxide/bromine/methanol or sodium hydroxide/sodium bromite/methanol or lead tetraacet
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::21e354702c707686b1499b5b76253b5b
https://doi.org/10.1002/chin.199144281
https://doi.org/10.1002/chin.199144281
Publikováno v:
ChemInform. 23
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::e7e95a6fd5675165213130f3a84d8342
https://doi.org/10.1002/chin.199212270
https://doi.org/10.1002/chin.199212270
Autor:
Jacek Grodner, Czeslaw Belzecki, W. Abramski, R. Urbanski, Z. Kahuza, Danuta Mostowicz, Marcin K. Chmielewski
Publikováno v:
ChemInform. 25
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::a334eaadb1354c7746a798bf652af9cb
https://doi.org/10.1002/chin.199452155
https://doi.org/10.1002/chin.199452155
Publikováno v:
ChemInform. 29
Readily available from d -arabinal and l -rhamnal 2-C:1-N-carbonyl-2-deoxy-β- d -arabino- and -α- l -gluco-pyranosylamines 5, 25 and 26 were transformed into cephems 45 and 49 via a sequence of reactions consisting of alkylation of the β-lactam ni
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::adafd21e08c68bc95fec4bcbe2b12c42
https://doi.org/10.1002/chin.199804232
https://doi.org/10.1002/chin.199804232
Publikováno v:
Tetrahedron. 47:10087-10094
It was found that 1,3-dipolar cycloaddition of nitrones derived from formaldehyde and acetaldehyde to sugar enlactones proceeds regio- and stereospecifically to afford anti - endo adducts.
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::d794fb74cd92bb17d1464043f4f10b3d
https://doi.org/10.1016/s0040-4020(01)96057-0
https://doi.org/10.1016/s0040-4020(01)96057-0
Autor:
R. Urbanski, Danuta Mostowicz, Zbigniew Kałuża, Czeslaw Belzecki, Jacek Grodner, Marek Chmielewski, W. Abramski
Publikováno v:
Synlett. 1994:539-541
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::1dc4bb05137623a1cbbbdcdd33a8a5e5
https://doi.org/10.1055/s-1994-22921
https://doi.org/10.1055/s-1994-22921