Zobrazeno 1 - 8
of 8
pro vyhledávání: '"LJUBINKA B. LORENC"'
Autor:
JAROSLAV KALVODA, LJUBINKA B. LORENC, SASA MARTINOVIC, MILAN M. DABOVIC, VLADIMIR D. PAVLOVIC
Publikováno v:
Journal of the Serbian Chemical Society, Vol 69, Iss 11, Pp 861-869 (2004)
In the present paper, the preparation of 3b-hydroxy-17b-dimethyl-tert-butylsilyloxy-5-azaandrostane (15) in fourteen steps is described. B-nor-17-oxoandrost-5-en-3b-yl acetate (1) was used as the starting material, which was transformed to the key in
Externí odkaz:
https://doaj.org/article/8b2eea01e5dd467a844eca90be4fa16c
Autor:
VLADIMIR D. PAVLOVIC, LJUBINKA B. LORENC, MILAN M. DABOVIC, MIRA S. BJELAKOVIC, NATALIJA M. KRSTIC
Publikováno v:
Journal of the Serbian Chemical Society, Vol 69, Iss 6, Pp 413-420 (2004)
Beckmann rearrangement of (Z)-cholest-4-en-6-one oxime (4) (prepared in 4 steps starting from cholest-5-en-3b-ol (1)) with thionyl chloride in dioxane solution afforded an enamide-type lactam, i.e., 7-aza-B-homocholest-4-en-6-one (6) as a single prod
Externí odkaz:
https://doaj.org/article/82f3571647ab4c8d8bd7eefdcf5efd2f
Publikováno v:
Journal of the Serbian Chemical Society, Vol 68, Iss 11, Pp 785-794 (2003)
5-Hydroxy-1-oxo-5a-cholestan-3b-yl acetate (11) was prepared in 5 steps starting from (E)-3b-acetoxy-5,10-seco-1(10)-cholesten-5-one (6). Treatment of the 1-oxo-5-hydroxy derivative 11 with lead tetraacetate (LTA) (under thermal or hypoiodite conditi
Externí odkaz:
https://doaj.org/article/f476265664c24bf78907903d97bf759a
Publikováno v:
Journal of the Serbian Chemical Society, Vol 68, Iss 4-5, Pp 303-312 (2003)
The acid-catalyzed reaction of (Z)- and (E)-B-nor-5,10-seco-ketones 2 and 3 resulted in an intramolecular cyclization to give the 5-hydroxy-A-nor-1b,5b-10(19)-methylidene derivative 8, the 5b-hydroxy-A-nor-1(10)-unsaturated compound 9 and the 5b,10a-
Externí odkaz:
https://doaj.org/article/f124b02e9ab143e2a0dbdfa7de03c66a
Publikováno v:
Journal of the Serbian Chemical Society, Vol 67, Iss 2, Pp 69-75 (2002)
B-Norcholestane epoxide 2 is reduced with lithium aluminium hydride to give either the 3b,6a-diol 3 or the corresponding 3b,5a-diol 4, depending on the quality of the reducing reagent employed. A plausible mechanistic explanation of the obtained resu
Externí odkaz:
https://doaj.org/article/5a14731c03e84474840d1f874ba0e929
Publikováno v:
Journal of the Serbian Chemical Society, Vol 65, Iss 11, Pp 769-772 (2000)
Expoxidation of cholesta-5,8-dien-3b-yl acetate (1) with peracids takes place preferentially at the more highly substituted D8-olefinic double bond to give: (a) with monoperphthalic acid, 8a,9a-epoxycholest-5-en-3b-yl acetate (2) (in 39 % yield) and
Externí odkaz:
https://doaj.org/article/be29b46d09524776a080bed32b0acc54
Publikováno v:
Journal of the Serbian Chemical Society, Vol 65, Iss 3, Pp 147-156 (2000)
The Diels-Alder adduct (3), obtained by cycloaddition of 7-dehydrocholesteryl acetate (1) and maleic anhydride (2), was heated at ca. 90°C with a large excess of lead tetraacetate in pyridine solution for 5 h. Under these conditions, compound 3 unde
Externí odkaz:
https://doaj.org/article/6b5904ce86194b27b3f66b05e66a7115
Autor:
Mira S. Bjelaković, Ljubinka B. Lorenc, Vladimir D. Pavlović, Bernard Tinant, Jean-Paul Declercq, Jaroslav Kalvoda
Publikováno v:
Helvetica Chimica Acta; Jun2003, Vol. 86 Issue 6, p2121, 15p