Zobrazeno 1 - 10
of 92
pro vyhledávání: '"W. Stöcklin"'
Publikováno v:
Helvetica Chimica Acta. 50:2457-2476
The roots of Asclepias swynnertonii S. Moore are very rich in glycosides, the major portion being pregnane glycosides besides small amounts of cardenolides. Six cardenolides could be identified by means of chromatography: coroglaucigenin, ascleposide
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::3c52e654af4e7a24d9b0dbb12cd5a8b9
https://doi.org/10.1002/hlca.19670500831
https://doi.org/10.1002/hlca.19670500831
Publikováno v:
Helvetica Chimica Acta. 51:117-133
The seeds of Dregea abyssinica (HOCHST.) K. Schum. are very rich in glycosides. These consist of a complicated mixture of ester glycosides, cardenolides are absent. All these glycosides are derived from only the two known pregnane derivatives drevoge
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::8694ad64d69aa84ff037c59ab70c38d2
https://doi.org/10.1002/hlca.19680510113
https://doi.org/10.1002/hlca.19680510113
Publikováno v:
Phytochemistry. 10:411-417
Three additional lactones, two of them new, have been isolated from extracts of Castela nicholsoni Hook. from which chaparrin, glaucarubol, glaucarubol 15-isovalerate and amarolide have previously been obtained. The structures and stereochemistry of
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::da01fa3c1fc0b24b958223dd35d752d8
https://doi.org/10.1016/s0031-9422(00)94058-5
https://doi.org/10.1016/s0031-9422(00)94058-5
Publikováno v:
Helvetica Chimica Acta. 53:221-245
Dried leaves of Marsdenia erecta R. Br. gave over 6% of a crude glycoside mixture, the main portion of which consisted of weakly polar material, soluble in ether or chloroform. By mild acid hydrolysis it yielded crude sugars and aglycones. The follow
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::44a565530d47cbbe9ba1cd305637424c
https://doi.org/10.1002/hlca.19700530204
https://doi.org/10.1002/hlca.19700530204
Publikováno v:
Tetrahedron Letters. 10:1313-1316
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::94e07b5667ae73a25ec4a2b3ed163d7c
https://doi.org/10.1016/s0040-4039(01)87872-2
https://doi.org/10.1016/s0040-4039(01)87872-2
Autor:
W. Stöcklin
Publikováno v:
Helvetica Chimica Acta. 51:1235-1242
The structure of gymnestrogenin, a new triterpene from the leaves of Gymnema sylvestre R. Br. (Asclepiadaceae), is proposed to be that of 3β, 16β, 21β, 23, 28-pentahydroxy-olean-12-ene.
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::0af6b58b8cf23884994d0e925e989a2a
https://doi.org/10.1002/hlca.19680510606
https://doi.org/10.1002/hlca.19680510606
Publikováno v:
Helvetica Chimica Acta. 52:2086-2106
From the latex of Calotropis procera, HESSEet al. [2] had isolated free calotropagenin (8) and six of its glycosides. We now obtained three additional compounds: uzarigenin (4), syriogenin [10] (a 3 β, 14α, x-trihydroxy-card-(20:22)-enolide) and pr
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::26f7d6bada071f0b93327dba16861acd
https://doi.org/10.1002/hlca.19690520731
https://doi.org/10.1002/hlca.19690520731
Publikováno v:
Helvetica Chimica Acta. 51:767-772
The following structures for the two new genins G and H from Sarcostemma viminale have been deduced. Genin G is shown to be 12-O-benzoyl-deacetylmetaplcxigenin (3). On the basis of physical data, its behaviour in KOH-methanol solution and its positiv
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::d7c1ea0fb45305a424dffbd3f8a9e748
https://doi.org/10.1002/hlca.660510417
https://doi.org/10.1002/hlca.660510417
Autor:
T.A. Geissman, W. Stöcklin
Publikováno v:
Tetrahedron Letters. 9:6007-6010
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::a0445f63b8735e4e94767c6153f4b89f
https://doi.org/10.1016/s0040-4039(00)70779-9
https://doi.org/10.1016/s0040-4039(00)70779-9
Publikováno v:
Helvetica Chimica Acta. 52:1429-1461
Hirundigenin can easily be converted into anhydrohirundigenin by thermal dehydration. Both substances are stable to alkali but unstable under acid conditions. Dehydrogenation of anhydrohirundigenin, using selenium at 310°, gave a mixture of 2-methyl
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::b6eb2faf715b272277daa8bf13f5dc87
https://doi.org/10.1002/hlca.19690520605
https://doi.org/10.1002/hlca.19690520605