Zobrazeno 1 - 10
of 74
pro vyhledávání: '"Peter Lemmen"'
Publikováno v:
Journal of Asian Natural Products Research. 14:987-1001
Phytochemical analysis of aqueous MeOH extract of Maesa lanceolata stem wood has led to the isolation of four new triterpene saponins characterized as 16α,21β-diacetoxy-22α-angeloyl-28-hydroxyolean-12-ene 3-O-[α-rhamnopyranosyl-(1″″ → 6‴)
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::ff658ce12c6e2b7d661fa69436598523
https://doi.org/10.1080/10286020.2012.674302
https://doi.org/10.1080/10286020.2012.674302
Autor:
Charles O. Ochieng, Peter Lemmen, Sylvia A. Opiyo, Lawrence Onyango Arot Manguro, Elijah Ateka, Philip O. Owuor
Publikováno v:
The Natural Products Journal. 1:116-120
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::2cd70fdcd03111358518da4c6b6d649b
https://doi.org/10.2174/2210316311101020116
https://doi.org/10.2174/2210316311101020116
Publikováno v:
Tetrahedron. 68:4048-4056
Six cyclic stilbene derivatives with hindered free rotation around the C(vinyl)–C(phenyl) single bond were synthesized by McMurry coupling. The torsion angles around the double and the single bond, and the CC bond length were obtained for many of t
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::f3b6e103556afa200fab2baab955597d
https://doi.org/10.1016/j.tet.2012.03.038
https://doi.org/10.1016/j.tet.2012.03.038
Autor:
Sylvia A. Opiyo, Elijah Ateka, Lawrence Onyango Arot Manguro, Peter Lemmen, Philip Okinda-Owuor
Publikováno v:
Phytochemistry Letters. 4:161-165
7α-Acetylugandensolide together with thirteen known drimane-type sesquiterpenes have been isolated from Warbugia ugandensis bark extracts. Their structures were established by spectroscopic and physical methods as well as comparison with data availa
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::ca103f6821eee85fcef008e8d33fa55c
https://doi.org/10.1016/j.phytol.2011.02.007
https://doi.org/10.1016/j.phytol.2011.02.007
Publikováno v:
Records of Natural Products, Vol 5, Iss 3, Pp 147-157 (2011)
Fractionation of EtOAc and aqueous MeOH extracts of Ajuga remota underground part has led to the isolation of four new iridoid glycosides identified as 2', 3'-diacetyharpagide (1), 6'-O-rhamnosylharpagide (2), 6'-O-galloyl-7,8-dehydroharpagide (3) an
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doajarticles::dbf62e06847b2874c98907ef4d385d23
Autor:
Eberhardt HerdtweckE. Herdtweck, Peter Lemmen, Lawrence Onyango Arot Manguro, Sylvia A. Opiyo
Publikováno v:
Canadian Journal of Chemistry. 87:1173-1179
Chemical analysis of the acetone extract of Commiphora holtziana gum resin has led to the isolation of triterpenes characterized as methyl 3-oxo-1α,19α,28-trihydroxyurs-12-en-24-oate (1), methyl 3β-acetyl-2α,11α,19α,28-tetrahydroxyurs-12-en-24-
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::46ece8d90bdfdbf4a39a3bf28728cb94
https://doi.org/10.1139/v09-078
https://doi.org/10.1139/v09-078
Publikováno v:
Phytochemistry. 67:2641-2650
An investigation of an ethyl acetate extract of Embelia schimperi leaves has led to the isolation of 10 oleanane-type triterpenes characterized as 3beta,16alpha-di-O-acetyl-13beta, 28-epoxyoleanane (1), 3beta-acetyl-16-oxo-13beta, 28-epoxyoleanane (2
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::23052cbd472159f3c84f495c02a482ab
https://doi.org/10.1016/j.phytochem.2006.07.025
https://doi.org/10.1016/j.phytochem.2006.07.025
Publikováno v:
Journal of the Chinese Chemical Society. 52:201-208
Five new flavonol glycosides characterized as syringetin 3-O-a-rhamnoside-7-O-β-glucoside, syringetin 3-O-α-rhamnoside-7,4'-di-O-β-glucoside, quercetin-7-O-β-galactosyl (1→3)-β-galactoside, myricetin 3-O-α-rhamnosyl (1→4)-β-galactoside and
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::a0fe213c6b07420f7554d87c52b20e3f
https://doi.org/10.1002/jccs.200500029
https://doi.org/10.1002/jccs.200500029
Publikováno v:
Phytochemistry. 63:497-502
An investigation of methanolic extract of Warburgia stuhlmannii leaves has led to the isolation of two new drimane-type sesquiterpene glycosides characterized as mukaadial 6-O-beta-D-glucopyranoside, mukaadial 6-O-alpha-L-rhamnopyranoside together wi
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::6832b4fd163f6302082e454ec2093237
https://doi.org/10.1016/s0031-9422(03)00105-5
https://doi.org/10.1016/s0031-9422(03)00105-5
Publikováno v:
Chemical and Pharmaceutical Bulletin. 51:479-482
From the resins of Commiphora kua a novel bisabolene; 6-hydroxy-2-methyl-5-(5'-hydroxy-1'(R),5'-dimethylhex-3'-enyl)-phenol together with two new dammarane triterpenes, 3beta,16beta,20(S),25-tetrahydroxydammar-23-ene and 3beta-acetoxy-16beta,20(S),25
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::aa787895b0a02c6b4726784cff8b7d6b
https://doi.org/10.1248/cpb.51.479
https://doi.org/10.1248/cpb.51.479