Издательство Taylor&Francis по журналам "Natural Product Letters"
Отображаемые элементы 1-20 из 204
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(Taylor & Francis Group, 1994-08-01)A new meliacin, 11α-hydroxy-12-norazadirachtin has been isolated from the seeds of Azadirachta indica. Structure has been assigned based on spectral data and comparison with its 11-β-epimer.
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(Taylor & Francis Group, 1995-01-01)(2Z)-4-Hydroxy-2-methyl-2-buten-1-yl-ß-D-glucopyranoside 1a and (2Z)-1-Hydroxy-2-methyl-2-buten-4-yl-ß-D-glucopyranoside 2a were identified in a glycosidic extract obtained from Riesling grapevine leaves by XAD-2 adsorption ...
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(Taylor & Francis Group, 1996-10-01)The seeds of Aframomum hanburyi have yielded a new cytotoxic acetylated dihydroflavonol,3-acetoxy-5,7-dihydroxy-4-methoxyflava-none (1) in addition to the known highly sweet 2R,3R-(+)-3-acetoxy-5,7,4′-trihydroxyflavanone ...
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(Taylor & Francis Group, 1996-08-01)Two novel bioactive acetogenins, 4-acetyl annonacin (1) and 4-acetyl xylomaticin (2), were isolated from the leaves and twigs of Asimina longifolia K. (Annonaceae) by directing the fractionation with the brine shrimp ...
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(Taylor & Francis Group, 1994-10-01)A new C19 diterpene alkaloid, 6-deacetyl-10-hydroxyperegrine was isolated from Delphinium peregrinum together with previously obtained compounds.
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(Taylor & Francis Group, 1995-04-01)Four 9,10-dihydrophenanthrene glucosides have been isolated from Juncus effusus and their structures confirmed on spectroscopic grounds and by semisynthesis. The results of a cytotoxic assay are also reported.
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(Taylor & Francis Group, 1993-07-01)Fully acetylated carbohydrate derivatives were used as C-sources instead of glucose for cultivation of Acetobacter xylinum. The resulting bacterial celluloses were analysed by IR-spectroscopy for possible incorporation of ...
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(Taylor & Francis Group, 1995-08-01)The macrocyclic lactone (S)-curvularin (7) was prepared in six steps starting from known (S)-2-(2-hydroxypropyl)l,3-dithiane (2). Key steps are the C-alkylation of a dianion derived from 2 with trimethyl 4-bromoorthobutyrate ...
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(Taylor & Francis Group, 1994-03-01)The action of sulfur monochloride on aryl tert-butyl disulfides in tetrahydrofuran led directly to benzopentathiepins in good yields. The reaction was applied to the synthesis of two benzopentathiepins 10a and 10b, varacin ...
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(Taylor & Francis Group, 1996-12-01)5,6-Dihydroxyindole (1a) was isolated by bioactivity-directed fractionation from fresh leaves of Rhaphidophora korthalsii. The unstable compound and its stable diacetate (1b) were characterized spectroscopically and confirmed ...
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(Taylor & Francis Group, 1993-12-01)Hetero Diels-Alder reaction of diene 7, obtained in four steps from aldehyde 4, with Troc-NO 8 produced the dihydro-2H-1,2-oxazine 9 in 48% yield. Conversion of this intermediate to the N-deprotected tosylate 10 followed ...
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(Taylor & Francis Group, 1993-09-01)Growth and alkaloid formation of hairy roots of Rauwolfia serpentina and Rauwolfia vomitoria were compared with that of well established cell suspension cultures of Rauwolfia serpentina and differentiated plants. Cell ...
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(Taylor & Francis Group, 1993-02-01)The aerial parts of Haplophyllum thesioides yielded a new alkaloid, thenaptosine [4,5-dimethoxy-11-metriylfuro(2,3-c)acridin-6(15H)-on] and a new coumarin, thesiolen (4-methoxyangelicin) in addition to known alkaloids, ...
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(Taylor & Francis Group, 1993-12-01)Four new alkaloids with an aspidofractinine skeleton, singapurensines A-D 6-9, have been isolated from Kopsia singapurensis (Apocynaceae) and their structure elucidated by spectral methods. They all possess an oxygen bridge ...
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Allylsilane-Based Annulations. Direct Stereoselective Syntheses Of (±)-Graveolide And (±)-Aromaticin(Taylor & Francis Group, 1992-11-01)An Allylsilane-Based Annulation Was Used To Construct A Functionalized Perhydroazulene. The C(1), C(5) And C(10) Stereocenters, Characteristic Of The Helenanolides, Were Established Using A Reductive Alkylation Strategy. ...
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(Taylor & Francis Group, 1995-05-01)With the advent of Electrospray HPLC/MS instruments and a database like NAPRALERT, a quick and easy method for the dereplication of natural products can now be achieved.
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(Taylor & Francis Group, 1993-07-01)Excentricine (1), a novel skeleton tetrahydroisoqinoline alkaloid possessing an eight-membered oxygen-heterocyclic ring, was isolated along with eight known alkaloids from the roots of Stephania excentrica. The structrue ...
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(Taylor & Francis Group, 1995-08-01)The oxidation of tyrosine ethyl ester and O-benzyl protected o-tyrosine methyl ester with either sodium tungstate/hydrogen peroxide or DMD gave the corresponding tyrosine oximes in high yields. Controlled bromination of ...
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(Taylor & Francis Group, 1993-05-01)Reaction of 2,3,4,6-tetra-O-benzylglucopyranose with tris (dimethylamino)phosphine and carbon tetrachloride in dichloromethane has generated glucopyranosyl chloride via tris(dimethylamino)alkoxyphosphonium chloride, which ...
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(Taylor & Francis Group, 1995-12-01)A new eunicellin-type diterpene (2) was isolated from the gorgonian Eunicella cavolini and its structure was proposed by means of spectroscopic data. Brine shrimp and fish lethalities of 2 are reported.
Отображаемые элементы 1-20 из 204