Výsledky vyhledávání - "Gilbert L. Boye"

Isolation of Echinocystic Acid-3-O-Sulfate, a New Triterpene, from Tetrapleura tetraptera, and Evaluation of the Mutagenic Potential of Molluscicidal Extracts and Isolates

Autor: Olipa Ngassapa, Gilbert L. Boye, Thomas O. Henderson, Norman R. Farnsworth, Chris Beecher, John M. Pezzuto

Publikováno v: Journal of Natural Products. 56:1872-1877

A known triterpene glycoside, 3-O-[beta-D-glucopyranosyl-(1"-6')-2'-acetamido-2'-deoxy-beta-D-gluco pyranosyl]olean-12-en-28-oic acid [3], and new sulfated triterpene, echinocystic acid-3-O-sodium sulfate [4], have been isolated from the stem bark of

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::10ae68083db823521f783eefe97c9a16
https://doi.org/10.1021/np50101a002

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Cryptospirolepine, a Unique Spiro-nonacyclic Alkaloid Isolated from Cryptolepis sanguinolenta

Autor: Ronald C. Crouch, Timothy D. Spitzer, Maged H. M. Sharaf, Robert L. Johnson, Doug Minick, Paul L. Schiff, A.N. Tackie, John Dunn, Gary E. Martin, Gilbert L. Boye

Publikováno v: Journal of Natural Products. 56:653-670

From the alkaloidal fractions of the West African plant Cryptolepis sanguinolenta (Asclepiadaceae), two alkaloids were purified: one was identified as the known indoloquinoline alkaloid cryptolepine [1]. A second, novel alkaloid has shown to have an

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::17f514dd9d6205e31fbde915bdd3ff77
https://doi.org/10.1021/np50095a001

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Total assignment of the proton and carbon NMR spectra of the alkaloid quindoline - utilization of HMQC-TOCSY to indirectly establish protonated carbon-protonated carbon connectivities

Autor: Paul L. Schiff, Albert N. Tackie, Timothy D. Spitzer, Gary E. Martin, Gilbert L. Boye, Maged H. M. Sharaf, Ronald C. Crouch

Publikováno v: Journal of Heterocyclic Chemistry. 28:2065-2070

The reisolation of the indoloquinoline alkaloid quindoline (also known as norcryptolepine) from Cryptolepis sanguinolenta is reported. The structure was unequivocally confirmed by two-dimensional nmr methods; the proton and carbon spectra were assign

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::34044ca2687f26f404684677c8736865
https://doi.org/10.1002/jhet.5570280850

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Assignment of the proton and carbon NMR spectra of the indoloquinoline alkaloid cryptolepine

Autor: A.N. Tackie, Paul L. Schiff, Gilbert L. Boye, Maged H. M. Sharaf, Ronald C. Crouch, Gary E. Martin

Publikováno v: Journal of Heterocyclic Chemistry. 28:1429-1435

The relatively rare alkaloid cryptolepine, 5-methyl-5H-indolo[3,2-b]quinoline, was isolated from Cryptolepis sanguinolenta (Lindl.) Schlecter (Asclepiadaceae). Unequivocal proton and carbon nmr assignments in dimethyl sulfoxide are reported based on

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::473ddda54de202523ea22864bf50c6dc
https://doi.org/10.1002/jhet.5570280540

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