Results 71 to 80 of about 180 (108)

Novel transformations in the quassin series

Tetrahedron Letters, 1981
Abstract A series of remarkable rearrangement reactions involving (1β,9β)-1-methoxypicras-11-en-16-one and related derivatives are described.
P. A. Grieco, S. Ferrino, J. C. Huffman, E. Williams, VIDARI, GIOVANNI   +4 more
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ChemInform Abstract: Total Synthesis of (+)‐Quassin

ChemInform, 2001
AbstractChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.
Tony K. M. Shing, Qin Jiang
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Indole Alkaloids and Quassin from Quassia africana

Journal of Natural Products, 1986
info:eu-repo/semantics ...
Lumonadio, Luyengi, Vanhaelen, Maurice
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ChemInform Abstract: Semisynthetic Derivatives of Quassin.

ChemInform, 1998
AbstractChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.
C. C. LANG'AT, R. A. WATT, I. TOTH, J. D. PHILLIPSON   +3 more
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A partial synthesis of (-)-shinjulactone H from (+)-quassin

The Journal of Organic Chemistry, 1992
A partial synthesis of (-)-shinjulactone H (3) from (+)-quassin (1) required the selective manipulation of two similar O-methyldiosphenol groups. Protection of the δ-lactone in 1 as an ortho ester, selective reduction of the C-1 carbonyl group, hydrolysis of the resulting enol ether in the A ring, and catalytic hydrogenation of the O-methyldiosphenol ...
Hideo Nakamura, Sundar Vasudevan, Moonsun Kim, Carolyn P. Brock, David S. Watt   +4 more
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Enhancement of the Antiplasmodial Activity of Quassin by Transformation into a γ-Lactone

Journal of Natural Products, 2003
The naturally occurring bitter principle quassin (1) was converted chemically into the gamma-lactone quassilactone (13) in an attempt to enhance its antiplasmodial activity. The in vitro antiplasmodial activity of 13 against Plasmodium falciparum (K1) (IC(50) = 23 microM) was 40-fold greater than that of 1. However, one of the intermediates, compound 8,
Wright, Colin W., Kirby, G.C, Phillipson, J.D, Warhurst, D.C., Lang'at-Thoruwa, C., Watt, R.A.   +5 more
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ChemInform Abstract: Unexpected Rearrangement in the Quassin Series.

ChemInform, 1988
AbstractOxidation of the alcohol (II) according to A) affords the hemiacetal (I) instead of the expected quassin (III).
P. CECCHERELLI, M. CURINI, M. C. MARCOTULLIO, G. GRANDOLINI   +3 more
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ChemInform Abstract: CONVERSION OF QUASSIN INTO 15β‐((E)‐3,4‐DIMETHYL‐2‐PENTENOYLOXY)QUASSIN. A D‐RING ANALOG OF BRUCEANTIN

Chemischer Informationsdienst, 1981
AbstractDie Umwandlung von Quassin (I) zu der Titelverbindung (VII) erfolgt wie aufgezeichnet in fünf Stufen.
T. MURAE, T. TAKAHASHI
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Growth of and quassin accumulation by cultures of Quassia amara

Plant Cell Tissue and Organ Culture (PCTOC), 1990
Callus and suspension cultures were established from Quassia amara, a member of the Simaroubaceae. Analysis of the tissue culture showed that quassin was present in both callus and suspension cultures. The effect of variation in auxin and cytokinins on both callus growth and the presence of quassin was examined.
A. H. Scragg, S. Ashton, R. D. Steward, E. J. Allan   +3 more
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ChemInform Abstract: Total Synthesis of d,l‐Quassin.

ChemInform, 1991
AbstractChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.
N. STOJANAC, Z. VALENTA
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