Enzymatic and spectroscopic studies on the activation or inhibition effects by substituted phenolic compounds in the oxidation of aryldiamines and catechols catalyzed by Rhus vernicifera laccase

Condensation of β-aminocrotononitrile (2 a) with 4-hydroxycoumarin (1 a, X = O, R = R2 = H, R1 = OH) afforded the tricyclic compound 7 and the bicyclic compound 11a from 4-hydroxy-6-methyl-2-pyrone (4). Analogous compounds could not be obtained from 4-hydroxy-6-methyl-2-pyridone (5) or 4-hydroxycarbostyril (6) due to the failure of the resulting condensation products 12a and 13, respectively to undergo intramolecular cyclization. The structures assigned to 7, 11a, 12a, 18, as well as to 5-cyano-4,6-dimethyl-2-pyridone (14), obtained by self-condensation of β-aminocrotononitrile, were substantiated by spectroscopic studies.

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Spectroscopic studies of Rhus vernicifera and Polyporus versicolor laccase. Electronic structures of the copper sites

Journal of the American Chemical Society ◽

10.1021/ja00511a039 ◽

1979 ◽

Vol 101 (17) ◽

pp. 5038-5046 ◽

Cited By ~ 46

Author(s):

David M. Dooley ◽

Jill Rawlings ◽

John H. Dawson ◽

Philip J. Stephens ◽

Lars-Erik Andreasson ◽

...

Keyword(s):

Electronic Structures ◽

Spectroscopic Studies ◽

Copper Sites ◽

Rhus Vernicifera

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Reactivity, electrochemical, and spectroscopic studies of type 2 copper-depleted Rhus vernicifera laccase

Biochemistry ◽

10.1021/bi00297a011 ◽

1984 ◽

Vol 23 (2) ◽

pp. 241-247 ◽

Cited By ~ 7

Author(s):

R. Max Wynn ◽

David B. Knaff ◽

Robert A. Holwerda

Keyword(s):

Spectroscopic Studies ◽

Rhus Vernicifera

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Phytochemical Analysis and Traditional uses of two locally available Ficus species (beneghalensis and sycomorus)

Journal of The Faculty of Science and Technology ◽

10.52981/jfst.vi7.1074 ◽

2021 ◽

pp. 155-162

Author(s):

Sulieman Ahmed Gasim El Said ◽

Hatil Hashim EL-Kamali ◽

Yousra Omer EL-Desogi

Keyword(s):

Phenolic Compounds ◽

Thin Layer ◽

Traditional Medicine ◽

Thin Layer Chromatography ◽

Therapeutic Agent ◽

Spectroscopic Studies ◽

Phytochemical Analysis ◽

Chemical Reagent ◽

Chemical Basis ◽

Layer Chromatography

Two Ficus species that are commonly used in Sudanese Traditional Medicine for the management of various ailments were screened for their phytochemical groups using chemical reagent and Thin Layer Chromatography. Qualitative phytochemical tests were used to detect the presence of flavonoids, saponins, tannins, alkaloids, phenolic compounds and anthraquinones. Six compounds from F. benegalensis and seven from F. sycomorus quenching were reported from the various parts of these two plants. However , more number of compounds were found in the leaves. The data generated from this study have provided the chemical basis for wide use of F. sycomorus as therapeutic agent for treating various ailments. However, there is need to further carry out advanced hyphenated spectroscopic studies in order to elucidate the structure of these compounds. Furthermore, this data may be handy in probing of biochemistry of this plant in the future.

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