scholarly journals CHEMICAL CONSTITUENTS FROM POLYGONATUM KINGIANUM COLL. ET HEMSL. OF VIETNAM

2020 ◽  
Vol 58 (5) ◽  
pp. 549
Author(s):  
Lê Minh Hà
Keyword(s):  
Spectral Data ◽  
Nmr Spectra ◽  
Chemical Constituents ◽  
Dienoic Acid ◽  
2D Nmr ◽  
Ergosterol Peroxide ◽  
2D Nmr Spectra ◽  
First Time

Seven compounds, including two homoisoflavanones 3-(2ʹ-hydroxy-4ʹ-methoxy-benzyl)-5,7-dihydroxy-8-methyl-chroman-4-one (1), disporopsin (2) along with 2-O-methyl-α-D-fructofuranose (3), (E,E)-9-oxooctadeca-10,12-dienoic acid (4), 1-palmitoylglycerol (5), 5α,8α-ergosterol  peroxide (6),  daucosterol (7) were isolated from the rhizomes of Polygonatum kingianum of Vietnam. Their structures were determined by 1D and 2D NMR spectra and by comparison with the reported spectral data. Compounds 3, 4 and 6 are first reported from the genus Polygonatum. Compound 1 and 5 are reported for the first time from Polygonatum kingianum.

Study on Chemical Constituents of the Vietnamese Medicinal Plant Fissistigma petelotii

2009 ◽  
Vol 64 (3) ◽  
pp. 323-327 ◽  
Author(s):  
Tran Thi Phuong Thao ◽  
Nguyen Vu Anh ◽  
Ho Ngoc Anh ◽  
Tran Duc Quan ◽  
Tran Van Sung
Keyword(s):  
Medicinal Plant ◽  
Cinnamic Acid ◽  
Nmr Spectra ◽  
Chemical Constituents ◽  
Methyl Elaidate ◽  
2D Nmr ◽  
Methyl Cinnamate ◽  
2D Nmr Spectra ◽  
First Time

A new bisabolene derivative (1S*, 2R*, 4R*, 7R*, 10R*)-1,7,10,11-tetrahydroxy-1,7,11-trimethyl- 4,10(H)-2-O-cinnamoyl-bisabol-8(9)-ene (1), together with cinnamic acid (2), methyl cinnamate (3), sodium cinnamate (4) and methyl elaidate (5) have been isolated from the leaves and barks of Fissistigma petelotii. Sodium cinnamate (4) was isolated for the first time from the nature. The structures of these compounds were elucidated by analysis of their IR, MS, 1D and 2D NMR spectra.

scholarly journals CONTRIBUTE TO STUDY ON CHEMICAL CONSTITUENTS OF DESMODIUM GANGETICUM (L.) DC. OF VIETNAM

2019 ◽  
Vol 57 (1) ◽  
pp. 1
Author(s):  
Le Minh Ha ◽  
Ngo Thi Phuong ◽  
Do Thi Thanh Huyen ◽  
Duong Bich Ngoc ◽  
Nguyen Minh Nguyet ◽  
...  
Keyword(s):  
Ethyl Acetate ◽  
Nmr Spectra ◽  
Ethyl Acetate Extract ◽  
Chemical Constituents ◽  
2D Nmr ◽  
2D Nmr Spectra ◽  
First Time

From the ethyl acetate extract of the leaves of Desmodium gangeticum collected in Me Linh, Ha Noi, we isolated 5 compounds including luteolin (1), luteolin tetramethyl ether (2),  N,N-dimethyl tetradecane-1-amin (3), D-pinitol (4)  and stigmasterol (5). In which, luteolin (1) was isolated from Desmodium gangeticum for the first time, luteolin tetramethyl ether (2) and  N,N-dimethyl tetradecane-1-amin (3) were first isolated from genus Desmodium. Their structures were determined by 1D and 2D NMR spectra.

scholarly journals Chemical Constituents of the Marine Sponge Aaptos aaptos (Schmidt, 1864) and Their Cytotoxic Activity

2021 ◽  
Vol 16 (2) ◽  
pp. 1934578X2199334
Author(s):  
Do Thi Trang ◽  
Bui Huu Tai ◽  
Dan Thuy Hang ◽  
Pham Hai Yen ◽  
Phan Thi Thanh Huong ◽  
...  
Keyword(s):  
Cytotoxic Activity ◽  
Spectral Data ◽  
Absolute Configuration ◽  
Marine Sponge ◽  
Chemical Constituents ◽  
2D Nmr ◽  
Extensive Analysis ◽  
First Time ◽  
Tddft Method ◽  
Mcf 7

Seven compounds (1-7) were isolated from the marine sponge Aaptos aaptos living in the Vietnamese sea. Their structures were determined as 2 hours, 5 H,7 H,9 H-9 S-hydroxy-imidazo[1,5- α]pyridine-1,3-dione (1), 3-([9-methylhexadecyl]oxy)propane-1,2-diol 2, 2,3-dihydro-2,3-dioxoaaptamine (3), indol-3-aldehyde (4), methyl indole-3-carboxylate (5) 4-hydroxy-5-(indole-3-yl)−5-oxo-pentan-2-one (6), and thymidine (7) by extensive analysis of HR-ESI-MS, 1D, and 2D NMR spectral data, as well as by comparison of the spectral data with those reported in the literature. In addition, the absolute configuration of 1 was determined from the experimental ECD spectrum and comparison of this with the theoretical ECD calculations using the TDDFT method. Compounds 1 and 2 were isolated from nature for the first time. Compound 3 induced cytotoxic activity against SK-LU-1, MCF-7, HepG2, and SK-Mel-2 cell lines with IC50 values of 41.27 ± 2.63, 40.70 ± 2.65, 34.31 ± 3.43, and 36.63 ± 1.40 µM, respectively.

scholarly journals Antialactone: A New γ-Lactone from Antiaris Africana, and its Absolute Configuration Determined from TDDFT CD Calculations

2008 ◽  
Vol 3 (2) ◽  
pp. 1934578X0800300 ◽  
Author(s):  
Vouffo Bertin ◽  
Hidayat Hussain ◽  
Simeon F. Kouam ◽  
Etienne Dongo ◽  
Gennaro Pescitelli ◽  
...  
Keyword(s):  
Natural Product ◽  
Absolute Configuration ◽  
Betulinic Acid ◽  
Spectroscopic Data ◽  
Nmr Spectra ◽  
2D Nmr ◽  
Stem Bark ◽  
Cd Spectra ◽  
2D Nmr Spectra ◽  
First Time

Four compounds were isolated from the stem bark of Antiaris africana. One of them, a γ-lactone named antialactone (1a), is reported for the first time as a natural product. The structures were determined by comprehensive analyses of their 1D and 2D NMR spectra and EI MS data. The absolute configuration of antialactone acetate (1b) was established by TDDFT CD calculations and comparison with measured CD spectra. The remaining three known compounds were identified, by comparing their spectroscopic data with those reported in the literature, as lichenxanthone, β-sitosterol, and betulinic acid.

scholarly journals (4S)-4,8-dihydroxy-1-tetralone and other chemical constituents from Pestalotiopsis sp. EJC07, endophytic fromBauhinia guianensis

2016 ◽  
Vol 88 (1) ◽  
pp. 29-33 ◽  
Author(s):  
Eleane M.C. de Souza ◽  
Ellon L. Da Silva ◽  
Andrey M.R. Marinho ◽  
Patrícia S.B. Marinho
Keyword(s):  
Spectral Methods ◽  
Chemical Constituents ◽  
2D Nmr ◽  
Hydroxybenzoic Acid ◽  
Ergosterol Peroxide ◽  
First Time

The present work reports the isolation of eight compounds fromPestalotiopsis sp. EJC07 isolated as endophytic fromBauhinia guianensis, a tipical plant of the Amazon. The compounds (4S)-4,8-dihydroxy-1-tetralone (1), uracil (2), uridin (3), p-hydroxybenzoic acid (4), ergosterol (5), ergosterol peroxide (6), cerevisterol (7) and ducitol (8) were isolated by chromatographic procedures and identified by spectral methods of 1D and 2D NMR and MS. The compound 1 is being reported for the first time in the genusPestalotiopsis.

scholarly journals Chemical constituents from the ethyl acetate and n-butanol extracts of the stems of Buchanania lucida Blume (Anacardiaceae)

2018 ◽  
Vol 1 (T5) ◽  
pp. 167-171
Author(s):  
Tung Thanh Nguyen ◽  
Thuong Thi Nguyen ◽  
Phu Hoang Dang ◽  
Trong Nguyen Huu Phan ◽  
Nhan Trung Nguyen
Keyword(s):  
Phenolic Compounds ◽  
Methyl Ester ◽  
Ethyl Acetate ◽  
Nmr Spectra ◽  
Chemical Structure ◽  
Chemical Constituents ◽  
2D Nmr ◽  
Published Data ◽  
2D Nmr Spectra ◽  
Aloe Emodin

There is no research on the chemical constituents investigation and bioactivity evaluation of Buchanania lucida Blume (Anacardiaceae). From the stems of Buchanania lucida collected at Dong Nai province, the ethyl acetate and n-butanol extracts were prepared. Four phenolic compounds: protocatechuic methyl ester (1), aloe-emodin (2), naringenin (3), and glucosyringic acid (4) were isolated from these extracts. The chemical structure of these compounds were elucidated by 1D and 2D NMR spectra and comparison with published data. These compounds were first reported in Buchanania lucida.

scholarly journals SOME GLYCOSIDES ISOLATED FROM DESMODIUM GANGETICUM (L.) DC. OF VIET NAM

2018 ◽  
Vol 56 (2A) ◽  
pp. 99-103
Author(s):  
Le Minh Ha
Keyword(s):  
Nmr Spectra ◽  
Protocatechuic Acid ◽  
Methanol Extract ◽  
2D Nmr ◽  
The Other ◽  
Viet Nam ◽  
2D Nmr Spectra ◽  
First Time

From the methanol extract of the leaves of Desmodium gangeticum collected in Me Linh, Ha Noi, we isolated 5 compounds. In which, there are four glycosides including (6S,9R)-roseoside (1), kaempferol-3-O-rutinoside (nicotiflorin) (2),  quercetin-3-O-rutinoside (rutin) (3), β-sitosterol-3-O- β-D-glucopyranoside (4), and the other is protocatechuic acid (5). Kaempferol-3-O-rutinoside (2) was isolated from Desmodium gangeticum for the first time while (6S,9R)-roseoside (1) was isolated from the genus Desmodium for the first time. Their structures were determined by 1D and 2D NMR spectra.

scholarly journals Two New Diphenylmethyl-substituted Xanthones from Securidaca longepedunculata

2014 ◽  
Vol 9 (5) ◽  
pp. 1934578X1400900 ◽  
Author(s):  
Dya Fita Dibwe ◽  
Suresh Awale ◽  
Shigetoshi Kadota ◽  
Hiroyuki Morita ◽  
Yasuhiro Tezuka
Keyword(s):  
Spectral Data ◽  
Nmr Spectra ◽  
Democratic Republic ◽  
Democratic Republic Of Congo ◽  
2D Nmr ◽  
Republic Of Congo ◽  
2D Nmr Spectra ◽  
Securidaca Longepedunculata

Two new diphenylmethyl-substituted xanthones, named muchimangins K (1) and L (2), have been isolated from the roots of Securidaca longepedunculata (Polygalaceae) collected in the Democratic Republic of Congo. Their structures were established by analyses of the spectral data, including 2D NMR spectra, to be l,3,6,8-tetrahydroxy-2,5-dimethoxy-4-[l-(2,4,5-trimethoxyphenyl)-1-phenylmethyl]xanthone (1) and l,3,6-trihydroxy-4,7-dimethoxy-2-[l-(2,4,5-trimethoxyphenyl)-1-phenylmethyl]xanthone (2).

scholarly journals A New Flavonol Glucoside from the Leaves of Crypsinus trilobus

2018 ◽  
Vol 13 (12) ◽  
pp. 1934578X1801301
Author(s):  
Pham Thi Bich Hanh ◽  
Ngo Thi Phuong ◽  
Le Ngoc Hung ◽  
Nguyen Quoc Dat ◽  
Dang Minh Tri ◽  
...  
Keyword(s):  
Nmr Spectra ◽  
2D Nmr ◽  
Esi Ms ◽  
2D Nmr Spectra ◽  
First Time

A new flavonol glucoside, kaempferol 3- O-[2″,4″-di- O-acetyl-6″- O-( E- p-coumaroyl)]-β-D-glucopyranoside (namely crypsinoside A) (1), along with 7 known compounds 2 – 8 were isolated from the leaves of Crypsinus trilobus (Houtt.) Copel. (Polypodiaceae) for the first time. Their structures were elucidated on the basis of HR-ESI-MS, 1D and 2D NMR spectra.

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