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1.
A new sesquiterpene (1) and two new pentacyclic triterpenoid esters (2, 3) together with three known compounds (4-6) were isolated from the fruits of Rhizophora mucronata. Their structures were elucidated by analysis of their spectroscopic data. The new compounds were characterized as 3-hydroxy-3,7,11-trimethyl-9-oxododeca-1,10-diene (mucronatone, 1), 3beta-E-caffeoyltaraxerol (2) and 3beta-Z-caffeoyltaraxerol (3). 相似文献
2.
Cheenpracha S Karalai C Rat-A-Pa Y Ponglimanont C Chantrapromma K 《Chemical & pharmaceutical bulletin》2004,52(8):1023-1025
A new cytotoxic cardenolide glycoside, 3beta-O-(2'-O-acetyl-alpha-L-thevetosyl)-14beta-hydroxy-7-en-5beta-card-20(22)-enolide, (7,8-dehydrocerberin), together with five known cardenolides, 17beta-neriifolin, deacetyltanghinin, tanghinin, cerberin and 2'-O-acetyl-cerleaside A were isolated from the seeds of Cerbera manghas L. Their structures were elucidated by 1D- and 2D-NMR techniques as well as UV, IR and mass spectral data. 7,8-Dehydrocerberin, deacetyltanghinin and tanghinin exhibited cytotoxic activities against oral human epidermoid carcinoma (KB), human breast cancer cell (BC) and human small cells lung cancer (NCI-H187). 相似文献
3.
Anwar Usman Suchada Chantrapromma Hoong‐Kun Fun Bo‐Long Poh Chatchanok Karalai 《Acta Crystallographica. Section C, Structural Chemistry》2002,58(1):o46-o47
In the title complex, the 1:1 ionic adduct of hexamethylenetetraminium and 2,4,6‐trinitrophenolate, C6H13N4+·C6H2N3O7?, the cation acts as a donor for bifurcated hydrogen bonds to the O atoms of the phenolate and one of the nitro groups of the 2,4,6‐trinitrophenolate anion. The crystal structure is built from sheets of cations and anions, and is stabilized by intermolecular C—H?O and C—H?π interactions. 相似文献
4.
Suchada Chantrapromma Anwar Usman Hoong‐Kun Fun Bo‐Long Poh Chatchanok Karalai 《Acta Crystallographica. Section C, Structural Chemistry》2002,58(9):o589-o590
In the title ternary complex, C10H9N2+·C7H3N2O6?·C7H4N2O6, the pyridinium cation adopts the role of the donor in an intermolecular N—H?O hydrogen‐bonding interaction with the carboxylate group of the 3,5‐dinitrobenzoate anion. The molecules of the ternary complex form molecular ribbons perpendicular to the b direction, which are stabilized by one N—H?O, one O—H?O and five C—H?O intermolecular hydrogen bonds. The ribbons are further interconnected by three intermolecular C—H?O hydrogen bonds into a three‐dimensional network. 相似文献
5.
Sarot Cheenpracha Chatchanok Karalai Chanita Ponglimanont Kan Chantrapromma Surat Laphookhieo 《Helvetica chimica acta》2006,89(5):1062-1066
A new dimer 1 and two new cassane‐type diterpenes 2 and 3 , designated taepeenin J–L, were isolated from the seeds of Caesalpinia crista L. Compound 1 possesses a dimeric vouacapane skeleton. Their structures were elucidated on the basis of spectroscopic analysis. 相似文献
6.
Micheal Glanzmann Chatchanok Karalai Bernd Ostersehlt Uwe Schön Christiane Frese Ekkehard Winterfeldt 《Tetrahedron》1982,38(18):2805-2810
The spirocyclization of straingt-chain triketo-intermediates, similar to possible biogenetic precursors of histrionicotoxin, is shown to be stereoselective, generating the non-natural configuration at C-2. Aiming at an sp2-center in this position, triketo-brassylic ester was treated with ammonia at room temperature and was shown to cleanly and efficiently yield a spiroketone. 相似文献
7.
Suchada Chantrapromma Hoong‐Kun Fun Ibrahim Abdul Razak Nisakorn Saewon Chatchanok Karalai Kan Chantrapromma 《Acta Crystallographica. Section C, Structural Chemistry》2000,56(12):e598-e599
In the title compound, C19H20O8, the benzene rings are nearly perpendicular to each other [dihedral angle 80.2 (2)°]. The carboxy group is twisted out while both the methoxy and acetyl groups are almost coplanar with their attached benzene rings. The hydroxy group is involved in an intramolecular O—H?O hydrogen bond with the acetyl O atom and the compound is connected through an intermolecular O—H?O contact to form a dimer. The crystal structure is stabilized by intermolecular O—H?O hydrogen bonds. 相似文献
8.
Orapun YodsaoueChatchanok Karalai Chanita PonglimanontSupinya Tewtrakul Suchada Chantrapromma 《Tetrahedron》2011,67(36):6838-6846
Bioactivity-guided isolation and purification of the dichloromethane extract from the roots of Caesalpinia pulcherrima yielded 15 new cassane-type diterpenes, named pulcherrins D-R (1-15) together with eight known compounds. The structures of the new metabolites were determined on the basis of spectroscopic analyses including 1D- and 2D-NMR and mass spectroscopy. The anti-inflammatory activity of isolated compounds was investigated with the lipopolysaccharide (LPS)-induced murine macrophage RAW 264.7 cell lines. Compounds 8, 9, 11-15, and 17-23 showed potent NO inhibitory activity. 相似文献
9.
Anwar Usman Suchada Chantrapromma Hoong‐Kun Fun Bo‐Long Poh Chatchanok Karalai 《Acta Crystallographica. Section C, Structural Chemistry》2002,58(1):o48-o50
In the title complex, C6H12N4·C8H8O3, the hexamethylenetetramine molecule accepts a single intermolecular O—H?N hydrogen bond from the hydroxy group of the 4‐hydroxy‐3‐methoxybenzaldehyde moiety. The non‐centrosymmetric crystal structure is built from alternating molecular sheets of 4‐hydroxy‐3‐methoxybenzaldehyde and hexamethylenetetramine molecules, and is stabilized by intermolecular O—H?N, C—H?O and C—H?π interactions. 相似文献
10.
Anwar Usman Suchada Chantrapromma Hoong‐Kun Fun Bo‐Long Poh Chatchanok Karalai 《Acta Crystallographica. Section C, Structural Chemistry》2002,58(3):o136-o138
In the title 1/2/2 adduct, C4H12N22+·2C6H3N2O5?·2H2O, the dication lies on a crystallographic inversion centre and the asymmetric unit also has one anion and one water molecule in general positions. The 2,4‐dinitrophenolate anions and the water molecules are linked by two O—H?O and two C—H?O hydrogen bonds to form molecular ribbons, which extend along the b direction. The piperazine dication acts as a donor for bifurcated N—H?O hydrogen bonds with the phenolate O atom and with the O atom of the o‐nitro group. Six symmetry‐related molecular ribbons are linked to a piperazine dication by N—H?O and C—H?O hydrogen bonds. 相似文献