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Xu W, Huang JJ, Shao BH, Xu XJ, Jiang RW, Yuan M. X-ray Crystallography, DFT Calculations and Molecular Docking of Indole-Arylpiperazine Derivatives as α1A-Adrenoceptor Antagonists. Molecules 2015; 20:19674-89. [PMID: 26528963 PMCID: PMC6332402 DOI: 10.3390/molecules201119651] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2015] [Accepted: 10/16/2015] [Indexed: 01/22/2023] Open
Abstract
Indole-arylpiperazine derivatives have exhibited good selectivity for the α1A-adrenoceptor, but the structure-activity-binding mechanism relationship remains unclear. In the current study, three compounds (1, 2 and 3) were investigated through single-crystal X-ray diffraction analysis, density functional theory (DFT) calculations and molecular docking using a homology model of the α1A receptor. Compounds 1 and 3 form H-bonds networks to stabilize their three-dimensional structures, while C–H···π interactions play a significant role in the packing of 2. Based on DFT-optimized conformations, the HOMO-LUMO energy gaps and molecular electrostatic potential (MEP) were theoretically calculated at the B3LYP/6-311G (d, p) level of theory. Chemical reactivity increases in the order of 3 < 2 < 1, and the maximum positive region of the MEP maps is mainly localized over the NH group. The binding mechanisms of ligand-α1A-adrenoceptor complexes were illustrated by molecular docking. Binding to Gln177 of the second extracellular loop region via hydrogen bonds is likely to be essential for α1A-selective antagonists. The present work sheds light on the studies of structure-activity-binding mechanism and aids in the design of α1A antagonists with high selectivity.
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Li L, Duan WL, Tong J, Fu YQ, Zhang RR, Jiang RW, Guo F. Syntheses, structures and properties of four second-sphere coordination complexes via metal halide anion and naphthalene-based ligand. J COORD CHEM 2015. [DOI: 10.1080/00958972.2015.1074683] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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Jia F, He Z, Yang LP, Pan ZS, Yi M, Jiang RW, Jiang W. Oxatub[4]arene: a smart macrocyclic receptor with multiple interconvertible cavities. Chem Sci 2015; 6:6731-6738. [PMID: 29861922 PMCID: PMC5950800 DOI: 10.1039/c5sc03251b] [Citation(s) in RCA: 95] [Impact Index Per Article: 10.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2015] [Accepted: 09/11/2015] [Indexed: 01/02/2023] Open
Abstract
We report a smart macrocycle with four interconvertible cavities, which can select the best-fit cavity for a given guest.
There are a large number of synthetic macrocyclic receptors in the literature. No particular one is suitable for all guests or purposes. For a broader guest binding scope or multiple purposes, a macrocycle with multiple interconvertible cavities will be advantageous. Here, we report a naphthalene-based macrocyclic receptor with an adaptable cavity, namely oxatub[4]arene. It has four representative conformations resulting from the flipping of naphthalene rings, each with a deep and well-defined cavity. Different guests select one host conformer or a combination of conformers. All the four conformers have been detected and characterized based on 2D NMR spectra and X-ray single crystal structures. Thermodynamically, these conformers constitute a reservoir, that responds to the structural changes of guests, and thus maximizes the association free energies. This smart macrocycle may provide a new platform for the construction of molecular machines and devices or stimuli-responsive materials.
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Zhang W, Huang XJ, Zhang SY, Zhang DM, Jiang RW, Hu JY, Zhang XQ, Wang L, Ye WC. Geleganidines A-C, Unusual Monoterpenoid Indole Alkaloids from Gelsemium elegans. JOURNAL OF NATURAL PRODUCTS 2015; 78:2036-2044. [PMID: 26222693 DOI: 10.1021/acs.jnatprod.5b00351] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
The first rotameric monoterpenoid indole alkaloids (MIAs), 1a and 1b, and two unusual dimeric MIAs, 2 and 3, with new dimerization patterns, together with their putative biosynthetic intermediates 4-7, were isolated from the roots of Gelsemium elegans. Compounds 2 and 3 represent the first natural aromatic azo- and the first urea-linked dimeric MIAs, respectively. Their structures and absolute configurations were elucidated by means of NMR spectroscopy, single-crystal X-ray diffraction, and electronic circular dichroism data analyses. The interconverting mechanism of rotamers 1a and 1b was studied by density functional theory computation. Compounds 2 and 3 showed moderate cytotoxic activity against MCF-7 and PC-12 cells, respectively. In addition, a plausible biosynthesis pathway for the new alkaloids was proposed on the basis of the coexistence of their biosynthetic precursors.
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Zhang Y, Tian HY, Tan YF, Wong YL, Wu HY, Jia JF, Wang GE, Gao JJ, Li YF, Kurihara H, Shaw PC, Jiang RW. Isolation and identification of polyphenols from Marsilea quadrifolia with antioxidant properties in vitro and in vivo. Nat Prod Res 2015. [PMID: 26222269 DOI: 10.1080/14786419.2015.1062377] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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Jian YQ, Huang XJ, Zhang DM, Jiang RW, Chen MF, Zhao BX, Wang Y, Ye WC. Guapsidial A and Guadials B and C: Three New Meroterpenoids with Unusual Skeletons from the Leaves of Psidium guajava. Chemistry 2015; 21:9022-7. [PMID: 25965842 DOI: 10.1002/chem.201500533] [Citation(s) in RCA: 42] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/09/2015] [Indexed: 11/06/2022]
Abstract
A novel sesquiterpene-based Psidium meroterpenoid, possessing an unusual coupling pattern, and two new monoterpene-based meroterpenoids with unprecedented skeletons were isolated from the leaves of Psidium guajava. Their structures and absolute configurations were elucidated by spectroscopic, X-ray diffraction, and computational methods. The plausible biosynthetic pathway of these meroterpenoids as well as their cytotoxicities toward HepG2 and HepG2/ADM cells were also discussed.
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Zhang RR, Lu DY, Yang ZY, Zhao W, But PPH, Shaw PC, Jiang RW, Ma ZG. Simultaneous quantification of six alkaloid components from commercial stemonae radix by solid phase extraction-high-performance liquid chromatography coupled with evaporative light scattering detector. Pharmacogn Mag 2015; 11:360-7. [PMID: 25829776 PMCID: PMC4378135 DOI: 10.4103/0973-1296.153090] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/28/2014] [Revised: 06/09/2014] [Accepted: 03/12/2015] [Indexed: 11/04/2022] Open
Abstract
BACKGROUND Stemonae radix has been applied in traditional Chinese medicine for centuries. Alkaloids are the main active ingredient in stemonae radix, so their composition and concentration levels are directly linked to clinic effects. OBJECTIVE The objective was to develop an analytical method with multiple markers for quality survey of commercial stemonae radix. MATERIALS AND METHODS A method for simultaneous determination of six compounds in commercial stemonae radix was performed using solid-phase extraction and high-performance liquid chromatography coupled with evaporative light scattering detector. The separation was carried out on an Agilent TC-C18 column with 0.1% acetonitrile solution of triethylamine aqueous solution and acetonitrile as the mobile phase under gradient elution within 70 min. The hierarchical clustering analysis (HCA) was successfully used to classify the samples in accordance with their chemical constituents. RESULTS Linearity (R(2) > 0.9990), intra- and inter-day precision (relative standard deviations <4%), limit of detection (0.011-0.086 μg/mL), limit of quantification (0.033-0.259 μg/mL) of the six alkaloids were determined, and the recoveries were between 96.6% and 103.7%. The method was successfully applied to analysis 36 batches of commercial stemonae radix. All the samples could be classified into five clusters by HCA. CONCLUSION This article provides an accurate and simple analytical method for quality survey of commercial stemonae radix. Because of the significant chemical variations, careful selection of Stemona sources with obvious antitussive value but devoid of croomine followed by good agricultural practice and good manufacturing practice process is suggested.
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Li J, Feng J, Luo C, Herman HYS, Jiang RW. Absolute configuration of podophyllotoxone and its inhibitory activity against human prostate cancer cells. Chin J Nat Med 2015; 13:59-64. [PMID: 25660289 DOI: 10.1016/s1875-5364(15)60007-3] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/20/2014] [Indexed: 11/24/2022]
Abstract
Podophyllotoxone (1) was isolated from the roots of Dysosma versipellis. The structure was determined by spectroscopic analysis in combination with single-crystal X-ray analysis. The absolute configuration of compound 1 was assigned based on the Flack parameter. It showed significant inhibitory activities against human prostate cancer cells PC3 and DU145 with IC50 values being 14.7 and 20.6 μmol·L(-1), respectively. It also arrested the cells at G2/M phase. Tubulin polymerization assay showed that it inhibited the tubulin polymerization in a dose-dependent manner, and molecular docking analysis revealed a different binding mode with tubulin as compared with those known tubulin inhibitors.
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Zhang JL, Chen ZH, Xu J, Li J, Tan YF, Zhou JH, Ye WC, Tian HY, Jiang RW. New structures, chemotaxonomic significance and COX-2 inhibitory activities of cassane-type diterpenoids from the seeds of Caesalpinia minax. RSC Adv 2015. [DOI: 10.1039/c5ra14221k] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Eleven new cassane-type diterpenoids, and twelve known compounds were isolated from the seeds of Caesalpinia minax Hance. Some of them displayed potent inhibitory activity against COX-2 through hydrogen bonding and π–π interactions.
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Chen YP, Liu Q, Gao H, Lin HP, Tian HY, Hong K, Li J, Jiang RW, Yao XS, Tang JS. Streptospirodienoic acids A and B, 6,6-spiroketal polyketides from Streptomyces sp. RSC Adv 2014. [DOI: 10.1039/c4ra10672e] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
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Zhang RR, Tian HY, Wu Y, Sun XH, Zhang JL, Ma ZG, Jiang RW. Isolation and chemotaxonomic significance of stenine- and stemoninine-type alkaloids from the roots of Stemona tuberosa. CHINESE CHEM LETT 2014. [DOI: 10.1016/j.cclet.2014.03.051] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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Tang BQ, Wang WJ, Huang XJ, Li GQ, Wang L, Jiang RW, Yang TT, Shi L, Zhang XQ, Ye WC. Iboga-Type Alkaloids from Ervatamia officinalis. JOURNAL OF NATURAL PRODUCTS 2014; 77:1839-1846. [PMID: 25093992 DOI: 10.1021/np500240b] [Citation(s) in RCA: 51] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
Seven new iboga-type alkaloids, ervaoffines A-D (1-4), (7S)-3-oxoibogaine hydroxyindolenine (5), ibogaine-5,6-dione (6), and 19-epi-5-oxovoacristine (7), and 10 known alkaloids were isolated from Ervatamia officinalis. The absolute configurations of 1-7 were determined through X-ray diffraction and electronic circular dichroism (ECD) analyses. Ervaoffines A and B represent the first iboga-type pseudoindoxyl alkaloids in which the C-2 spiro carbon configuration is opposite to that of other members of this class, such as iboluteine (8). The relationship between the absolute configuration of the spiro carbons and the Cotton effect in the ECD spectrum is established for the first time for iboga-type pseudoindoxyl and oxindole alkaloids. Additionally, a plausible biogenetic pathway for these alkaloids is proposed.
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Zhang ZR, Li JH, Li S, Liu AL, Hoi PM, Tian HY, Ye WC, Lee SMY, Jiang RW. In vivo angiogenesis screening and mechanism of action of novel tanshinone derivatives produced by one-pot combinatorial modification of natural tanshinone mixture from Salvia miltiorrhiza. PLoS One 2014; 9:e100416. [PMID: 24992590 PMCID: PMC4081027 DOI: 10.1371/journal.pone.0100416] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/21/2013] [Accepted: 05/28/2014] [Indexed: 12/13/2022] Open
Abstract
Background Natural products present in low quantity in herb medicines constitute an important source of chemical diversity. However, the isolation of sufficient amounts of these low abundant constituents for structural modification has been a challenge for several decades and subsequently halts research on the utilization of this important source of chemical entities for drug discovery and development. And, pro-angiogenic therapies are being explored as options to treat cardio-cerebral vascular diseases and wound healing recently. The present study investigates the pro-angiogenic potential of tanshinone derivatives produced by one-pot synthesis using zebrafish model. Methodology/Principal Findings In order to address the difficulty of chemical modification of low abundant constituents in herb medicines, a novel one-pot combinatorial modification was used to diversify a partially purified tanshinone mixture from Salvia miltiorrhiza. This led to the isolation of ten new imidazole-tanshinones (Compounds 1–10) and one oxazole-tanshinone (Compound 11), the structures of which were characterized by spectroscopic methods in combination with single-crystal X-ray crystallographic analysis. The angiogenesis activities of the new tanshinone derivatives were determined in an experimental model of chemical-induced blood vessels damage in zebrafish. Of all the tested new derivatives, compound 10 exhibited the most potent vascular protective and restorative activity with an EC50 value of 0.026 µM. Moreover, the mechanism underlying the pro-angiogenesis effect of 10 probably involved the VEGF/FGF-Src-MAPK and PI3K-P38 signalling pathways by gene expression analysis and a blocking assay with pathways-specific kinase inhibitors. Conclusions/Significance Taken together, our study demonstrated the more distinctive pro-angiogenic properties of 10 than other tanshinones and revealed 10 has potential for development as a pro-angiogenic agent for diseases associated with insufficient angiogenesis. Our results highlighted the great potential of adopting a newly modified one-pot approach to enhance the chemical diversity and biological activities of constituents from natural products regardless of their abundances.
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Tian HY, Zhang PW, Liu JS, Zhang DM, Zhang XQ, Jiang RW, Ye WC. New cytotoxic C-3 dehydrated bufadienolides from the venom of Bufo bufo gargarizans. CHINESE CHEM LETT 2014. [DOI: 10.1016/j.cclet.2014.02.006] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Zhou L, Zhao BX, Jiang RW, Huang XJ, Wu ZL, Wang Y, Ye WC. Securinega alkaloids from the fruits of Flueggea suffruticosa. JOURNAL OF ASIAN NATURAL PRODUCTS RESEARCH 2014; 16:593-601. [PMID: 24957326 DOI: 10.1080/10286020.2014.930443] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/11/2014] [Accepted: 05/29/2014] [Indexed: 06/03/2023]
Abstract
Phytochemical investigation on the fruits of Flueggea suffruticosa resulted in the isolation of three new Securinega alkaloids, secu'amamine H (1), 15β-methoxy-14,15-dihydrosecurinine (3), and securinol E (7), as well as eight known ones (2, 4-6, and 8-11). Their structures were elucidated by means of spectroscopic techniques (1D and 2D NMR, MS, UV, and IR). The absolute configurations of the new compounds were established by single-crystal X-ray diffraction and CD analyses.
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Tang HJ, Yuan XF, Tian HY, Ruan LJ, Jiang RW. De-acetyl-cinobufalactam monohydrate. Acta Crystallogr Sect E Struct Rep Online 2014; 70:o651-2. [PMID: 24940236 PMCID: PMC4051091 DOI: 10.1107/s1600536814010046] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/25/2014] [Accepted: 05/05/2014] [Indexed: 11/24/2022]
Abstract
The title compound, C24H33NO4·H2O, the reaction product of deacetylcinobufagin with ammonium acetate, consists of three cyclohexane rings (A, B and C), one five-membered ring (D), one six-membered lactone ring (E) and an epoxide ring (F). The stereochemistry of the ring junctures are A/B cis, B/C trans, C/D cis and D/F cis. Cyclohexane rings A, B and C have normal chair conformations. The five-membered ring D adopts an envelope conformation (with the C atom bearing the lactone ring as the flap) and the lactone ring E is planar. In the crystal, hydroxy and water O—H⋯O and amine N—H⋯O hydrogen bonds involving carbonyl, hydroxy and water O-atom acceptors link the molecules into a three-dimensional network.
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Feng J, Zhang JL, Zhang RR, Ruan LJ, Jiang RW. 1-Deacet-oxy-1-oxocaesalmin. Acta Crystallogr Sect E Struct Rep Online 2014; 70:o662. [PMID: 24940245 PMCID: PMC4051044 DOI: 10.1107/s1600536814011040] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/06/2014] [Accepted: 05/13/2014] [Indexed: 11/29/2022]
Abstract
The title compound, C24H30O7, is a diterpenoid isolated from the seeds of Caesalpinia minax. It consists of two cyclohexane rings (A and B), one unsaturated six-membered ring (C) and one furan ring (D). The stereochemistry of the ring junctures is A/B trans and B/C trans. Rings A and B have normal chair conformations while C adopts a twisted half-chair conformation due to fusion to the furan ring which is planar [r.m.s. deviation = 0.0009 (2) Å]. In the crystal, hydroxyl O—H⋯Ocarbonyl hydrogen bonds link the molecules into a chain structure extending along the a-axis direction.
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Wu ZL, Zhao BX, Huang XJ, Tang GY, Shi L, Jiang RW, Liu X, Wang Y, Ye WC. Suffrutines A and B: A Pair ofZ/EIsomeric Indolizidine Alkaloids from the Roots ofFlueggea suffruticosa. Angew Chem Int Ed Engl 2014. [DOI: 10.1002/ange.201400048] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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Wu ZL, Zhao BX, Huang XJ, Tang GY, Shi L, Jiang RW, Liu X, Wang Y, Ye WC. Suffrutines A and B: a pair of Z/E isomeric indolizidine alkaloids from the roots of Flueggea suffruticosa. Angew Chem Int Ed Engl 2014; 53:5796-9. [PMID: 24729281 DOI: 10.1002/anie.201400048] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/03/2014] [Indexed: 11/11/2022]
Abstract
Suffrutines A (1) and B (2), a pair of novel photochemical Z/E isomeric indolizidine alkaloids, with a unique and highly conjugated C20 skeleton, were isolated from the roots of Flueggea suffruticosa. The structures were elucidated by extensive analysis of NMR spectra and single-crystal X-ray diffraction. The light-induced isomerization and hypothetical biogenetic pathway to 1 and 2, as well as their activity for regulating the morphology of Neuro-2a cells are also discussed.
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Cheng W, Tan YF, Tian HY, Gong XW, Chen KL, Jiang RW. Two new bufadienolides from the rhizomes ofHelleborus thibetanuswith inhibitory activities against prostate cancer cells. Nat Prod Res 2014; 28:901-8. [DOI: 10.1080/14786419.2014.891200] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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71
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Luo SL, Huang XJ, Wang Y, Jiang RW, Wang L, Bai LL, Peng QL, Song CL, Zhang DM, Ye WC. Isocoumarins from American cockroach (Periplaneta americana) and their cytotoxic activities. Fitoterapia 2014; 95:115-20. [PMID: 24631766 DOI: 10.1016/j.fitote.2014.03.004] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/21/2014] [Revised: 02/26/2014] [Accepted: 03/02/2014] [Indexed: 11/16/2022]
Abstract
Four new isocoumarins (1-4), along with three known ones (5-7), were isolated from the 70% ethanol extract of the whole body of the traditional Chinese insect medicine, American cockroach (Periplaneta americana). The structures with absolute configurations of new compounds were elucidated by extensive spectroscopic methods in combination with X-ray diffraction experiment and CD analyses. Compounds 3-5 showed significant cytotoxic activities in HepG2 and MCF-7 cells with IC50 values in the ranges 6.41-23.91 μM and 6.67-39.07 μM, respectively.
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Zhang PW, Jiang RW, Ye WC, Tian HY. [Bufadienolides from venom of Bufo bufo gargarizans]. ZHONGGUO ZHONG YAO ZA ZHI = ZHONGGUO ZHONGYAO ZAZHI = CHINA JOURNAL OF CHINESE MATERIA MEDICA 2014; 39:841-845. [PMID: 25204176] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
Twelve compounds were isolated from the venom of Bufo bufo gargarizans. On the basis of their physical and chemical properties and spectral data, their structures were identified as resibufagenin (1), bufotalin (2), desacetylcinobufagin (3), 19-oxodesacetylcinobufotalin (4), cinobufotalin (5), 1beta-hydroxylbufalin (6), 12alpha-hydroxybufalin (7), bufotalinin (8), Hellebrigenin (9), telocinobufagin (10), hellebrigenol (11) and cinobufagin-3-hemisuberate methyl ester (12), respectively. Compounds 7 and 12 are new natural products.
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Yuan XF, Tian HY, Li J, Jin L, Jiang ST, Liu KWK, Luo C, Middleton DA, Esmann M, Ye WC, Jiang RW. Synthesis of bufalin derivatives with inhibitory activity against prostate cancer cells. Nat Prod Res 2014; 28:843-7. [PMID: 24484199 DOI: 10.1080/14786419.2014.881363] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
Abstract
Bufalin possesses a strong anti-cancer effect, but the cardiac toxicity targeting the Na(+), K(+)-ATPase limits its application. Here, two bufalin derivatives, bufadienolactam (1) and secobufalinamide (2), were synthesised by treating bufalin with ammonium acetate in dimethylformamide solution. Their structures were elucidated by extensive spectroscopic methods. The structure of compound 2 was further confirmed by single-crystal X-ray diffraction analysis. Compounds 1 and 2 expressed strong inhibitory activities against androgen-dependent prostate cancer cells (IC₅₀ values about 10 μM), but only weak inhibition on Na(+), K(+)-ATPase (Ki about 70 μM), indicating that they might be potential anti-prostate cancer agents without severe cardiac toxicity.
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Jin L, Zhang RR, Tian HY, But PPH, Jiang RW. Epibisde-hydro-neotuberostemonine J. Acta Crystallogr Sect E Struct Rep Online 2014; 69:o1369-70. [PMID: 24427015 PMCID: PMC3884435 DOI: 10.1107/s1600536813021077] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/04/2013] [Accepted: 07/29/2013] [Indexed: 11/10/2022]
Abstract
The title compound, C22H29NO4, a stemona alkaloid, is composed of two lactone rings (A and E), a six-membered ring (B), a pyrrole ring (C) and a seven-membered ring (D). The five-membered rings A and E exhibit envelope conformations (C atoms as flaps) while ring C is planar. Ring B exhibits a twist-chair conformation due to fusion with pyrrole ring C while ring D adopts a chair conformation. The junction between rings A and B is cis. In the crystal, weak C—H⋯O interactions involving the two carbonyl groups, a methylene and a methyl group give rise to a three-dimensional network.
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Zhang JL, Tian HY, Chen NH, Bai XY, Li J, Zhang RR, Wu RB, Jiang RW. Caesalpinimin A, a novel rearranged furanoditerpene with an unprecedented carbon skeleton from the seeds of Caesalpinia minax Hance. RSC Adv 2014. [DOI: 10.1039/c3ra46502k] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
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