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51
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Ibrahim MB, Shakil Hussain S, Fazal A, Fettouhi M, El Ali B. Effective palladium(II)-bis(oxazoline) catalysts: synthesis, crystal structure, and catalytic coupling reactions. J COORD CHEM 2015. [DOI: 10.1080/00958972.2014.995100] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
Affiliation(s)
- Mansur B. Ibrahim
- Chemistry Department, King Fahd University of Petroleum & Minerals, Dhahran, Saudi Arabia
| | - S.M. Shakil Hussain
- Center for Petroleum and Minerals, King Fahd University of Petroleum & Minerals, Dhahran, Saudi Arabia
| | - Atif Fazal
- Center of Research Excellence in Petroleum Refining, and Petrochemicals Research Institute, King Fahd University of Petroleum and Minerals, Dhahran, Saudi Arabia
| | - Mohammed Fettouhi
- Chemistry Department, King Fahd University of Petroleum & Minerals, Dhahran, Saudi Arabia
| | - Bassam El Ali
- Chemistry Department, King Fahd University of Petroleum & Minerals, Dhahran, Saudi Arabia
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52
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Bernini R, Pasqualetti M, Provenzano G, Tempesta S. Ecofriendly synthesis of halogenated flavonoids and evaluation of their antifungal activity. NEW J CHEM 2015. [DOI: 10.1039/c5nj00258c] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Chlorinated catechin derivative 29 resulted in being the most active compound against Trichoderma koningii and Cladosporium cladosporioides, common saprotrophic soil and seed fungi.
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Affiliation(s)
- Roberta Bernini
- Dipartimento di Scienze e Tecnologie per l'Agricoltura
- le Foreste
- la Natura e l'Energia (DAFNE)
- Università degli Studi della Tuscia
- 01100 Viterbo
| | - Marcella Pasqualetti
- Dipartimento di Scienze Ecologiche e Biologiche (DEB)
- Università degli Studi della Tuscia
- Largo dell'Università
- 01100 Viterbo
- Italy
| | - Gianfranco Provenzano
- Dipartimento di Scienze e Tecnologie per l'Agricoltura
- le Foreste
- la Natura e l'Energia (DAFNE)
- Università degli Studi della Tuscia
- 01100 Viterbo
| | - Sabrina Tempesta
- Dipartimento di Scienze Ecologiche e Biologiche (DEB)
- Università degli Studi della Tuscia
- Largo dell'Università
- 01100 Viterbo
- Italy
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53
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Nakamura K, Ohmori K, Suzuki K. The flavan–isoflavan rearrangement: bioinspired synthetic access to isoflavonoids via 1,2-shift–alkylation sequence. Chem Commun (Camb) 2015; 51:7012-4. [DOI: 10.1039/c5cc01572c] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
An approach to 2-substituted isoflavonoids is reported based on the 1,2-shift of the aryl group in the catechin skeleton followed by the in situ alkylation. Synthesis of (−)-equol, a natural isoflavan with estrogenic activities, was achieved.
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Affiliation(s)
- Kayo Nakamura
- Department of Chemistry
- Tokyo Institute of Technology
- Meguro
- Japan
| | - Ken Ohmori
- Department of Chemistry
- Tokyo Institute of Technology
- Meguro
- Japan
| | - Keisuke Suzuki
- Department of Chemistry
- Tokyo Institute of Technology
- Meguro
- Japan
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54
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Xu F, Peng L, Shinohara K, Morita T, Yoshida S, Hosoya T, Orita A, Otera J. Substituted 5,6,11,12-Tetradehydrodibenzo[a,e]cyclooctenes: Syntheses, Properties, and DFT Studies of Substituted Sondheimer–Wong Diynes. J Org Chem 2014; 79:11592-608. [DOI: 10.1021/jo502248p] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Affiliation(s)
- Feng Xu
- Department
of Applied Chemistry, Okayama University of Science, 1-1 Ridai-cho, Kita-ku, Okayama 700-0005, Japan
| | - Lifen Peng
- Department
of Applied Chemistry, Okayama University of Science, 1-1 Ridai-cho, Kita-ku, Okayama 700-0005, Japan
| | - Kenta Shinohara
- Department
of Applied Chemistry, Okayama University of Science, 1-1 Ridai-cho, Kita-ku, Okayama 700-0005, Japan
| | - Takamoto Morita
- Laboratory
of Chemical Bioscience, Institute of Biomaterials and Bioengineering, Tokyo Medical and Dental University, 2-3-10 Kanda-Surugadai, Chiyoda-ku, Tokyo 101-0062, Japan
| | - Suguru Yoshida
- Laboratory
of Chemical Bioscience, Institute of Biomaterials and Bioengineering, Tokyo Medical and Dental University, 2-3-10 Kanda-Surugadai, Chiyoda-ku, Tokyo 101-0062, Japan
| | - Takamitsu Hosoya
- Laboratory
of Chemical Bioscience, Institute of Biomaterials and Bioengineering, Tokyo Medical and Dental University, 2-3-10 Kanda-Surugadai, Chiyoda-ku, Tokyo 101-0062, Japan
| | - Akihiro Orita
- Department
of Applied Chemistry, Okayama University of Science, 1-1 Ridai-cho, Kita-ku, Okayama 700-0005, Japan
| | - Junzo Otera
- Department
of Applied Chemistry, Okayama University of Science, 1-1 Ridai-cho, Kita-ku, Okayama 700-0005, Japan
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55
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Pd-catalyzed atom-economic couplings of triarylbismuth reagents with 2-bromo- and 2,6-dibromochromones and synthesis of medicinally important fisetin. Tetrahedron Lett 2014. [DOI: 10.1016/j.tetlet.2014.08.081] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
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56
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Efficient synthesis of eriodictyol from L-tyrosine in Escherichia coli. Appl Environ Microbiol 2014; 80:3072-80. [PMID: 24610848 DOI: 10.1128/aem.03986-13] [Citation(s) in RCA: 63] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022] Open
Abstract
The health benefits of flavonoids for humans are increasingly attracting attention. Because the extraction of high-purity flavonoids from plants presents a major obstacle, interest has emerged in biosynthesizing them using microbial hosts. Eriodictyol is a flavonoid with anti-inflammatory and antioxidant activities. Its efficient synthesis has been hampered by two factors: the poor expression of cytochrome P450 and the low intracellular malonyl coenzyme A (malonyl-CoA) concentration in Escherichia coli. To address these issues, a truncated plant P450 flavonoid, flavonoid 3'-hydroxylase (tF3'H), was functionally expressed as a fusion protein with a truncated P450 reductase (tCPR) in E. coli. This allowed the engineered E. coli to produce eriodictyol from l-tyrosine by simultaneously coexpressing the fusion protein with tyrosine ammonia lyase (TAL), 4-coumarate-CoA ligase (4CL), chalcone synthase (CHS), and chalcone isomerase (CHI). In addition, metabolic engineering was employed to enhance the availability of malonyl-CoA so as to achieve a new metabolic balance and rebalance the relative expression of genes to enhance eriodictyol accumulation. This approach made the production of eriodictyol 203% higher than that in the control strain. By using these strategies, the production of eriodictyol from l-tyrosine reached 107 mg/liter. The present work offers an approach to the efficient synthesis of other hydroxylated flavonoids from l-tyrosine or even glucose in E. coli.
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57
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Shakil Hussain S, Ibrahim MB, Fazal A, Suleiman R, Fettouhi M, El Ali B. Palladium–bis(oxazoline) complexes with inherent chirality: Synthesis, crystal structures and applications in Suzuki, Heck and Sonogashira coupling reactions. Polyhedron 2014. [DOI: 10.1016/j.poly.2013.12.023] [Citation(s) in RCA: 52] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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