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Wu Z, Wang W, Li J, Ma C, Chen L, Che Q, Zhang G, Zhu T, Li D. Evolution-Based Discovery of Polyketide Acylated Valine from a Cytochalasin-Like Gene Cluster in Simplicillium lamelliciola HDN13430. JOURNAL OF NATURAL PRODUCTS 2024; 87:1222-1229. [PMID: 38447096 DOI: 10.1021/acs.jnatprod.3c01202] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 03/08/2024]
Abstract
Utilizing a gene evolution-oriented approach for gene cluster mining, a cryptic cytochalasin-like gene cluster (sla) in Antarctic-derived Simplicillium lamelliciola HDN13430 was identified. Compared with the canonical cytochalasin biosynthetic gene clusters (BGCs), the sla gene cluster lacks the key α,β-hydrolase gene. Heterologous expression of the sla gene cluster led to the discovery of a new compound, slamysin (1), characterized by an N-acylated amino acid structure and demonstrating weak anti-Bacillus cereus activity. These findings underscore the potential of genetic evolution in uncovering novel compounds and indicating specific adaptive evolution within specialized habitats.
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Affiliation(s)
- Zuodong Wu
- Key Laboratory of Marine Drugs, Chinese Ministry of Education, School of Medicine and Pharmacy, Sanya Oceanographic Institute, Ocean University of China, Sanya, Hainan 572025, People's Republic of China
| | - Wenxue Wang
- Key Laboratory of Marine Drugs, Chinese Ministry of Education, School of Medicine and Pharmacy, Sanya Oceanographic Institute, Ocean University of China, Sanya, Hainan 572025, People's Republic of China
| | - Jilong Li
- Key Laboratory of Marine Drugs, Chinese Ministry of Education, School of Medicine and Pharmacy, Sanya Oceanographic Institute, Ocean University of China, Sanya, Hainan 572025, People's Republic of China
| | - Chuanteng Ma
- Key Laboratory of Marine Drugs, Chinese Ministry of Education, School of Medicine and Pharmacy, Sanya Oceanographic Institute, Ocean University of China, Sanya, Hainan 572025, People's Republic of China
| | - Liangzhen Chen
- Qingdao Vland Biotech Group Co., Ltd. Qingdao, Shandong 266102, People's Republic of China
| | - Qian Che
- Key Laboratory of Marine Drugs, Chinese Ministry of Education, School of Medicine and Pharmacy, Sanya Oceanographic Institute, Ocean University of China, Sanya, Hainan 572025, People's Republic of China
| | - Guojian Zhang
- Key Laboratory of Marine Drugs, Chinese Ministry of Education, School of Medicine and Pharmacy, Sanya Oceanographic Institute, Ocean University of China, Sanya, Hainan 572025, People's Republic of China
- Laboratory for Marine Drugs and Bioproducts, Laoshan Laboratory, Qingdao, Shandong 266237, People's Republic of China
| | - Tianjiao Zhu
- Key Laboratory of Marine Drugs, Chinese Ministry of Education, School of Medicine and Pharmacy, Sanya Oceanographic Institute, Ocean University of China, Sanya, Hainan 572025, People's Republic of China
| | - Dehai Li
- Key Laboratory of Marine Drugs, Chinese Ministry of Education, School of Medicine and Pharmacy, Sanya Oceanographic Institute, Ocean University of China, Sanya, Hainan 572025, People's Republic of China
- Laboratory for Marine Drugs and Bioproducts, Laoshan Laboratory, Qingdao, Shandong 266237, People's Republic of China
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Kamil M, Fatima A, Ullah S, Ali G, Khan R, Ismail N, Qayum M, Irimie M, Dinu CG, Ahmedah HT, Cocuz ME. Toxicological Evaluation of Novel Cyclohexenone Derivative in an Animal Model through Histopathological and Biochemical Techniques. TOXICS 2021; 9:119. [PMID: 34070633 PMCID: PMC8227666 DOI: 10.3390/toxics9060119] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/13/2021] [Revised: 04/04/2021] [Accepted: 05/19/2021] [Indexed: 12/13/2022]
Abstract
Toxicity studies were conducted to provide safety data of potential drug candidates by determining lethal and toxic doses. This study was designed for pre-clinical evaluation of novel cyclohexenone derivative with respect to the acute and sub-acute toxicity along with the diabetogenic potential. Acute and sub-acute toxicity were assessed after intraperitoneal (i.p) injection of the investigational compound through selected doses for 21 days. This was followed by assessment of isolated body organs (liver, kidney, heart and pancreas) via biochemical indicators and histopathological techniques. No signs of toxicity were revealed in the study of acute toxicity. Similarly, a sub-acute toxicity study showed no significant difference in biochemical indicators on 11th and 21st days between treated and control groups. However, in blood urea nitrogen (BUN) and random blood glucose/sugar (RBS) values, significant differences were recorded. Histopathological evaluation of liver, kidney, pancreas and heart tissues revealed mild to severe changes in the form of steatosis, inflammation, fibrosis, necrosis and myofibrillary damages on 11th and 21st days of treatment. In conclusion, the median lethal dose of the tested compound was expected to be greater than 500 mg/kg. No significant change occurred in selected biomarkers, except BUN and RBS levels, but a histopathological study showed moderate toxic effect on liver, kidney, pancreas and heart tissues by the cyclohexenone derivative.
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Affiliation(s)
- Muhammad Kamil
- Department of Pharmacy, University of Peshawar, Peshawar 25120, Pakistan; (M.K.); (A.F.); (G.A.)
| | - Arifa Fatima
- Department of Pharmacy, University of Peshawar, Peshawar 25120, Pakistan; (M.K.); (A.F.); (G.A.)
| | - Sami Ullah
- Department of Pharmacy, University of Peshawar, Peshawar 25120, Pakistan; (M.K.); (A.F.); (G.A.)
| | - Gowhar Ali
- Department of Pharmacy, University of Peshawar, Peshawar 25120, Pakistan; (M.K.); (A.F.); (G.A.)
| | - Rasool Khan
- Department of Organic Chemistry, Institute of Chemical Sciences, University of Peshawar, Peshawar 25120, Pakistan;
| | - Naila Ismail
- Department of Pathology, Kabir Medical College, Gandhara University, Peshawar 25000, Pakistan;
| | - Mughal Qayum
- Department of Pharmacy, Kohat University of Science and Technology, Kohat 26000, Pakistan;
| | - Marius Irimie
- Faculty of Medicine, Transilvania University of Brasov, 500019 Brasov, Romania;
| | | | - Hanadi Talal Ahmedah
- Department of Medical Laboratory Technology, Faculty of Applied Medical Sciences, King Abdulaziz University, Rabigh 25732, Saudi Arabia
| | - Maria Elena Cocuz
- Faculty of Medicine, Transilvania University of Brasov, 500019 Brasov, Romania;
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3
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Fujioka H. Development of New Innovative Synthetic Organic Chemistry Using Lone Pairs of Oxygen Atoms. Chem Pharm Bull (Tokyo) 2020; 68:907-945. [PMID: 32999145 DOI: 10.1248/cpb.c20-00178] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Oxygen atoms have a lone pair of electrons, so they have high chelation ability, high nucleophilic ability, stabilizing ability of adjacent cations, and take a chelate or oxocarbenium ion structure with Lewis acids and metals. I took advantage of these properties to develop three new reactions, 1) asymmetric synthesis of chiral quaternary carbon centers, 2) asymmetric synthesis using acetal functions, and 3) organic chemistry using acetal-type reactive salt chemical species, and applied them to biologically active natural products synthesis. New reactions described here are all innovative and useful for natural products synthesis. In particular, the first asymmetric synthesis of fredericamycin A, and concise asymmetric synthesis of anthracycline antibiotics, scyphostatin, (+)-Sch 642305, (-)-stenine, clavolonine, (+)-rubrenolide, (+)-rubrynolide, (+)-centrolobine, and decytospolide A and B, etc., are noteworthy. Furthermore, since reactions using acetal-type reactive salt chemical species allow the coexistence of functional groups that normally cannot coexist, the reactions using reactive salts have potential to change the retrosynthesis planned based on conventional reactions.
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Affiliation(s)
- Hiromichi Fujioka
- The Institute of Scientific and Industrial Research, Osaka University
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4
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Attenuation of vincristine-induced neuropathy by synthetic cyclohexenone-functionalized derivative in mice model. Neurol Sci 2019; 40:1799-1811. [PMID: 31041611 DOI: 10.1007/s10072-019-03884-6] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/12/2019] [Accepted: 04/02/2019] [Indexed: 12/23/2022]
Abstract
Vincristine (VCR) is a well-known anticancer drug which frequently induced painful neuropathy and impairs the quality of life of patients. The present study was designed to investigate the alleviative potential of a novel cyclohexenone derivative (CHD), i.e., ethyl 6-(4-methoxyphenyl)-2-oxo-4-phenylcyclohexe-3-enecarboxylate, against VCR-induced neuropathic pain in mice model. VCR was administered intraperitoneally for 10 days in two cycles to induce neuropathic pain. Static and dynamic mechanical allodynia was evaluated using von Frey hair filaments and cotton buds, respectively. Paw thermal hyperalgesia was determined through a hot plate analgesiometer. The tail cold immersion hyperalgesia and paw cold allodynia were determined by available standard protocols. The formalin nociception was induced via subplantar injection of formalin. The antioxidant potential was evaluated via 2,2-diphenyl-1-picrylhydrazyl free radical scavenging activity. The outcome of this study revealed that CHD (30-45 mg/kg) and gabapentin (75 mg/kg) significantly enhanced the paw withdrawal threshold (PWT) and paw withdrawal latency (PWL) in static and dynamic allodynia, respectively, and increased the PWL in thermal hyperalgesia and tail withdrawal latency (TWL) as compared to the VCR-treated group. CHD significantly augmented the paw withdrawal duration (PWD) in paw cold allodynia, while the same compound only increased the paw elevation and paw licking in the delayed phase of formalin nociception. Moreover, CHD significantly inhibited the DPPH free radical scavenging action (IC50 = 56), butylated hydroxytoluene (BHT) (IC50 = 39), and ascorbic acid (IC50 = 2.93). In conclusion, CHD exhibited a profile of potential attenuative effect against the VCR-induced neuropathic pain which might be attributed to its possible antinociceptive and antioxidant effect.
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Study on the structure, vibrational analysis and molecular docking of fluorophenyl derivatives using FT-IR and density functional theory computations. J Mol Struct 2018. [DOI: 10.1016/j.molstruc.2018.03.070] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
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El Assal M, Peixoto PA, Coffinier R, Garnier T, Deffieux D, Miqueu K, Sotiropoulos JM, Pouységu L, Quideau S. Synthesis of Scyphostatin Analogues through Hypervalent Iodine-Mediated Phenol Dearomatization. J Org Chem 2017; 82:11816-11828. [DOI: 10.1021/acs.joc.7b02366] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Mourad El Assal
- Univ. Bordeaux, ISM (CNRS−UMR
5255), 351 cours de la
Libération, 33405 Talence Cedex, France
| | - Philippe A. Peixoto
- Univ. Bordeaux, ISM (CNRS−UMR
5255), 351 cours de la
Libération, 33405 Talence Cedex, France
| | - Romain Coffinier
- Univ. Bordeaux, ISM (CNRS−UMR
5255), 351 cours de la
Libération, 33405 Talence Cedex, France
| | - Tony Garnier
- Univ. Bordeaux, ISM (CNRS−UMR
5255), 351 cours de la
Libération, 33405 Talence Cedex, France
| | - Denis Deffieux
- Univ. Bordeaux, ISM (CNRS−UMR
5255), 351 cours de la
Libération, 33405 Talence Cedex, France
| | - Karinne Miqueu
- CNRS/UNIV PAU & PAYS ADOUR, Institut des Sciences Analytiques et de Physico-Chimie pour l’Environnement et les Matériaux (IPREM, UMR 5254), Hélioparc, 2 avenue du Président Angot, 64053 Pau Cedex 09, France
| | - Jean-Marc Sotiropoulos
- CNRS/UNIV PAU & PAYS ADOUR, Institut des Sciences Analytiques et de Physico-Chimie pour l’Environnement et les Matériaux (IPREM, UMR 5254), Hélioparc, 2 avenue du Président Angot, 64053 Pau Cedex 09, France
| | - Laurent Pouységu
- Univ. Bordeaux, ISM (CNRS−UMR
5255), 351 cours de la
Libération, 33405 Talence Cedex, France
| | - Stéphane Quideau
- Univ. Bordeaux, ISM (CNRS−UMR
5255), 351 cours de la
Libération, 33405 Talence Cedex, France
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7
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Das S, Goswami RK. Total synthesis of marine natural products separacenes A and B. Org Biomol Chem 2017; 15:4842-4850. [DOI: 10.1039/c7ob00345e] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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8
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Sheena Mary Y, Yohannan Panicker C, Sapnakumari M, Narayana B, Sarojini BK, Al-Saadi AA, Van Alsenoy C, War JA. Molecular structure, FT-IR, vibrational assignments, HOMO-LUMO, MEP, NBO analysis and molecular docking study of ethyl-6-(4-chlorophenyl)-4-(4-fluorophenyl)-2-oxocyclohex-3-ene-1-carboxylate. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2015; 138:73-84. [PMID: 25463053 DOI: 10.1016/j.saa.2014.11.012] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/12/2014] [Revised: 10/26/2014] [Accepted: 11/05/2014] [Indexed: 06/04/2023]
Abstract
The optimized molecular structure, vibrational frequencies, corresponding vibrational assignments of ethyl-6-(4-chlorophenyl)-4-(4-fluoro-phenyl)-2-oxocyclohex-3-ene-1-carboxylate have been investigated experimentally and theoretically using Gaussian09 software. The title compound was optimized using the HF and DFT levels of theory. The geometrical parameters are in agreement with the XRD data. The stability of the molecule has been analyzed by NBO analysis. The HOMO and LUMO analysis is used to determine the charge transfer within the molecule. Molecular electrostatic potential was performed by the DFT method. As can be seen from the MEP map of the title compound, regions having the negative potential are over the electro negative atoms, the region having the positive potential are over the phenyl rings and the remaining species are surrounded by zero potential. First hyperpolarizability is calculated in order to find its role in non linear optics. The title compound binds at the active sites of both CypD and β-secretase and the molecular docking results draw the conclusion that the compound might exhibit β-secretase inhibitory activity which could be utilized for development of new anti-alzheimeric drugs with mild CypD inhibitory activity.
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Affiliation(s)
- Y Sheena Mary
- Department of Physics, Fatima Mata National College, Kollam, Kerala, India
| | - C Yohannan Panicker
- Department of Physics, TKM College of Arts and Science, Kollam, Kerala, India.
| | - M Sapnakumari
- Department of Studies in Chemistry, Mangalore University, Mangalagangotri, Karanataka, India
| | - B Narayana
- Department of Studies in Chemistry, Mangalore University, Mangalagangotri, Karanataka, India
| | - B K Sarojini
- Industrial Chemistry-Division, Department of Studies in Chemistry, Mangalore University, Mangalagangotri, Karanataka, India
| | - Abdulaziz A Al-Saadi
- Department of Chemistry, King Fahd University of Petroleum and Minerals, Dhahran 31261, Saudi Arabia
| | | | - Javeed Ahmad War
- Department of Chemistry, Dr. H.S. Gour Central University, Sagar, M.P., India
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One-pot diastreoselective synthesis of highly functionalized cyclohexenones: 2-oxo-N,4,6-triarylcyclohex-3-enecarboxamides. Mol Divers 2014; 18:821-8. [PMID: 25096399 DOI: 10.1007/s11030-014-9541-7] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/27/2014] [Accepted: 07/13/2014] [Indexed: 10/25/2022]
Abstract
A series of 2-oxo-N,4,6-triarylcyclohex-3-enecarboxamides were synthesized by condensing acetophenone and aromatic aldehydes with acetoacetanilide in ethanol in the presence of 2-hydroxyethylammonium acetate (2-HEAA) as a basic ionic liquid at ambient conditions. This process is simple, efficient and environmentally benign and proceeds in high yield, short reaction times and there is no need for column chromatography purification.
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10
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Schmidt Y, Lehr K, Colas L, Breit B. Assignment of Relative Configuration of Desoxypropionates by1H NMR Spectroscopy: Method Development, Proof of Principle by Asymmetric Total Synthesis of Xylarinic Acid A and Applications. Chemistry 2012; 18:7071-81. [DOI: 10.1002/chem.201103988] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/12/2011] [Indexed: 11/12/2022]
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11
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Xu S, Lee CT, Rao H, Negishi EI. Highly(≥98%) Stereo- and Regioselective Trisubstituted Alkene Synthesis of Wide Applicability via 1-Halo-1-alkyne Hydroboration-Tandem Negishi-Suzuki Coupling or Organoborate Migratory Insertion Protocol. Adv Synth Catal 2011; 353:2981-2987. [PMID: 24072993 DOI: 10.1002/adsc.201100420] [Citation(s) in RCA: 54] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Abstract
(Z)-1-Halo-1-alkenylboranes (7), preparable in 82-90% yields as ≥98% isomerically pure compounds via hydroboration of 1-halo-1-alkynes, have been converted to a wide range of trisubstituted alkenes via three different routes in the tail-to-head (T-to-H) direction, i.e., (i) Palladium-catalyzed Negishi-Suzuki tandem alkenylation, (ii) treatment of 7 with organolithium or Grignard reagents to generate α-bromo-1-alkenylboronate complexes (10) that can undergo migratory insertion of a carbon group (R2) to form (E)-alkenylboranes (11) with inversion of alkene configuration (≥98% inversion), followed by fluoride-promoted Suzuki alkenylation, and (iii) Negishi coupling to generate (Z)-alkenylboranes (8) in ≥98% retention of configuration, followed by treatment with organolithium or Grignard reagents to produce trisubstituted alkenes with reversed stereo configurations. The synthetic utility of the present methodology has been demonstrated in the highly selective synthesis of side chain (4) of scyphostatin in 28% yield over nine steps in the longest linear sequence from allyl alcohol. Thus, this new tandem protocol has been emerged as the most widely applicable and highly selective route to trisubstituted alkenes including those that are otherwise difficult to prepare.
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Affiliation(s)
- Shiqing Xu
- Herbert C. Brown Laboratories of Chemistry, Purdue University, 560 Oval Dr., West Lafayette, IN 47907-2084, USA, ;
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12
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13
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Wang G, Yin N, Negishi EI. Highly stereoselective total synthesis of fully hydroxy-protected mycolactones A and B and their stereoisomerization upon deprotection. Chemistry 2011; 17:4118-30. [PMID: 21412860 DOI: 10.1002/chem.201002627] [Citation(s) in RCA: 43] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/12/2010] [Revised: 12/15/2010] [Indexed: 11/11/2022]
Abstract
Unprecedentedly efficient and highly (≥98 %) stereoselective syntheses of mycolactones A and B side chains relied heavily on Pd-catalyzed alkenylation (Negishi version) and were completed in 11 longest linear steps from ethyl (S)-3-hydroxybutyrate in 12% and 11% overall yield, respectively, roughly corresponding to an average of 82% yield per step. The synthesis of mycolactone core was realized by using Pd-catalyzed alkenyl-allyl coupling and an epoxide-opening reaction with a trialkylalkenylaluminate as key steps. Fully hydroxy-protected mycolactones A and B of ≥98% isomeric purity were synthesized successfully for the first time. However, unexpected 4:3-5:4 inseparable mixtures of mycolactones A and B were obtained upon deprotection.
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Affiliation(s)
- Guangwei Wang
- Herbert C. Brown Laboratories of Chemistry, Purdue University, 560 Oval Drive, West Lafayette, IN 47907-2084, USA
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14
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Negishi EI, Wang G, Rao H, Xu Z. Alkyne elementometalation-Pd-catalyzed cross-coupling. Toward synthesis of all conceivable types of acyclic alkenes in high yields, efficiently, selectively, economically, and safely: "green" way. J Org Chem 2010; 75:3151-82. [PMID: 20465291 PMCID: PMC2933819 DOI: 10.1021/jo1003218] [Citation(s) in RCA: 118] [Impact Index Per Article: 8.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Palladium-catalyzed cross-coupling reactions, especially those involving Zn, Al, Zr (Negishi coupling), and B (Suzuki coupling), collectively have brought about "revolutionary" changes in organic synthesis. Thus, two regio- and stereodefined carbon groups generated as R(1)M (M = Zn, Al, B, Cu, Zr, etc.) and R(2)X (X = I, Br, OTs, etc.) may now be cross-coupled to give R(1)-R(2) with essentially full retention of all structural features. For alkene syntheses, alkyne elementometalation reactions including hydrometalation (B, Al, Zr, etc.), carbometalation (Cu, Al-Zr, etc.), and haloboration (BX(3) where X is Cl, Br, and I) have proven to be critically important. Some representative examples of highly efficient and selective (>or=98%) syntheses of di-, tri-, and oligoenes containing regio- and stereodefined di- and trisubstituted alkenes of all conceivable types will be discussed with emphasis on those of natural products. Some interesting but undesirable cases involving loss of the initial structural identities of the alkenyl groups are attributable to the formation of allylpalladium species, which must be either tamed or avoided. Some such examples involving the synthesis of 1,3-, 1,4-, and 1,5-dienes will also be discussed.
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Affiliation(s)
- Ei-Ichi Negishi
- Herbert C. Brown Laboratories of Chemistry, Purdue University, 560 Oval Drive, West Lafayette, Indiana 47907-2084, USA.
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16
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Schmidt Y, Breit B. Direct Assignment of the Relative Configuration in 1,3,n-Methyl-Branched Carbon Chains by 1H NMR Spectroscopy. Org Lett 2010; 12:2218-21. [DOI: 10.1021/ol1005399] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Yvonne Schmidt
- Institut für Organische Chemie und Biochemie, Freiburg Institute for Advanced Studies (FRIAS), Albert-Ludwigs-Universität Freiburg, Alberstrasse 21, 79104 Freiburg, Germany
| | - Bernhard Breit
- Institut für Organische Chemie und Biochemie, Freiburg Institute for Advanced Studies (FRIAS), Albert-Ludwigs-Universität Freiburg, Alberstrasse 21, 79104 Freiburg, Germany
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Fun HK, Hemamalini M, Samshuddin S, Narayana B, Yathirajan HS. Methyl 4,6-bis-(4-fluoro-phen-yl)-2-oxo-cyclo-hex-3-ene-1-carboxyl-ate. Acta Crystallogr Sect E Struct Rep Online 2010; 66:o864-o865. [PMID: 21580687 PMCID: PMC2983895 DOI: 10.1107/s1600536810009414] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/08/2010] [Accepted: 03/12/2010] [Indexed: 05/30/2023]
Abstract
The 3-cyclo-hexene units adopt envelope conformations in each of the two independent mol-ecules that comprise the asymmetric unit of the title compound, C(20)H(16)F(2)O(3). The dihedral angles between the two fluoro-phenyl rings are 79.7 (2) and 73.7 (2)° in the two mol-ecules. In one of the mol-ecules, two C-H groups of the cyclo-hexene ring are disordered over two sets of sites in a 0.818 (13):0.182 (13) ratio, the major and minor components corresponding to the two enanti-omeric forms of the mol-ecule. Weak inter-molecular C-H⋯O inter-actions help to stabilize the crystal structure.
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Affiliation(s)
- Hoong-Kun Fun
- X-ray Crystallography Unit, School of Physics, Universiti Sains Malaysia, 11800 USM, Penang, Malaysia
| | - Madhukar Hemamalini
- X-ray Crystallography Unit, School of Physics, Universiti Sains Malaysia, 11800 USM, Penang, Malaysia
| | - S. Samshuddin
- Department of Studies in Chemistry, Mangalore University, Mangalagangotri 574 199, India
| | - B. Narayana
- Department of Studies in Chemistry, Mangalore University, Mangalagangotri 574 199, India
| | - H. S. Yathirajan
- Department of Studies in Chemistry, University of Mysore, Manasagangotri, Mysore 570 006, India
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Pitsinos E, Athinaios N, Xu Z, Wang G, Negishi EI. Total synthesis of (+)-scyphostatin featuring an enantioselective and highly efficient route to the side-chain via Zr-catalyzed asymmetric carboalumination of alkenes (ZACA). Chem Commun (Camb) 2010; 46:2200-2. [PMID: 20234905 DOI: 10.1039/b920261g] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
(+)-Scyphostatin (1) was synthesized via (i) construction of a side-chain 3b of > or = 98% purity in 19% yield in eleven steps featuring ZACA reaction, Negishi coupling, and HWE olefination, (ii) an asymmetric synthesis of a fully protected core 4 from 10a, and (iii) a three-step assembly of 1 in 42% yield.
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Affiliation(s)
- Emmanuel Pitsinos
- Laboratory of Natural Products Synthesis & Bioorganic Chemistry, Institute of Physical Chemistry, NCSR DEMOKRITOS, P.O. Box 60228, GR 153 10, Aghia Paraskevi, Greece.
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Fleury E, Lannou MI, Bistri O, Sautel F, Massiot G, Pancrazi A, Ardisson J. Advances in the Universal NMR Database: Toward the Determination of the Relative Configurations of Large Polypropionates. European J Org Chem 2009. [DOI: 10.1002/ejoc.200900616] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
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20
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Ashalatha BV, Narayana B, Vijaya Raj KK. Synthesis and Characterization of Some Novel 3-Bromo-2-acetylthiophene Chalcones and Biological Evaluation of Their Ethyl-4-(3-bromothien-2-yl)-2-oxo-6-(aryl)cyclohex-3-ene-1-carboxylate Derivatives. PHOSPHORUS SULFUR 2009. [DOI: 10.1080/10426500802414189] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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Wang G, Huang Z, Negishi EI. Highly stereoselective and efficient synthesis of ω-heterofunctional di- and trienoic esters for Horner–Wadsworth–Emmons reaction via alkyne hydrozirconation and Pd-catalyzed alkenylation. Tetrahedron Lett 2009. [DOI: 10.1016/j.tetlet.2009.02.023] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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22
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Li H, Mayekar AN, Narayana B, Yathirajan HS, Harrison WTA. Ethyl 6-(6-meth-oxy-2-naphth-yl)-2-oxo-4-(2-thien-yl)cyclo-hex-3-ene-1-carboxyl-ate. Acta Crystallogr Sect E Struct Rep Online 2009; 65:o1533. [PMID: 21582822 PMCID: PMC2969391 DOI: 10.1107/s1600536809021308] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/28/2009] [Accepted: 06/04/2009] [Indexed: 11/10/2022]
Abstract
The title compound, C(24)H(22)O(4)S, was prepared by reaction between (2E)-3-(6-meth-oxy-2-naphth-yl)-1-(2-thien-yl)prop-2-en-1-one and ethyl acetoacetate. In the crystal, the cyclo-hexenone ring shows a distorted half-chair conformation. The length of the double bond in the cyclohexenone ring [1.343 (4) Å] is normal.
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23
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Fujioka H, Kita Y. Stereocontrol between Remote Atom Centers Using Chiral Acetals and its Application to Asymmetric Syntheses of Natural Products. J SYN ORG CHEM JPN 2009. [DOI: 10.5059/yukigoseikyokaishi.67.606] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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24
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Negishi EI, Huang Z, Wang G, Mohan S, Wang C, Hattori H. Recent advances in efficient and selective synthesis of di-, tri-, and tetrasubstituted alkenes via Pd-catalyzed alkenylation-carbonyl olefination synergy. Acc Chem Res 2008; 41:1474-85. [PMID: 18783256 DOI: 10.1021/ar800038e] [Citation(s) in RCA: 372] [Impact Index Per Article: 23.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Although generally considered competitive, the alkenylation and carbonyl olefination routes to alkenes are also complementary. In this Account, we focus on these approaches for the synthesis of regio- and stereodefined di- and trisubstituted alkenes and a few examples of tetrasubstituted alkenes. We also discuss the subset of regio- and stereodefined dienes and oligoenes that are conjugated. Pd-catalyzed cross-coupling using alkenyl metals containing Zn, Al, Zr, and B (Negishi coupling and Suzuki coupling) or alkenyl halides and related alkenyl electrophiles provides a method of alkenylation with the widest applicability and predictability, with high stereo- and regioselectivity. The requisite alkenyl metals or alkenyl electrophiles are most commonly prepared through highly selective alkyne addition reactions including (i) conventional polar additions, (ii) hydrometalation, (iii) carbometalation, (iv) halometalation, and (v) other heteroatom-metal additions. Although much more limited in applicability, the Heck alkenylation offers an operationally simpler, viable alternative when it is highly selective and satisfactory. A wide variety of carbonyl olefination reactions, especially the Wittig olefination and its modifications represented by the E-selective HWE olefination and the Z-selective Still-Gennari olefination, collectively offer the major alternative to the Pd-catalyzed alkenylation. However, the carbonyl olefination method fundamentally suffers from more limited stereochemical options and generally lower stereoselectivity levels than the Pd-catalyzed alkenylation. In a number of cases, however, very high (>98%) stereoselectivity levels have been attained in the syntheses of both E and Z isomers. The complementarity of the alkenylation and carbonyl olefination routes provide synthetic chemists with valuable options. While the alkenylation involves formation of a C-C single bond to a CC bond, the carbonyl olefination converts a CO bond to a CC bond. When a precursor to the desired alkene is readily available as an aldehyde, the carbonyl olefination is generally the more convenient of the two. This is a particularly important factor in many cases where the desired alkene contains an allylic asymmetric carbon center, since alpha-chiral aldehydes can be prepared by a variety of known asymmetric methods and readily converted to allylically chiral alkenes via carbonyl olefination. On the other hand, a homoallylically carbon-branched asymmetric center can be readily installed by either Pd-catalyzed isoalkyl-alkenyl coupling or Zr-catalyzed asymmetric carboalumination (ZACA reaction) of 1,4-dienes. In short, it takes all kinds to make alkenes, just as it takes all kinds to make the world.
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Affiliation(s)
- Ei-ichi Negishi
- H. C. Brown Laboratories of Chemistry, Purdue University, 560 Oval Drive, West Lafayette, Indiana 47907-2084
| | - Zhihong Huang
- H. C. Brown Laboratories of Chemistry, Purdue University, 560 Oval Drive, West Lafayette, Indiana 47907-2084
| | - Guangwei Wang
- H. C. Brown Laboratories of Chemistry, Purdue University, 560 Oval Drive, West Lafayette, Indiana 47907-2084
| | - Swathi Mohan
- H. C. Brown Laboratories of Chemistry, Purdue University, 560 Oval Drive, West Lafayette, Indiana 47907-2084
| | - Chao Wang
- H. C. Brown Laboratories of Chemistry, Purdue University, 560 Oval Drive, West Lafayette, Indiana 47907-2084
| | - Hatsuhiko Hattori
- H. C. Brown Laboratories of Chemistry, Purdue University, 560 Oval Drive, West Lafayette, Indiana 47907-2084
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25
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Wang G, Huang Z, Negishi EI. Efficient and selective syntheses of (all-E)- and (6E,10Z)-2'-O-methylmyxalamides D via Pd-catalyzed alkenylation--carbonyl olefination synergy. Org Lett 2008; 10:3223-6. [PMID: 18593171 DOI: 10.1021/ol801115s] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Highly efficient and selective syntheses of both (all- E) and (6 E,10 Z)-isomers of 2'- O-methylmyxalamide D ( 2 and 3), in which the crucial conjugated pentaene moieties were assembled in > or =98% stereoselectivity through the use of two Pd-catalyzed alkenylation reactions, the Horner-Wadsworth-Emmons (HWE) olefination, and either the Corey-Schlessinger-Mills modified (CSM-modified) Peterson olefination for 2 or the Still-Gennari olefination for 3, are reported. Either 2 or 3 was prepared in 16% yield in seven steps from propargyl alcohol.
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Affiliation(s)
- Guangwei Wang
- Herbert C. Brown Laboratories of Chemistry, Purdue University, 560 Oval Drive, West Lafayette, Indiana 47907-2084, USA
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26
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Fujioka H, Sawama Y, Kotoku N, Ohnaka T, Okitsu T, Murata N, Kubo O, Li R, Kita Y. Concise Asymmetric Total Synthesis of Scyphostatin, a Potent Inhibitor of Neutral Sphingomyelinase. Chemistry 2007; 13:10225-38. [PMID: 17907134 DOI: 10.1002/chem.200700871] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
The concise asymmetric total synthesis of scyphostatin has been achieved by condensation of the optically active cyclohexane unit, prepared from the commercially available 1,4-cyclohexadiene by our own method, and the side chain, prepared by the method developed by Hoye and Tennakoon (T. R. Hoye, M. A. Tennakoon, Org. Lett. 2000, 2, 1481-1483). The modification of the epoxy cyclohexenone unit was achieved in a late stage of the total synthesis, and deprotection of the primary alcohol was conducted in the final step. During the synthesis several key reactions were attained: 1) intramolecular bromoetherification of the cyclohexadiene acetal; 2) stereoselective introduction of the tertiary alcohol, 3) deprotection of the acetal function to the aldehyde by combination with silyl triflate/2,4,6-collidine and the one-pot synthesis of the disilyl aldehyde compounds, with different types of silyl groups, from the dihydroxy acetal compounds; and 4) facile deprotection of the 2,4-dimethoxyphenylmethyl ((2,4)DMPM) protecting group of the primary alcohol.
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Affiliation(s)
- Hiromichi Fujioka
- Graduate School of Pharmaceutical Sciences, Osaka University, Suita, Osaka, 565-0871, Japan.
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27
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Bifulco G, Dambruoso P, Gomez-Paloma L, Riccio R. Determination of relative configuration in organic compounds by NMR spectroscopy and computational methods. Chem Rev 2007; 107:3744-79. [PMID: 17649982 DOI: 10.1021/cr030733c] [Citation(s) in RCA: 452] [Impact Index Per Article: 26.6] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Affiliation(s)
- Giuseppe Bifulco
- Dipartimento di Scienze Farmaceutiche, University of Salerno, Via Ponte Don Melillo, 84084 Fisciano, Salerno, Italy.
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Negishi EI. Transition Metal-Catalyzed Organometallic Reactions that Have Revolutionized Organic Synthesis. BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN 2007. [DOI: 10.1246/bcsj.80.233] [Citation(s) in RCA: 220] [Impact Index Per Article: 12.9] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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29
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Katoh T, Watanabe K, Oguchi T, Takizawa T, Furuuchi M, Abe H. Synthesis of Scyphostatin Analogs Possessing Various Saturated Fatty Acid Side-Chains. HETEROCYCLES 2007. [DOI: 10.3987/com-07-s(u)52] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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30
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Wascholowski V, Giannis A, Pitsinos EN. Influence of the Scyphostatin Side Chain on the Mode of Inhibition of Neutral Sphingomyelinase. ChemMedChem 2006; 1:718-21. [PMID: 16902925 DOI: 10.1002/cmdc.200600099] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Veit Wascholowski
- Institut für Organische Chemie, Universität Leipzig, Johannisallee 29, 04103 Leipzig, Germany
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31
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Enantiocontrolled synthesis of the epoxycyclohexenone moieties of scyphostatin, a potent and specific inhibitor of neutral sphingomyelinase. Tetrahedron 2006. [DOI: 10.1016/j.tet.2005.10.082] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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32
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Marco-Contelles J, Molina MT, Anjum S. Naturally occurring cyclohexane epoxides: sources, biological activities, and synthesis. Chem Rev 2005; 104:2857-99. [PMID: 15186183 DOI: 10.1021/cr980013j] [Citation(s) in RCA: 205] [Impact Index Per Article: 10.8] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- José Marco-Contelles
- Laboratorio de Radicales Libres (IQOG, CSIC), C/Juan de la Cierva, 3, 28006-Madrid, Spain
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33
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Claus RA, Wüstholz A, Müller S, Bockmeyer CL, Riedel NH, Kinscherf R, Deigner HP. Synthesis and Antiapoptotic Activity of a Novel Analogue of the Neutral Sphingomyelinase Inhibitor Scyphostatin. Chembiochem 2005; 6:726-37. [PMID: 15751001 DOI: 10.1002/cbic.200400228] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
The enantioselective synthesis of an analogue of scyphostatin, a potent inhibitor of the neutral sphingomyelinase, is described. The synthesis starts with cyclohexanone and a protected D-serine derivative. The key step is an asymmetric hydroxylation to access a hydroxycyclohexanone, which is transformed into a substituted hydroxycyclohexenone. This is converted into the scyphostatin analogue 14, a chemically and metabolically stabilised compound lacking the epoxy function of the natural congener and carrying a palmitic acid group instead of the native trienoyl residue. An evaluation of the biological activity of 14 revealed neutral sphingomyelinase inhibition in several in vivo test systems (monocytes, macrophages, hepatocytes) monitoring antiapoptotic effects and the inversion of phorbolester-induced translocation of green fluorescent protein labelled kinase (protein kinase C-alpha).
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Affiliation(s)
- Ralf A Claus
- Department for Anaesthesiology and Intensive Care Therapy, Division for Experimental Anaesthesiology, Friedrich-Schiller-University Jena, Research Centre Lobeda, Erlanger Allee 101, 07747 Jena, Germany
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34
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Takagi R, Tojo K, Iwata M, Ohkata K. Synthesis of a 4,5-epoxy-2-cyclohexen-1-one derivative via epoxide ring opening, 1,3-carbonyl transposition and epoxide ring regeneration: a synthetic study on a scyphostatin analogue. Org Biomol Chem 2005; 3:2031-6. [PMID: 15889188 DOI: 10.1039/b504039f] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A 6-alkyl-4,5-epoxy-6-hydroxy-2-cyclohexen-1-one derivative, a model compound for the hydrophilic moiety of scyphostatin, was stereoselectively synthesized from the Diels-Alder adduct. The key steps were the reductive cleavage of the 4,5-epoxide ring of the epoxidated adduct, the 1,3-carbonyl transposition of the 3-carbonyl group to the C1 position by a Wharton reaction and stereoselective bromination to provide a trans bromohydrin derivative, a precursor to the desired compound. Desilylation of the bromohydrin derivative with TBAF directly gave the target compound.
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Affiliation(s)
- Ryukichi Takagi
- Department of Chemistry, Graduate School of Science, Hiroshima University, 1-3-1 Kagamiyama, Higashi-Hiroshima, 739-8526, Japan
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35
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Inoue M, Yokota W, Murugesh MG, Izuhara T, Katoh T. Total Synthesis of (+)-Scyphostatin, a Potent and Specific Inhibitor of Neutral Sphingomyelinase. Angew Chem Int Ed Engl 2004. [DOI: 10.1002/ange.200454192] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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36
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Inoue M, Yokota W, Murugesh MG, Izuhara T, Katoh T. Total Synthesis of (+)-Scyphostatin, a Potent and Specific Inhibitor of Neutral Sphingomyelinase. Angew Chem Int Ed Engl 2004; 43:4207-9. [PMID: 15307088 DOI: 10.1002/anie.200454192] [Citation(s) in RCA: 51] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Munenori Inoue
- Sagami Chemical Research Center, 2743-1 Hayakawa, Ayase, Kanagawa 252-1193, Japan
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37
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The preparation of simplified scyphostatin analogues using a tethered aminohydroxylation (TA) strategy. Tetrahedron Lett 2004. [DOI: 10.1016/j.tetlet.2004.07.012] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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38
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Negishi EI, Tan Z, Liang B, Novak T. An efficient and general route to reduced polypropionates via Zr-catalyzed asymmetric CC bond formation. Proc Natl Acad Sci U S A 2004; 101:5782-7. [PMID: 15073327 PMCID: PMC395985 DOI: 10.1073/pnas.0307514101] [Citation(s) in RCA: 93] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
An efficient and general method for the synthesis of reduced polypropionates has been developed through the application of asymmetric carboalumination of alkenes catalyzed by dichlorobis(1-neomenthylindenyl)zirconium [(NMI)(2)ZrCl(2)]. In this investigation, attention has been focused on those reduced polypropionates that are alpha-monoheterofunctional and either omega-ethyl or omega-n-propyl. The reaction of 3-buten-1-ol with triethylaluminum (Et(3)Al) or tripropylaluminum ((n)Pr(3)Al) in the presence of (NMI)(2)ZrCl(2) and isobutylaluminoxane gave, after protonolysis, (R)-3-methyl-1-pentanol as well as (R)- and (S)-3-methyl-1-hexanols in 88-92% yield in 90-92% enantiomeric excess in one step. These 3-monomethyl-1-alkanols were then converted to two stereoisomers each of 2,4-dimethyl-1-hexanols and 2,4-dimethyl-1-heptanols via methylalumination catalyzed by (NMI)(2)ZrCl(2) and methylaluminoxane followed by oxidation with O(2). The four-step (or three-isolation-step) protocol provided syn-2,4-dimethyl-1-alkanols of >/=98% stereoisomeric purity in approximately 50% overall yields, whereas (2S,4R)-2,4-dimethyl-1-hexanol of comparable purity was obtained in 40% overall yield. Commercial availability of (S)-2-methyl-1-butanol as a relatively inexpensive material suggested its use in the synthesis of (2S,4S)- and (2R,4S)-2,4-dimethyl-1-hexanols via a three-step protocol consisting of (i) iodination, (ii) zincation followed by Pd-catalyzed vinylation, and (iii) Zr-catalyzed methylalumination followed by oxidation with O(2). This three-step protocol is iterative and applicable to the synthesis of reduced polypropionates containing three or more branching methyl groups, rendering this method for the synthesis of reduced polypropionates generally applicable. Its synthetic utility has been demonstrated by preparing the side chain of zaragozic acid A and the C11-C20 fragment of antibiotics TMC-151 A-F.
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Affiliation(s)
- Ei-Ichi Negishi
- H. C. Brown Laboratories of Chemistry, Purdue University, 560 Oval Drive, West Lafayette, IN 47907-2084, USA.
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39
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40
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Mas G, González L, Vilarrasa J. Synthetic routes to the stereoisomers of 2,4-dimethylpentane-1,5-diol derivatives. Tetrahedron Lett 2003. [DOI: 10.1016/j.tetlet.2003.09.199] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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41
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Eipert M, Maichle-Mössmer C, Maier ME. Use of epoxidation and epoxide opening reactions for the synthesis of highly functionalized 1-oxaspiro[4.5]decan-2-ones and related compounds. Tetrahedron 2003. [DOI: 10.1016/j.tet.2003.08.010] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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42
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Murray LM, O'Brien P, Taylor RJK. Stereoselective reactions of a (-)-quinic acid-derived enone: application to the synthesis of the core of scyphostatin. Org Lett 2003; 5:1943-6. [PMID: 12762692 DOI: 10.1021/ol034521d] [Citation(s) in RCA: 41] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
[reaction: see text] A (-)-quinic acid-derived enone, with the trans-1,2-diol protected as a 2,3-dimethoxybutanediyldioxy ketal, provides an excellent template for further highly stereoselective elaboration as exemplified by its conversion into the core of scyphostatin, a potent inhibitor of neutral sphingomyelinase.
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Affiliation(s)
- Lynne M Murray
- Department of Chemistry, University of York, Heslington, York YO10 5DD, UK
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43
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Izuhara T, Katoh T. Studies toward the total synthesis of scyphostatin: first entry to the highly functionalized cyclohexenone segment. Org Lett 2001; 3:1653-6. [PMID: 11405678 DOI: 10.1021/ol015873s] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The cyclohexenone segment 2 of scyphostatin (1), a potent inhibitor of neutral sphingomyelinase, was synthesized in an enantioselective manner starting from the bromo ether 5 and D-serinal derivative 3. The synthetic method features a coupling reaction of 5 with 3 to construct the asymmetric quaternary carbon center and a stereospecific epoxide ring formation as the key steps.
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Affiliation(s)
- T Izuhara
- Sagami Chemical Research Center, Nishi-Ohnuma, Sagamihara, Kanagawa 229-0012, Japan
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44
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Tsunashima K, Ide M, Kadoi H, Hirayama A, Nakata M. Synthesis of the C15–C27 portion of venturicidins: a formal total synthesis of venturicidin X. Tetrahedron Lett 2001. [DOI: 10.1016/s0040-4039(01)00518-4] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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45
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Izuhara T, Katoh T. Enantiocontrolled synthesis of (4S,5S,6S)-6-benzyl-4,5-epoxy-6-hydroxy-2-cyclohexen-1-one, a model compound for the epoxycyclohexenone moiety of scyphostatin. Tetrahedron Lett 2000. [DOI: 10.1016/s0040-4039(00)01312-5] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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46
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