1
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Zheng J, Peters BBC, Jiang W, Suàrez LA, Ahlquist MSG, Singh T, Andersson PG. The Effect of Conformational Freedom vs Restriction on the Rate in Asymmetric Hydrogenation: Iridium-Catalyzed Regio- and Enantioselective Monohydrogenation of Dienones. Chemistry 2023:e202303406. [PMID: 38109038 DOI: 10.1002/chem.202303406] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/16/2023] [Revised: 12/14/2023] [Accepted: 12/18/2023] [Indexed: 12/19/2023]
Abstract
Transition metal-catalyzed asymmetric hydrogenation constitutes an efficient strategy for the preparation of chiral molecules. When dienes are subjected to hydrogenation, control over regioselectivity still presents a large challenge and the fully saturated alkane is often yielded. A few successful monohydrogenations of dienes have been reported, but hitherto these are only efficient for dienes comprised of two distinctly different olefins. Herein, the reactivity of a conjugated carbonyl compound as a function of their conformational freedom is studied, based on a combined experimental and theoretical approach. It was found that alkenes in the (s)-cis conformation experience a large rate acceleration while (s)-trans restrained alkenes undergo hydrogenation slowly. Ultimately, this reactivity aspect was exploited in a novel method for the monohydrogenation of dienes based on conformational restriction ((s)-cis vs (s)-trans). This mode of discrimination conceptually differs from existing monohydrogenations and dienones constructed of two olefins similar in nature could efficiently be hydrogenated to the chiral alkene (up to 99 % ee). The extent of regioselection is even powerful enough to overcome the conventional reactivity order of substituted olefins (di>tri>tetra). This high yielding and atom-economical protocol provides an interesting opportunity to instal a stereogenic center on a carbocycle, while leaving a synthetically useful alkene untouched.
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Affiliation(s)
- Jia Zheng
- Department of Organic Chemistry, Stockholm University, 10691, Stockholm, Sweden
| | - Bram B C Peters
- Department of Organic Chemistry, Stockholm University, 10691, Stockholm, Sweden
| | - Wei Jiang
- Department of Organic Chemistry, Stockholm University, 10691, Stockholm, Sweden
| | - Lluís Artús Suàrez
- School of Biotechnology, KTH Royal Institute of Technology, 10691, Stockholm, Sweden
| | - Mårten S G Ahlquist
- School of Biotechnology, KTH Royal Institute of Technology, 10691, Stockholm, Sweden
| | - Thishana Singh
- School of Chemistry and Physics, University of Kwazulu-Natal, Private Bag X54001, 4000, Durban, South Africa
| | - Pher G Andersson
- Department of Organic Chemistry, Stockholm University, 10691, Stockholm, Sweden
- School of Chemistry and Physics, University of Kwazulu-Natal, Private Bag X54001, 4000, Durban, South Africa
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2
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Moser D, Schmidt TA, Sparr C. Diastereodivergent Catalysis. JACS AU 2023; 3:2612-2630. [PMID: 37885579 PMCID: PMC10598570 DOI: 10.1021/jacsau.3c00216] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 05/02/2023] [Revised: 09/01/2023] [Accepted: 09/06/2023] [Indexed: 10/28/2023]
Abstract
Alongside enantioselective catalysis, synthetic chemists are often confronted by the challenge of achieving catalyst control over the relative configuration to stereodivergently access desired diastereomers. Typically, these approaches iteratively or simultaneously control multiple stereogenic units for which dual catalytic methods comprising sequential, relay, and synergistic catalysis emerged as particularly efficient strategies. In this Perspective, the benefits and challenges of catalyst-controlled diastereodivergence in the construction of carbon stereocenters are discussed on the basis of illustrative examples. The concepts are then transferred to diastereodivergent catalysis for atropisomeric systems with twofold and higher-order stereogenicity as well as diastereodivergent catalyst control over E- and Z-configured alkenes.
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Affiliation(s)
| | | | - Christof Sparr
- Department of Chemistry, University
of Basel, St. Johanns-Ring 19, 4056 Basel, Switzerland
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3
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Kundu S, Sarkar D. Synthetic Attempts Towards α‐Tocopherol – An Overview. J Heterocycl Chem 2022. [DOI: 10.1002/jhet.4565] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Subhradip Kundu
- Organic Synthesis and Molecular Engineering Lab, Department of Chemistry National Institute of Technology Rourkela Odisha India
| | - Debayan Sarkar
- Organic Synthesis and Molecular Engineering Lab, Department of Chemistry National Institute of Technology Rourkela Odisha India
- Department of Chemistry Indian Institute of Technology Indore Madhya Pradesh India
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4
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Peters BBC, Zheng J, Birke N, Singh T, Andersson PG. Iridium-catalyzed enantioconvergent hydrogenation of trisubstituted olefins. Nat Commun 2022; 13:361. [PMID: 35042913 PMCID: PMC8766446 DOI: 10.1038/s41467-022-28003-6] [Citation(s) in RCA: 9] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/09/2021] [Accepted: 12/16/2021] [Indexed: 11/28/2022] Open
Abstract
Asymmetric hydrogenation of olefins constitutes a practical and efficient method to introduce chirality into prochiral substrates. However, the absolute majority of the developed methodologies is enantiodivergent and thus require isomerically pure olefins which is a considerable drawback since most olefination strategies produce (E/Z)-mixtures. Although some advances have been reported, a general enantioconvergent hydrogenation featuring a broad functional group tolerance remains elusive. Here, we report the development of a general iridium-catalyzed enantioconvergent hydrogenation of a broad range of functionalized trisubstituted olefins. The substitution pattern around the olefin is critical; whereas α-prochiral olefins can undergo an enantioconvergent hydrogenation, β-prochiral olefins react in an enantiodivergent manner. The presented methodology hydrogenates α-prochiral substrates with excellent control of enantioselection and high isolated yields. Most importantly, both isomerically pure alkenes as well as isomeric mixtures can be hydrogenated to yield the same major enantiomer in excellent enantiomeric excesses which is unusual in transition-metal catalyzed asymmetric hydrogenations. Usually asymmetric hydrogenation of olefins is enantiodivergent and thus requires isomerically pure olefins, which is a considerable drawback. Here, the authors show a general iridium-catalyzed enantioconvergent hydrogenation of a broad range of functionalized trisubstituted olefins.
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Affiliation(s)
- Bram B C Peters
- Department of Organic Chemistry, Stockholm University, Svante Arrhenius väg 16C, SE-10691, Stockholm, Sweden
| | - Jia Zheng
- Department of Organic Chemistry, Stockholm University, Svante Arrhenius väg 16C, SE-10691, Stockholm, Sweden
| | - Norman Birke
- Department of Organic Chemistry, Stockholm University, Svante Arrhenius väg 16C, SE-10691, Stockholm, Sweden
| | - Thishana Singh
- School of Chemistry and Physics, University of Kwazulu-Natal, Private Bag X54001, Durban, 4000, South Africa
| | - Pher G Andersson
- Department of Organic Chemistry, Stockholm University, Svante Arrhenius väg 16C, SE-10691, Stockholm, Sweden. .,School of Chemistry and Physics, University of Kwazulu-Natal, Private Bag X54001, Durban, 4000, South Africa.
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5
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Ehlers S, Szczerbowski D, Harig T, Stell M, Hötling S, Darragh K, Jiggins CD, Schulz S. Identification and Composition of Clasper Scent Gland Components of the Butterfly Heliconius erato and Its Relation to Mimicry. Chembiochem 2021; 22:3300-3313. [PMID: 34547164 PMCID: PMC9293309 DOI: 10.1002/cbic.202100372] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/27/2021] [Revised: 09/20/2021] [Indexed: 12/01/2022]
Abstract
The butterfly Heliconius erato occurs in various mimetic morphs. The male clasper scent gland releases an anti‐aphrodisiac pheromone and additionally contains a complex mixture of up to 350 components, varying between individuals. In 114 samples of five different mimicry groups and their hybrids 750 different compounds were detected by gas chromatography/mass spectrometry (GC/MS). Many unknown components occurred, which were identified using their mass spectra, gas chromatography/infrared spectroscopy (GC/IR)‐analyses, derivatization, and synthesis. Key compounds proved to be various esters of 3‐oxohexan‐1‐ol and (Z)‐3‐hexen‐1‐ol with (S)‐2,3‐dihydrofarnesoic acid, accompanied by a large variety of other esters with longer terpene acids, fatty acids, and various alcohols. In addition, linear terpenes with up to seven uniformly connected isoprene units occur, e. g. farnesylfarnesol. A large number of the compounds have not been reported before from nature. Discriminant analyses of principal components of the gland contents showed that the iridescent mimicry group differs strongly from the other, mostly also separated, mimicry groups. Comparison with data from other species indicated that Heliconius recruits different biosynthetic pathways in a species‐specific manner for semiochemical formation.
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Affiliation(s)
- Stephanie Ehlers
- Technische Universität Braunschweig, Hagenring 30, 38106, Braunschweig, Germany
| | - Daiane Szczerbowski
- Technische Universität Braunschweig, Hagenring 30, 38106, Braunschweig, Germany
| | - Tim Harig
- Technische Universität Braunschweig, Hagenring 30, 38106, Braunschweig, Germany
| | - Matthew Stell
- Technische Universität Braunschweig, Hagenring 30, 38106, Braunschweig, Germany
| | - Susan Hötling
- Technische Universität Braunschweig, Hagenring 30, 38106, Braunschweig, Germany
| | - Kathy Darragh
- Department of Evolution and Ecology, Storer Hall University of California, One Shields Avenue, Davis, CA, 95616, USA
| | - Chris D Jiggins
- Department of Zoology, University of Cambridge, Downing Street, CB2 3EJ, Cambridge, UK
| | - Stefan Schulz
- Technische Universität Braunschweig, Hagenring 30, 38106, Braunschweig, Germany
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6
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Evolution in heterodonor P-N, P-S and P-O chiral ligands for preparing efficient catalysts for asymmetric catalysis. From design to applications. Coord Chem Rev 2021. [DOI: 10.1016/j.ccr.2021.214120] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
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7
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Falk ID, Gál B, Bhattacharya A, Wei JH, Welander PV, Boxer SG, Burns NZ. Enantioselective Total Synthesis of the Archaeal Lipid Parallel GDGT‐0 (Isocaldarchaeol)**. Angew Chem Int Ed Engl 2021. [DOI: 10.1002/ange.202104051] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Isaac D. Falk
- Department of Chemistry Stanford University Stanford CA 94305 USA
| | - Bálint Gál
- Department of Chemistry Stanford University Stanford CA 94305 USA
| | | | - Jeremy H. Wei
- Department of Earth System Science Stanford University Stanford CA 94305 USA
| | - Paula V. Welander
- Department of Earth System Science Stanford University Stanford CA 94305 USA
| | - Steven G. Boxer
- Department of Chemistry Stanford University Stanford CA 94305 USA
| | - Noah Z. Burns
- Department of Chemistry Stanford University Stanford CA 94305 USA
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8
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Andringa RLH, de Kok NAW, Driessen AJM, Minnaard AJ. A Unified Approach for the Total Synthesis of cyclo-Archaeol, iso-Caldarchaeol, Caldarchaeol, and Mycoketide. Angew Chem Int Ed Engl 2021; 60:17497-17503. [PMID: 33929790 PMCID: PMC8362178 DOI: 10.1002/anie.202104759] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/07/2021] [Indexed: 12/25/2022]
Abstract
Ir-catalyzed asymmetric alkene hydrogenation is presented as the strategy par excellence to prepare saturated isoprenoids and mycoketides. This highly stereoselective synthesis approach is combined with an established 13 C-NMR method to determine the enantioselectivity of each methyl-branched stereocenter. It is shown that this analysis is fit for purpose and the combination allows the synthesis of the title compounds with a significant increase in efficiency.
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Affiliation(s)
- Ruben L. H. Andringa
- Stratingh Institute for ChemistryUniversity of GroningenNijenborgh 79747 AGGroningenThe Netherlands
| | - Niels A. W. de Kok
- Department of Molecular MicrobiologyUniversity of GroningenNijenborgh 79747 AGGroningenThe Netherlands
| | - Arnold J. M. Driessen
- Department of Molecular MicrobiologyUniversity of GroningenNijenborgh 79747 AGGroningenThe Netherlands
| | - Adriaan J. Minnaard
- Stratingh Institute for ChemistryUniversity of GroningenNijenborgh 79747 AGGroningenThe Netherlands
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9
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Andringa RLH, Kok NAW, Driessen AJM, Minnaard AJ. A Unified Approach for the Total Synthesis of
cyclo
‐Archaeol,
iso
‐Caldarchaeol, Caldarchaeol, and Mycoketide. Angew Chem Int Ed Engl 2021. [DOI: 10.1002/ange.202104759] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Ruben L. H. Andringa
- Stratingh Institute for Chemistry University of Groningen Nijenborgh 7 9747 AG Groningen The Netherlands
| | - Niels A. W. Kok
- Department of Molecular Microbiology University of Groningen Nijenborgh 7 9747 AG Groningen The Netherlands
| | - Arnold J. M. Driessen
- Department of Molecular Microbiology University of Groningen Nijenborgh 7 9747 AG Groningen The Netherlands
| | - Adriaan J. Minnaard
- Stratingh Institute for Chemistry University of Groningen Nijenborgh 7 9747 AG Groningen The Netherlands
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10
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Schmidt TA, Sparr C. Catalyst Control over Twofold and Higher-Order Stereogenicity by Atroposelective Arene Formation. Acc Chem Res 2021; 54:2764-2774. [PMID: 34056908 DOI: 10.1021/acs.accounts.1c00178] [Citation(s) in RCA: 32] [Impact Index Per Article: 10.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Abstract
Contradictory to the first intuitive impression that forging putatively flat aromatic rings evades stereoisomerism, a striking variety of atropisomeric compounds are conceivable by the formation of arenes, offering captivating avenues for catalyst-controlled stereoselective strategies. Since the assembled atropisomeric products that contain one or several rotationally restricted single bonds are characterized by especially well defined molecular architectures, they are distinctly suitable for numerous pertinent applications. In view of the fascinating arene-forming aldol condensation pathways taking place in polyketide biosynthesis (cyclases/aromatases (CYC/ARO)), the versatile small-molecule-catalyzed aldol reaction appeared as an exceptionally appealing synthetic means to prepare various unexplored atropisomeric compounds in our efforts presented herein. In our initial studies, the use of secondary amine organocatalysts provided excellent selectivities in stereoselective arene-forming aldol condensations for a broad range of atropisomeric products, such as biaryls and rotationally restricted aromatic amides. In further analogy to polyketide biosynthesis, it was also conceivable that several aromatic rings are formed in catalytic cascade reactions. The use of small-molecule catalysts thereby enabled us to transfer this concept to the conversion of unnatural and noncanonical polyketide substrates, thus giving access to atropisomers with particular value for synthetic applications. The versatility of the stereoselective aldol reactions with numerous catalytic activation modes further provided a strategy to individually control several stereogenic axes, similar to the various methodologies developed for controlling stereocenter configurations. By the use of iterative building block additions combined with catalyst-controlled aldol reactions to form the aromatic rings, stereodivergent pathways for catalyst-substrate-matched and -mismatched products were obtained. Besides secondary amines, cinchona-alkaloid-based quaternary ammonium salts also proved to be highly efficient in overcoming severe substrate bias. The obtained atropisomeric multiaxis systems, with all of the biaryl bonds suitably restricted in rotation even at high temperatures, are spatially distinctly defined. The helical secondary structure is therefore excellently suited for several captivating applications.While previous catalyst-controlled stereoselective methods distinguish two stereoisomers for each stereogenic unit, catalyst control beyond the realms of this dualistic stereoisomerism remained unexplored. By the selective preparation of O̅ki atropisomers characterized by their sixfold stereogenicity in Rh-catalyzed [2 + 2 + 2] cyclotrimerizations, one out of the six possible stereoisomers resulting from the restricted rotation of a single bond was shown to be catalytically addressable. Catalyst control over higher-order stereogenicity therefore further interconnects conformational analysis and stereoselective catalysis and offers captivating avenues to explore uncharted stereochemical space for creating a broad range of unprecedented molecular motifs.
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Affiliation(s)
- Tanno A. Schmidt
- Department of Chemistry, University of Basel, St. Johanns-Ring 19, 4056 Basel, Switzerland
| | - Christof Sparr
- Department of Chemistry, University of Basel, St. Johanns-Ring 19, 4056 Basel, Switzerland
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11
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Falk ID, Gál B, Bhattacharya A, Wei JH, Welander PV, Boxer SG, Burns NZ. Enantioselective Total Synthesis of the Archaeal Lipid Parallel GDGT-0 (Isocaldarchaeol)*. Angew Chem Int Ed Engl 2021; 60:17491-17496. [PMID: 33930240 DOI: 10.1002/anie.202104051] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/22/2021] [Indexed: 12/13/2022]
Abstract
Archaeal glycerol dibiphytanyl glycerol tetraethers (GDGT) are some of the most unusual membrane lipids identified in nature. These amphiphiles are the major constituents of the membranes of numerous Archaea, some of which are extremophilic organisms. Due to their unique structures, there has been significant interest in studying both the biophysical properties and the biosynthesis of these molecules. However, these studies have thus far been hampered by limited access to chemically pure samples. Herein, we report a concise and stereoselective synthesis of the archaeal tetraether lipid parallel GDGT-0 and the synthesis and self-assembly of derivatives bearing different polar groups.
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Affiliation(s)
- Isaac D Falk
- Department of Chemistry, Stanford University, Stanford, CA, 94305, USA
| | - Bálint Gál
- Department of Chemistry, Stanford University, Stanford, CA, 94305, USA
| | | | - Jeremy H Wei
- Department of Earth System Science, Stanford University, Stanford, CA, 94305, USA
| | - Paula V Welander
- Department of Earth System Science, Stanford University, Stanford, CA, 94305, USA
| | - Steven G Boxer
- Department of Chemistry, Stanford University, Stanford, CA, 94305, USA
| | - Noah Z Burns
- Department of Chemistry, Stanford University, Stanford, CA, 94305, USA
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12
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Massaro L, Zheng J, Margarita C, Andersson PG. Enantioconvergent and enantiodivergent catalytic hydrogenation of isomeric olefins. Chem Soc Rev 2020; 49:2504-2522. [PMID: 32202283 DOI: 10.1039/c9cs00138g] [Citation(s) in RCA: 27] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
The asymmetric catalytic hydrogenation of olefins is one of the most widely studied and utilised transformations in asymmetric synthesis. This straightforward and atom-economical strategy can provide excellent enantioselectivity for a broad variety of substrates and is widely relevant for both industrial applications and academic research. In many instances the hydrogenation is stereospecific in the regard that the E-Z-geometry of the olefin governs the stereochemistry of the hydrogenation, producing an enantiodivergent outcome. Interestingly, the possibility to hydrogenate E- and Z-isomer mixtures to a single stereoisomer in an enantioconvergent manner has been reported. This avoids the need for synthesis of geometrically pure alkene starting materials and therefore constitutes a significant practical advantage. This review article aims to provide an overview of the different stereochemical outcomes in the hydrogenation of olefins. Although the field is well developed and selectivity models have been proposed for a number of catalytic systems, an organized collection of enantioconvergent results, as opposed to the more common enantiodivergent case, might promote new investigation into these phenomena.
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Affiliation(s)
- Luca Massaro
- Department of Organic Chemistry, Stockholm University, Svante Arrhenius väg 16C, SE-106 91 Stockholm, Sweden.
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13
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Zheng J, Jongcharoenkamol J, Peters BBC, Guhl J, Ponra S, Ahlquist MSG, Andersson PG. Iridium-catalysed enantioselective formal deoxygenation of racemic alcohols via asymmetric hydrogenation. Nat Catal 2019. [DOI: 10.1038/s41929-019-0375-7] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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14
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Ratsch F, Schlundt W, Albat D, Zimmer A, Neudörfl JM, Netscher T, Schmalz HG. Total Synthesis of α-Tocopherol through Enantioselective Iridium-Catalyzed Fragmentation of a Spiro-Cyclobutanol Intermediate. Chemistry 2019; 25:4941-4945. [PMID: 30741456 DOI: 10.1002/chem.201900564] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/05/2019] [Indexed: 11/10/2022]
Abstract
A conceptionally new strategy for the asymmetric (2R-selective) synthesis of α-tocopherol (vitamin E) was developed. In the stereocontrolled key step, a prochiral spiro[chromane-2,3'-cyclobutanol] unit is effectively desymmetrized under C-C bond activation in an unprecedented iridium-catalyzed transformation using (S)-DTBM-SegPhos as a chiral ligand (e.r. 97:3). To complete the synthesis, the side chain was attached through Ru-catalyzed cross-metathesis employing an alkene derived from (R,R)-hexahydrofarnesol. To suppress epimerization during the final hydrogenation, PtO2 had to be used as a catalyst instead of Pd/C. In an alternative approach (employing a propargyl-substituted spiro-cyclobutanol), the side chain was constructed prior to the Ir-catalyzed ring fragmentation (>99:1 d.r.) through enyne cross-metathesis (using an alkene derived from (R)-dihydrocitronellal) followed by Cr-catalyzed 1,4-hydrogenation and (diastereoselective) Pfaltz hydrogenation of the resulting triple-substituted olefin. The work demonstrates the potential of iridium catalysis for enantioselective C-C bond activation.
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Affiliation(s)
- Friederike Ratsch
- Department of Chemistry, University of Cologne, Greinstrasse 4, 50939, Koeln, Germany
| | - Waldemar Schlundt
- Department of Chemistry, University of Cologne, Greinstrasse 4, 50939, Koeln, Germany
| | - Dominik Albat
- Department of Chemistry, University of Cologne, Greinstrasse 4, 50939, Koeln, Germany
| | - Anne Zimmer
- Department of Chemistry, University of Cologne, Greinstrasse 4, 50939, Koeln, Germany
| | - Jörg-Martin Neudörfl
- Department of Chemistry, University of Cologne, Greinstrasse 4, 50939, Koeln, Germany
| | - Thomas Netscher
- Research and Development, DSM Nutritional Products, P.O. Box 2676, CH-4002, Basel, Switzerland
| | - Hans-Günther Schmalz
- Department of Chemistry, University of Cologne, Greinstrasse 4, 50939, Koeln, Germany
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15
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Lotter D, Castrogiovanni A, Neuburger M, Sparr C. Catalyst-Controlled Stereodivergent Synthesis of Atropisomeric Multiaxis Systems. ACS CENTRAL SCIENCE 2018; 4:656-660. [PMID: 29806013 PMCID: PMC5968508 DOI: 10.1021/acscentsci.8b00204] [Citation(s) in RCA: 73] [Impact Index Per Article: 12.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 04/03/2018] [Indexed: 06/08/2023]
Abstract
Molecular scaffolds with multiple rotationally restricted bonds allow a precise spatial positioning of functional groups. However, their synthesis requires methods addressing the configuration of each stereogenic axis. We report here a catalyst-stereocontrolled synthesis of atropisomeric multiaxis systems enabling divergence from the prevailing stereochemical reaction path. By using ion-pairing catalysts in arene-forming aldol condensations, a strong substrate-induced stereopreference can be overcome to provide structurally well-defined helical oligo-1,2-naphthylenes. The configuration of up to four stereogenic axes was individually catalyst-controlled, affording quinquenaphthalenes with a unique topology.
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Affiliation(s)
- Dominik Lotter
- Department of Chemistry, University
of Basel, St. Johanns-Ring
19, 4056 Basel, Switzerland
| | | | - Markus Neuburger
- Department of Chemistry, University
of Basel, St. Johanns-Ring
19, 4056 Basel, Switzerland
| | - Christof Sparr
- Department of Chemistry, University
of Basel, St. Johanns-Ring
19, 4056 Basel, Switzerland
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16
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Menke M, Melnik K, Peram PS, Starnberger I, Hödl W, Vences M, Schulz S. Frogolide - An Unprecedented Sesquiterpene Macrolactone from Scent Glands of African Frogs. European J Org Chem 2018; 2018:2651-2656. [PMID: 30078994 PMCID: PMC6070141 DOI: 10.1002/ejoc.201800199] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/06/2018] [Indexed: 01/15/2023]
Abstract
Some amphibians use chemical signals in addition to optical and acoustical signals to transmit information. Males of mantellid frogs from Madagascar and hyperoliid frogs from Africa emit complex, species- and sex-specific bouquets of volatiles from their femoral or gular glands. We report here on the identification, synthesis, and determination of the absolute configuration of a macrocyclic lactone occurring in several species of both families, (S)-3,7,11-dodec-6,10-dien-12-olide (S-14, frogolide). Macrolides are a preferred compound class of frog volatiles. Nevertheless, frogolide is the first macrocyclic lactone obviously derived from the terpene pathway, in contrast to known frog macrolides that are usually formed via the fatty acid biosynthetic pathway.
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Affiliation(s)
- Markus Menke
- Institute of Organic Chemistry, Technische Universität Braunschweig, Hagenring 30, 38106 Braunschweig, Germany
| | - Kristina Melnik
- Institute of Organic Chemistry, Technische Universität Braunschweig, Hagenring 30, 38106 Braunschweig, Germany
| | - Pardha S. Peram
- Institute of Organic Chemistry, Technische Universität Braunschweig, Hagenring 30, 38106 Braunschweig, Germany
| | - Iris Starnberger
- Department for Integrative Zoology, Althanstraße 14, 1090 Vienna, Austria
| | - Walter Hödl
- Department for Integrative Zoology, Althanstraße 14, 1090 Vienna, Austria
| | - Miguel Vences
- Institute of Zoology, Technische Universität Braunschweig, Mendelsohnstraße 4, 38106 Braunschweig, Germany
| | - Stefan Schulz
- Institute of Organic Chemistry, Technische Universität Braunschweig, Hagenring 30, 38106 Braunschweig, Germany
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17
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Müller MA, Gruber S, Pfaltz A. Recovery and Recycling of Chiral Iridium(N,P Ligand) Catalysts from Hydrogenation Reactions. Adv Synth Catal 2018. [DOI: 10.1002/adsc.201701591] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Marc-André Müller
- Department of Chemistry; University of Basel; St. Johanns-Ring 19 4056 Basel Switzerland
- Current address: DSM Nutritional Products Ltd.; Research and Development; P.O. Box 2676 4002 Basel Switzerland
| | - Stefan Gruber
- Department of Chemistry; University of Basel; St. Johanns-Ring 19 4056 Basel Switzerland
- Current address: Department of Chemistry and Applied Biosciences; ETH Zurich; 8093 Zurich Switzerland
| | - Andreas Pfaltz
- Department of Chemistry; University of Basel; St. Johanns-Ring 19 4056 Basel Switzerland
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18
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Zanotti-Gerosa A, Gazić Smilović I, Časar Z. Acid promoted Ir–P^N complex catalyzed hydrogenation of heavily hindered 3,4-diphenyl-1,2-dihydronaphthalenes: asymmetric synthesis of lasofoxifene tartrate. Org Chem Front 2017. [DOI: 10.1039/c7qo00525c] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
Abstract
An asymmetric hydrogenation of minimally functionalized tetrasubstituted cyclic olefins has been developed using an Ir–P^N catalyst and an acid additive enabling the synthesis of lasofoxifene tartrate.
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Affiliation(s)
| | - Ivana Gazić Smilović
- Lek Pharmaceuticals
- d.d
- Sandoz Development Center Slovenia
- SI-1526 Ljubljana
- Slovenia
| | - Zdenko Časar
- Lek Pharmaceuticals
- d.d
- Sandoz Development Center Slovenia
- SI-1526 Ljubljana
- Slovenia
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19
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Li JQ, Liu J, Krajangsri S, Chumnanvej N, Singh T, Andersson PG. Asymmetric Hydrogenation of Allylic Alcohols Using Ir–N,P-Complexes. ACS Catal 2016. [DOI: 10.1021/acscatal.6b02456] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Affiliation(s)
- Jia-Qi Li
- Department
of Applied Chemistry, China Agricultural University, Beijing, 100193, China
| | - Jianguo Liu
- Department
of Organic Chemistry, Stockholm University, 106 91, Stockholm, Sweden
| | - Suppachai Krajangsri
- Department
of Organic Chemistry, Stockholm University, 106 91, Stockholm, Sweden
| | - Napasawan Chumnanvej
- Department
of Organic Chemistry, Stockholm University, 106 91, Stockholm, Sweden
| | - Thishana Singh
- Department
of Organic Chemistry, Stockholm University, 106 91, Stockholm, Sweden
| | - Pher G. Andersson
- Department
of Organic Chemistry, Stockholm University, 106 91, Stockholm, Sweden
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20
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Lankhorst PP, Netscher T, Duchateau ALL. A Simple13C NMR Method for the Discrimination of Complex Mixtures of Stereoisomers: All Eight Stereoisomers of α-Tocopherol Resolved. Chirality 2015; 27:850-5. [DOI: 10.1002/chir.22535] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/08/2015] [Revised: 08/13/2015] [Accepted: 08/27/2015] [Indexed: 01/08/2023]
Affiliation(s)
| | - Thomas Netscher
- DSM Nutritional Products; Research and Development; Basel Switzerland
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21
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Matsueda Y, Xu S, Negishi EI. A novel highly enantio- and diastereoselective synthesis of vitamin E side-chain. Tetrahedron Lett 2015. [DOI: 10.1016/j.tetlet.2014.12.081] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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22
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Pischl MC, Weise CF, Haseloff S, Müller MA, Pfaltz A, Schneider C. A Highly Stereoselective and Flexible Strategy for the Convergent Synthesis of Long-Chain Polydeoxypropionates: Application towards the Synthesis of the Glycolipid Membrane Components Hydroxyphthioceranic and Phthioceranic Acid. Chemistry 2014; 20:17360-74. [DOI: 10.1002/chem.201404034] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/19/2014] [Indexed: 11/06/2022]
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23
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Lee H, Lee YK, Kim DG, Son MS, Nam TG, Jeong BS. Tocopherol side chain synthesis via asymmetric organocatalytic transfer hydrogenation and convenient measurement of stereoselectivity. Tetrahedron Lett 2014. [DOI: 10.1016/j.tetlet.2014.08.085] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
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24
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Wu Z, Harutyunyan SR, Minnaard AJ. Total synthesis of (R,R,R)-γ-tocopherol through Cu-catalyzed asymmetric 1,2-addition. Chemistry 2014; 20:14250-5. [PMID: 25205372 DOI: 10.1002/chem.201404458] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/17/2014] [Indexed: 11/09/2022]
Abstract
Based on the asymmetric copper-catalyzed 1,2-addition of Grignard reagents to ketones, (R,R,R)-γ-tocopherol has been synthesized in 36 % yield over 12 steps (longest linear sequence). The chiral center in the chroman ring was constructed with 73 % ee by the 1,2-addition of a phytol-derived Grignard reagent to an α-bromo enone prepared from 2,3-dimethylquinone.
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Affiliation(s)
- Zhongtao Wu
- Stratingh Institute for Chemistry, University of Groningen, Nijenborgh 7, 9747 AG, Groningen (The Netherlands)
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25
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Uria U, Vila C, Lin M, Rueping M. Gold‐Catalyzed Asymmetric Allylic Substitution of Free Alcohols: An Enantioselective Approach to Chiral Chromans with Quaternary Stereocenters for the Synthesis of Vitamin E and Analogues. Chemistry 2014; 20:13913-7. [DOI: 10.1002/chem.201403768] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/01/2014] [Indexed: 11/10/2022]
Affiliation(s)
- Uxue Uria
- Institute of Organic Chemistry, Institution RWTH Aachen University, Landoltweg 1, 52074 Aachen (Germany)
| | - Carlos Vila
- Institute of Organic Chemistry, Institution RWTH Aachen University, Landoltweg 1, 52074 Aachen (Germany)
| | - Ming‐Yuan Lin
- Institute of Organic Chemistry, Institution RWTH Aachen University, Landoltweg 1, 52074 Aachen (Germany)
| | - Magnus Rueping
- Institute of Organic Chemistry, Institution RWTH Aachen University, Landoltweg 1, 52074 Aachen (Germany)
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26
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Termath AO, Sebode H, Schlundt W, Stemmler RT, Netscher T, Bonrath W, Schmalz HG. Total synthesis of (R,R,R)-α-tocopherol through asymmetric Cu-catalyzed 1,4-addition. Chemistry 2014; 20:12051-5. [PMID: 25088810 DOI: 10.1002/chem.201404379] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/13/2014] [Indexed: 11/05/2022]
Abstract
By introducing a disposable activating substituent at C-3, the asymmetric 1,4-addition to a notoriously unreactive 2-substituted chromenone was achieved with high levels of (2R)-stereoselectivity in the presence of a chiral Cu(I)-phosphoramidite complex as a catalyst. This paved the way for an efficient and conceptually novel synthesis of (R,R,R)-α-tocopherol from readily available starting materials.
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Affiliation(s)
- Andreas Ole Termath
- Universität zu Köln, Department für Chemie, Greinstrasse 4, 50939 Köln (Germany)
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27
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Termath AO, Velder J, Stemmler RT, Netscher T, Bonrath W, Schmalz HG. Total Synthesis of (2RS)-α-Tocopherol through Ni-Catalyzed 1,4-Addition to a Chromenone Intermediate. European J Org Chem 2014. [DOI: 10.1002/ejoc.201402240] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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28
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Roseblade SJ, Smilović IG, Časar Z. Study of chemoselective asymmetric hydrogenation of (1-bromo-1-alkenyl)boronic esters with iridium–PˆN complexes. Tetrahedron 2014. [DOI: 10.1016/j.tet.2014.02.065] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
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29
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Verendel JJ, Pàmies O, Diéguez M, Andersson PG. Asymmetric Hydrogenation of Olefins Using Chiral Crabtree-type Catalysts: Scope and Limitations. Chem Rev 2013; 114:2130-69. [DOI: 10.1021/cr400037u] [Citation(s) in RCA: 355] [Impact Index Per Article: 32.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- J. Johan Verendel
- Department
of Chemistry - BMC, Uppsala University, Husargatan 3, Box
576, SE-751 23, Uppsala, Sweden
| | - Oscar Pàmies
- Departament
de Química Física i Inorgànica, Universitat Rovira i Virgili, C/Marcelli Domingo, s/n, 43007, Tarragona, Spain
| | - Montserrat Diéguez
- Departament
de Química Física i Inorgànica, Universitat Rovira i Virgili, C/Marcelli Domingo, s/n, 43007, Tarragona, Spain
| | - Pher G. Andersson
- Department
of Chemistry - BMC, Uppsala University, Husargatan 3, Box
576, SE-751 23, Uppsala, Sweden
- Department
of Organic Chemistry, Stockholm University Arrhenius Laboratory, SE-106
91, Stockholm, Sweden
- School
of Chemistry, University of KwaZulu-Natal, University Road, Westville, Durban 4041, South Africa
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30
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Pischl MC, Weise CF, Müller MA, Pfaltz A, Schneider C. Eine konvergente und stereoselektive Synthese der Glycolipidkomponenten Phthioceransäure und Hydroxyphthioceransäure. Angew Chem Int Ed Engl 2013. [DOI: 10.1002/ange.201303776] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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31
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Pischl MC, Weise CF, Müller MA, Pfaltz A, Schneider C. A convergent and stereoselective synthesis of the glycolipid components phthioceranic acid and hydroxyphthioceranic acid. Angew Chem Int Ed Engl 2013; 52:8968-72. [PMID: 23843294 DOI: 10.1002/anie.201303776] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/02/2013] [Indexed: 11/09/2022]
Affiliation(s)
- Matthias C Pischl
- Institute of Organic Chemistry, University of Leipzig, Johannisallee 29, 04103 Leipzig, Germany
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32
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Schumacher A, Bernasconi M, Pfaltz A. Chiral N-Heterocyclic Carbene/Pyridine Ligands for the Iridium-Catalyzed Asymmetric Hydrogenation of Olefins. Angew Chem Int Ed Engl 2013; 52:7422-5. [DOI: 10.1002/anie.201301251] [Citation(s) in RCA: 61] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/12/2013] [Indexed: 11/08/2022]
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33
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Schumacher A, Bernasconi M, Pfaltz A. Chiral N-Heterocyclic Carbene/Pyridine Ligands for the Iridium-Catalyzed Asymmetric Hydrogenation of Olefins. Angew Chem Int Ed Engl 2013. [DOI: 10.1002/ange.201301251] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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34
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Ager DJ, de Vries AHM, de Vries JG. Asymmetric homogeneous hydrogenations at scale. Chem Soc Rev 2012; 41:3340-80. [DOI: 10.1039/c2cs15312b] [Citation(s) in RCA: 266] [Impact Index Per Article: 22.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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35
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Franzke A, Voss F, Pfaltz A. Synthesis of new serine-based phosphinooxazoline ligands and iridium complexes for asymmetric hydrogenations. Tetrahedron 2011. [DOI: 10.1016/j.tet.2011.02.021] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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36
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Franzke A, Pfaltz A. Zwitterionic Iridium Complexes with P,N-Ligands as Catalysts for the Asymmetric Hydrogenation of Alkenes. Chemistry 2011; 17:4131-44. [DOI: 10.1002/chem.201003314] [Citation(s) in RCA: 60] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/17/2010] [Indexed: 11/10/2022]
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37
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Woodmansee DH, Pfaltz A. Asymmetric hydrogenation of alkenes lacking coordinating groups. Chem Commun (Camb) 2011; 47:7912-6. [DOI: 10.1039/c1cc11430a] [Citation(s) in RCA: 185] [Impact Index Per Article: 14.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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38
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Woodmansee DH, Pfaltz A. Iridium-Catalyzed Asymmetric Hydrogenation of Olefins with Chiral N,P and C,N Ligands. TOP ORGANOMETAL CHEM 2011. [DOI: 10.1007/978-3-642-15334-1_3] [Citation(s) in RCA: 60] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
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39
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Chapelat J, Hengartner U, Chougnet A, Liu K, Huebbe P, Rimbach G, Woggon WD. Asymmetric Synthesis and Biological Activity of nor-α-Tocopherol, a New Vitamin E Analogue. Chembiochem 2010; 12:118-24. [DOI: 10.1002/cbic.201000511] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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40
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Xie JB, Xie JH, Liu XY, Zhang QQ, Zhou QL. Chiral Iridium Spiro Aminophosphine Complexes: Asymmetric Hydrogenation of Simple Ketones, Structure, and Plausible Mechanism. Chem Asian J 2010; 6:899-908. [DOI: 10.1002/asia.201000716] [Citation(s) in RCA: 57] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/01/2010] [Indexed: 11/06/2022]
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41
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Wang A, Fraga RPA, Hörmann E, Pfaltz A. Iridium-Catalyzed Asymmetric Hydrogenation of Unfunctionalized, Trialkyl-Substituted Olefins. Chem Asian J 2010; 6:599-606. [DOI: 10.1002/asia.201000595] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/20/2010] [Indexed: 11/06/2022]
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42
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Tian F, Yao D, Liu Y, Xie F, Zhang W. Iridium‐Catalyzed Highly Enantioselective Hydrogenation of Exocyclic α,β‐Unsaturated Carbonyl Compounds. Adv Synth Catal 2010. [DOI: 10.1002/adsc.201000185] [Citation(s) in RCA: 88] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Affiliation(s)
- Fengtao Tian
- School of Chemistry and Chemical Engineering, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai 200240, People's Republic of China, Fax: (+86)‐21‐5474‐3265
| | - Dongmei Yao
- School of Chemistry and Chemical Engineering, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai 200240, People's Republic of China, Fax: (+86)‐21‐5474‐3265
| | - Yuanyuan Liu
- School of Chemistry and Chemical Engineering, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai 200240, People's Republic of China, Fax: (+86)‐21‐5474‐3265
| | - Fang Xie
- School of Chemistry and Chemical Engineering, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai 200240, People's Republic of China, Fax: (+86)‐21‐5474‐3265
| | - Wanbin Zhang
- School of Chemistry and Chemical Engineering, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai 200240, People's Republic of China, Fax: (+86)‐21‐5474‐3265
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43
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Baeza A, Pfaltz A. Iridium-Catalyzed Asymmetric Hydrogenation of N-Protected Indoles. Chemistry 2010; 16:2036-9. [DOI: 10.1002/chem.200903105] [Citation(s) in RCA: 122] [Impact Index Per Article: 8.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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44
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Hengartner U, Chougnet A, Liu K, Woggon WD. Asymmetric Synthesis of α-Tocopherol. Chemistry 2010; 16:1306-11. [DOI: 10.1002/chem.200902754] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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45
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Woodmansee DH, Müller MA, Neuburger M, Pfaltz A. Chiral pyridyl phosphinites with large aryl substituents as efficient ligands for the asymmetric iridium-catalyzed hydrogenation of difficult substrates. Chem Sci 2010. [DOI: 10.1039/c0sc00223b] [Citation(s) in RCA: 63] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
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46
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Krska SW, Mitten JV, Dormer PG, Mowrey D, Machrouhi F, Sun Y, Nelson TD. Enantioselective synthesis of a chiral fluoropiperidine via asymmetric hydrogenation of a vinyl fluoride. Tetrahedron 2009. [DOI: 10.1016/j.tet.2009.06.105] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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47
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Hernández-Torres G, Urbano A, Carreño MC, Colobert F. Stereocontrolled Generation of the (2R) Chroman Core of Vitamin E: Total Synthesis of (2R,4′RS,8′RS)-α-Tocopherol. Org Lett 2009; 11:4930-3. [PMID: 19863149 DOI: 10.1021/ol9020783] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Gloria Hernández-Torres
- Departamento de Química Orgánica (C-I), Universidad Autónoma de Madrid, Cantoblanco, 28049 Madrid, Spain, and Laboratoire de Stéréochimie associé au CNRS, UMR 7509 Université de Strasbourg, ECPM 25 rue Becquerel, 67087 Strasbourg Cedex 2, France
| | - Antonio Urbano
- Departamento de Química Orgánica (C-I), Universidad Autónoma de Madrid, Cantoblanco, 28049 Madrid, Spain, and Laboratoire de Stéréochimie associé au CNRS, UMR 7509 Université de Strasbourg, ECPM 25 rue Becquerel, 67087 Strasbourg Cedex 2, France
| | - M. Carmen Carreño
- Departamento de Química Orgánica (C-I), Universidad Autónoma de Madrid, Cantoblanco, 28049 Madrid, Spain, and Laboratoire de Stéréochimie associé au CNRS, UMR 7509 Université de Strasbourg, ECPM 25 rue Becquerel, 67087 Strasbourg Cedex 2, France
| | - Françoise Colobert
- Departamento de Química Orgánica (C-I), Universidad Autónoma de Madrid, Cantoblanco, 28049 Madrid, Spain, and Laboratoire de Stéréochimie associé au CNRS, UMR 7509 Université de Strasbourg, ECPM 25 rue Becquerel, 67087 Strasbourg Cedex 2, France
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48
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Asymmetric hydrogenation and allylic substitution reaction with novel chiral pinene-derived N,P-ligands. ACTA ACUST UNITED AC 2009. [DOI: 10.1016/j.tetasy.2009.05.020] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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49
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Liu F, Pullarkat SA, Li Y, Chen S, Yuan M, Lee ZY, Leung PH. Highly Enantioselective Synthesis of (2-Pyridyl)phosphine Based C-Chiral Unsymmetrical P,N-Ligands Using a Chiral Palladium Complex. Organometallics 2009. [DOI: 10.1021/om900305u] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Fengli Liu
- Division of Chemistry & Biological Chemistry, School of Physical & Mathematical Sciences, Nanyang Technological University, Singapore 637371, Singapore
| | - Sumod A. Pullarkat
- Division of Chemistry & Biological Chemistry, School of Physical & Mathematical Sciences, Nanyang Technological University, Singapore 637371, Singapore
| | - Yongxin Li
- Division of Chemistry & Biological Chemistry, School of Physical & Mathematical Sciences, Nanyang Technological University, Singapore 637371, Singapore
| | - Shuli Chen
- Division of Chemistry & Biological Chemistry, School of Physical & Mathematical Sciences, Nanyang Technological University, Singapore 637371, Singapore
| | - Mingjun Yuan
- Division of Chemistry & Biological Chemistry, School of Physical & Mathematical Sciences, Nanyang Technological University, Singapore 637371, Singapore
| | - Zhi Yi Lee
- Division of Chemistry & Biological Chemistry, School of Physical & Mathematical Sciences, Nanyang Technological University, Singapore 637371, Singapore
| | - Pak-Hing Leung
- Division of Chemistry & Biological Chemistry, School of Physical & Mathematical Sciences, Nanyang Technological University, Singapore 637371, Singapore
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50
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Zhao J, Burgess K. Aldol-Type Chirons from Asymmetric Hydrogenations of Trisubstituted Alkenes. Org Lett 2009; 11:2053-6. [DOI: 10.1021/ol900308w] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Jian Zhao
- Texas A & M University, Chemistry Department,P.O. Box 30012, College Station, Texas 77842
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