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Bulman Page PC, Almutairi SM, Chan Y, Stephenson GR, Gama Y, Goodyear RL, Douteau A, Allin SM, Jones GA. Asymmetric Oxidation of Enol Derivatives to α-Alkoxy Carbonyls Using Iminium Salt Catalysts: A Synthetic and Computational Study. J Org Chem 2019; 84:544-559. [PMID: 30548068 DOI: 10.1021/acs.joc.8b02354] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Abstract
We report herein the first examples of asymmetric oxidation of enol ether and ester substrates using iminium salt organocatalysis, affording moderate to excellent enantioselectivities of up to 98% ee for tetralone-derived substrates in the α-hydroxyketone products. A comprehensive density functional theory study was undertaken to interpret the competing diastereoisomeric transition states in this example in order to identify the origins of enantioselectivity. The calculations, performed at the B3LYP/6-31G(D) level of theory, gave good agreement with the experimental results, in terms of the magnitude of the effects under the specified reaction conditions, and in terms of the preferential formation of the ( R)-enantiomer. Just one of the 30 characterized transition states dominates the enantioselectivity, which is attributed to the adoption of an orientation relative to stereochemical features of the chiral controlling element that combines a CH-π interaction between a CH2 group in the substrate and one of the aromatic rings of the biaryl section of the chiral auxiliary with a good alignment of the acetoxy group with the other biaryl ring, and places the smallest substituent on the alkene (a hydrogen atom) in the most sterically hindered position.
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Affiliation(s)
- Philip C Bulman Page
- School of Chemistry , University of East Anglia , Norwich Research Park , Norwich , Norfolk NR4 7TJ , U.K
| | - Saud M Almutairi
- School of Chemistry , University of East Anglia , Norwich Research Park , Norwich , Norfolk NR4 7TJ , U.K
| | - Yohan Chan
- School of Chemistry , University of East Anglia , Norwich Research Park , Norwich , Norfolk NR4 7TJ , U.K
| | - G Richard Stephenson
- School of Chemistry , University of East Anglia , Norwich Research Park , Norwich , Norfolk NR4 7TJ , U.K
| | - Yannick Gama
- School of Chemistry , University of East Anglia , Norwich Research Park , Norwich , Norfolk NR4 7TJ , U.K
| | - Ross L Goodyear
- School of Chemistry , University of East Anglia , Norwich Research Park , Norwich , Norfolk NR4 7TJ , U.K
| | - Alice Douteau
- School of Chemistry , University of East Anglia , Norwich Research Park , Norwich , Norfolk NR4 7TJ , U.K
| | - Steven M Allin
- Department of Chemistry and Forensics , Nottingham Trent University , Clifton , Nottingham NG11 8NS , U.K
| | - Garth A Jones
- School of Chemistry , University of East Anglia , Norwich Research Park , Norwich , Norfolk NR4 7TJ , U.K
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Kovács B, Savela R, Honkala K, Murzin DY, Forró E, Fülöp F, Leino R. Racemization of Secondary-Amine-Containing Natural Products Using Heterogeneous Metal Catalysts. ChemCatChem 2018. [DOI: 10.1002/cctc.201800293] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
Affiliation(s)
- Barbara Kovács
- Laboratory of Organic Chemistry; Åbo Akademy University; Turku Finland
- Johan Gadolin Process Chemistry Centre; Åbo Akademy University; Turku Finland
- Institute of Pharmaceutical Chemistry; University of Szeged; Szeged Hungary
| | - Risto Savela
- Laboratory of Organic Chemistry; Åbo Akademy University; Turku Finland
- Johan Gadolin Process Chemistry Centre; Åbo Akademy University; Turku Finland
| | - Karoliina Honkala
- Department of Chemistry Nanoscience Center; University of Jyväskylä; Jyväskylä Finland
| | - Dmitry Yu. Murzin
- Johan Gadolin Process Chemistry Centre; Åbo Akademy University; Turku Finland
- Laboratory of Industrial Chemistry and Reaction Engineering; Åbo Akademy University; Turku Finland
| | - Enikő Forró
- Institute of Pharmaceutical Chemistry; University of Szeged; Szeged Hungary
| | - Ferenc Fülöp
- Institute of Pharmaceutical Chemistry; University of Szeged; Szeged Hungary
| | - Reko Leino
- Laboratory of Organic Chemistry; Åbo Akademy University; Turku Finland
- Johan Gadolin Process Chemistry Centre; Åbo Akademy University; Turku Finland
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Långvik O, Sandberg T, Wärnå J, Murzin DY, Leino R. One-pot synthesis of (R)-2-acetoxy-1-indanone from 1,2-indanedione combining metal catalyzed hydrogenation and chemoenzymatic dynamic kinetic resolution. Catal Sci Technol 2015. [DOI: 10.1039/c4cy01099j] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A heterogeneously catalyzed one-pot reaction for synthesis of (R)-2-acetoxy-1-indanone is described.
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Affiliation(s)
- Otto Långvik
- Laboratory of Organic Chemistry
- Åbo Akademi University
- FI-20500 Åbo
- Finland
| | - Thomas Sandberg
- Laboratory of Physical Chemistry
- Åbo Akademi University
- FI-20500 Åbo
- Finland
| | - Johan Wärnå
- Laboratory of Industrial Chemistry and Reaction Engineering
- Process Chemistry Centre
- Åbo Akademi University
- FI-20500 Åbo
- Finland
| | - Dmitry Yu. Murzin
- Laboratory of Industrial Chemistry and Reaction Engineering
- Process Chemistry Centre
- Åbo Akademi University
- FI-20500 Åbo
- Finland
| | - Reko Leino
- Laboratory of Organic Chemistry
- Åbo Akademi University
- FI-20500 Åbo
- Finland
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Leong GJ, Ebnonnasir A, Schulze MC, Strand MB, Ngo C, Maloney D, Frisco SL, Dinh HN, Pivovar B, Gilmer GH, Kodambaka S, Ciobanu CV, Richards RM. Shape-directional growth of Pt and Pd nanoparticles. NANOSCALE 2014; 6:11364-11371. [PMID: 25142814 DOI: 10.1039/c4nr02755h] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
The design and synthesis of shape-directed nanoscale noble metal particles have attracted much attention due to their enhanced catalytic properties and the opportunities to study fundamental aspects of nanoscale systems. As such, numerous methods have been developed to synthesize crystals with tunable shapes, sizes, and facets by adding foreign species that promote or restrict growth on specific sites. Many hypotheses regarding how and why certain species direct growth have been put forward, however there has been no consensus on a unifying mechanism of nanocrystal growth. Herein, we develop and demonstrate the capabilities of a mathematical growth model for predicting metal nanoparticle shapes by studying a well known procedure that employs AgNO3 to produce {111} faceted Pt nanocrystals. The insight gained about the role of auxiliary species is then utilized to predict the shape of Pd nanocrystals and to corroborate other shape-directing syntheses reported in literature. The fundamental understanding obtained herein by combining modeling with experimentation is a step toward computationally guided syntheses and, in principle, applicable to predictive design of the growth of crystalline solids at all length scales (nano to bulk).
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Affiliation(s)
- G Jeremy Leong
- Department of Chemistry and Geochemistry, Colorado School of Mines, Golden, Colorado 80401, USA.
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McInturff EL, Mowat J, Waldeck AR, Krische MJ. Ruthenium-catalyzed hydrohydroxyalkylation of acrylates with diols and α-hydroxycarbonyl compounds to form spiro- and α-methylene-γ-butyrolactones. J Am Chem Soc 2013; 135:17230-5. [PMID: 24187991 DOI: 10.1021/ja410533y] [Citation(s) in RCA: 65] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
Abstract
Under the conditions of ruthenium(0)-catalyzed hydrohydroxyalkylation, vicinal diols 1a-1l and methyl acrylate 2a are converted to the corresponding lactones 3a-3l in good to excellent yield. The reactions of methyl acrylate 2a with hydrobenzoin 1f, benzoin didehydro-1f, and benzil tetradehydro-1f form the same lactone 3f product, demonstrating that this process may be deployed in a redox level-independent manner. A variety of substituted acrylic esters 2a-2h participate in spirolactone formation, as illustrated in the conversion of N-benzyl-3-hydroxyoxindole 1o to cycloadducts 4a-4h. Hydrohydroxyalkylation of hydroxyl-substituted methacrylate 2i with diols 1b, 1f, 1j, and 1l forms α-exo-methylene-γ-butyrolactones 5b, 5f, 5j, and 5l in moderate to good yield. A catalytic cycle involving 1,2-dicarbonyl-acrylate oxidative coupling to form oxaruthenacyclic intermediates is postulated. A catalytically competent mononuclear ruthenium(II) complex was characterized by single-crystal X-ray diffraction. The influence of electronic effects on regioselectivity in reactions of nonsymmetric diols was probed using para-substituted 1-phenyl-1,2-propanediols 1g, 1m, and 1n and density functional theory calculations.
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Affiliation(s)
- Emma L McInturff
- Department of Chemistry and Biochemistry, University of Texas at Austin , Austin, Texas 78712, United States
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