1
|
Calogero F, Gualandi A, Matteo MD, Potenti S, Fermi A, Bergamini G, Cozzi PG. Photoredox Propargylation of Aldehydes Catalytic in Titanium. J Org Chem 2021; 86:7002-7009. [PMID: 33884879 PMCID: PMC8279488 DOI: 10.1021/acs.joc.1c00521] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
![]()
A practical and effective
photoredox propargylation of aldehydes
promoted by 10 mol % of [Cp2TiCl2] is presented.
No stoichiometric metals or scavengers are used for the process. A
catalytic amount of the cheap and simply prepared organic dye 3DPAFIPN
is used as the reductant for titanium. The reaction displayed a broad
scope, and no traces of allenyl isomers were detected for simple propargyl
bromide, whereas mixtures of propargyl and allenyl isomers were observed
for substituted propargyl bromides.
Collapse
Affiliation(s)
- Francesco Calogero
- Alma Mater Studiorum, Università di Bologna, Dipartimento di Chimica "G. Ciamician", Via Selmi 2, 40126 Bologna, Italy
| | - Andrea Gualandi
- Alma Mater Studiorum, Università di Bologna, Dipartimento di Chimica "G. Ciamician", Via Selmi 2, 40126 Bologna, Italy
| | - Marco Di Matteo
- Alma Mater Studiorum, Università di Bologna, Dipartimento di Chimica "G. Ciamician", Via Selmi 2, 40126 Bologna, Italy
| | - Simone Potenti
- Alma Mater Studiorum, Università di Bologna, Dipartimento di Chimica "G. Ciamician", Via Selmi 2, 40126 Bologna, Italy.,Scuola Normale Superiore, Piazza dei Cavalieri 7, 56126 Pisa, Italy
| | - Andrea Fermi
- Alma Mater Studiorum, Università di Bologna, Dipartimento di Chimica "G. Ciamician", Via Selmi 2, 40126 Bologna, Italy
| | - Giacomo Bergamini
- Alma Mater Studiorum, Università di Bologna, Dipartimento di Chimica "G. Ciamician", Via Selmi 2, 40126 Bologna, Italy
| | - Pier Giorgio Cozzi
- Alma Mater Studiorum, Università di Bologna, Dipartimento di Chimica "G. Ciamician", Via Selmi 2, 40126 Bologna, Italy
| |
Collapse
|
2
|
Kolyvanov NA, Oparina LA, Tarasova OA, Albanov AI, Gusarova NK, Trofimov BA. Pd-catalyzed rearrangement of ferrocenylalkyl vinyl ethers to the related aldehydes and ketones. Tetrahedron Lett 2020. [DOI: 10.1016/j.tetlet.2020.152110] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
|
3
|
Bo Z, Ji-Jun Z, Sheng H, Dong-Huai T, Jiang-Wei L, Wei Z, Jian L. Base-catalyzed stereoselective hydrophenoxylation and hydrothiolation of hexafluorobutyne. Tetrahedron Lett 2020. [DOI: 10.1016/j.tetlet.2020.151693] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
|
4
|
Yalamanchili S, Miller W, Chen X, Bennett CS. Rapid de Novo Preparation of 2,6-Dideoxy Sugar Libraries through Gold-Catalyzed Homopropargyl Orthoester Cyclization. Org Lett 2019; 21:9646-9651. [PMID: 31755271 PMCID: PMC6956608 DOI: 10.1021/acs.orglett.9b03812] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
A flexible de novo route capable of producing libraries of 2,6-dideoxy sugars is described. We have found that Au(JackiePhos)SbF6MeCN promotes the conversion of homopropargyl orthoesters into functionalized 2,3-dihydro-4H-pyran-4-ones in good to excellent yields (71-90%). These latter compounds can be easily converted into a number of otherwise difficult to access 2,6-dideoxy sugars.
Collapse
Affiliation(s)
- Subbarao Yalamanchili
- Department of Chemistry, Tufts University, 62 Talbot Avenue, Medford, Massachusetts 02155, United States
| | - William Miller
- Department of Chemistry, Tufts University, 62 Talbot Avenue, Medford, Massachusetts 02155, United States
| | - Xizhao Chen
- Department of Chemistry, Tufts University, 62 Talbot Avenue, Medford, Massachusetts 02155, United States
| | - Clay S. Bennett
- Department of Chemistry, Tufts University, 62 Talbot Avenue, Medford, Massachusetts 02155, United States
| |
Collapse
|
5
|
Cabezas JA, Fernandez CSC. Ethyl 5-[(ethoxycarbonyl)oxy]-5,5-diphenylpent-2-ynoate. IUCRDATA 2019. [DOI: 10.1107/s2414314619015268] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022] Open
Abstract
The title compound, C22H22O5, crystallizes with two molecules in the asymmetric unit, one of which shows disorder of its ethyl acetate group over two sets of sites in a 0.880 (2):0.120 (2) ratio. The C[triple-bond]C distances in the two molecules are almost the same [1.1939 (16) and 1.199 (2) Å], but the Csp
3—C[triple-bond]C angles differ somewhat [175.92 (12) and 172.53 (16)°]. In the crystal, several weak C—H...O interactions are seen.
Collapse
|
6
|
Alonso JM, Muñoz MP. Platinum and Gold Catalysis: à la Carte Hydroamination of Terminal Activated Allenes with Azoles. Org Lett 2019; 21:7639-7644. [DOI: 10.1021/acs.orglett.9b02949] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Affiliation(s)
- José Miguel Alonso
- School of Chemistry, University of East Anglia, Norwich NR4 7TJ, United Kingdom
| | - María Paz Muñoz
- School of Chemistry, University of East Anglia, Norwich NR4 7TJ, United Kingdom
| |
Collapse
|
7
|
Stereoselective synthesis of medium lactams enabled by metal-free hydroalkoxylation/stereospecific [1,3]-rearrangement. Nat Commun 2019; 10:3234. [PMID: 31324800 PMCID: PMC6642132 DOI: 10.1038/s41467-019-11245-2] [Citation(s) in RCA: 93] [Impact Index Per Article: 15.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/02/2019] [Accepted: 07/02/2019] [Indexed: 12/23/2022] Open
Abstract
Rearrangement reactions have attracted considerable interest over the past decades due to their high bond-forming efficiency and atom economy in the construction of complex organic architectures. In contrast to the well-established [3,3]-rearrangement, [1,3] O-to-C rearrangement has been far less vigorously investigated, and stereospecific [1,3]-rearrangement is extremely rare. Here, we report a metal-free intramolecular hydroalkoxylation/[1,3]-rearrangement, leading to the practical and atom-economical assembly of various valuable medium-sized lactams with wide substrate scope and excellent diastereoselectivity. Moreover, such an asymmetric cascade cyclization has also been realized by chiral Brønsted acid-catalyzed kinetic resolution. In addition, biological tests reveal that some of these medium-sized lactams displayed their bioactivity as antitumor agents against melanoma cells, esophageal cancer cells and breast cancer cells. A mechanistic rationale for the reaction is further supported by control experiments and theoretical calculations. Stereospecific [1,3]-rearrangements are rarely reported method to efficiently build complex organic architectures. Here, the authors describe a metal-free intramolecular hydroalkoxylation/[1,3]-rearrangement sequence affording medium-sized lactams with wide scope, also in an asymmetric fashion.
Collapse
|
8
|
Monasterolo C, Müller-Bunz H, Gilheany DG. Very short highly enantioselective Grignard synthesis of 2,2-disubstituted tetrahydrofurans and tetrahydropyrans. Chem Sci 2019; 10:6531-6538. [PMID: 31341606 PMCID: PMC6611064 DOI: 10.1039/c9sc00978g] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/26/2019] [Accepted: 05/25/2019] [Indexed: 12/17/2022] Open
Abstract
Phenones with elongated chains are shown to be excellent substrates for ligand-promoted asymmetric Grignard synthesis of tertiary alcohols. In turn this enables the simple, short and highly enantioselective (up to 96% ee) preparation of chiral 2,2-disubstituted THFs and THPs. Thus, asymmetric addition of Grignard reagents to γ-chlorobutyrophenones and δ-chlorovalerophenones takes place in the presence of a chiral diaminocyclohexyl-derived tridentate ligand and subsequent base-promoted intramolecular cyclisation occurs with complete retention of asymmetry. As examples of the methodology, we report the shortest syntheses of gossonorol, γ-ethyl-γ-phenylbutyrolactone and δ-methyl-δ-tolylvalerolactone, the joint-shortest and flexible synthesis of boivinianin A and the shortest formal syntheses of boivinianin B and yingzhaosu C.
Collapse
Affiliation(s)
- Claudio Monasterolo
- Centre for Synthesis and Chemical Biology , School of Chemistry , University College Dublin , Belfield , Dublin 4 , Ireland . ;
| | - Helge Müller-Bunz
- Centre for Synthesis and Chemical Biology , School of Chemistry , University College Dublin , Belfield , Dublin 4 , Ireland . ;
| | - Declan G Gilheany
- Centre for Synthesis and Chemical Biology , School of Chemistry , University College Dublin , Belfield , Dublin 4 , Ireland . ;
| |
Collapse
|
9
|
Phosphines featuring a hexafluorocyclopentene skeleton: Synthesis, coordination properties, and applications for Lewis-acidic transition-metal catalysts. RESULTS IN CHEMISTRY 2019. [DOI: 10.1016/j.rechem.2019.100008] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022] Open
|
10
|
Umaña CA, Pineda LW, Cabezas JA. 1,1-Diphenyl-4-(thiophen-2-yl)but-3-yn-1-ol. IUCRDATA 2018. [DOI: 10.1107/s2414314618016164] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022] Open
Abstract
The asymmetric unit of the title homopropargyl alcohol, C20H16OS, contains two independent molecules comprising a hydroxy group, a 3-(2-thiophenyl)propargylic moiety and two aromatic rings linked to a central carbon atom. The two unique molecules are linked into a dimer by an O—H...O hydrogen bond. In one molecule, the thiophene ring is disordered over two orientations rotated by 180° with a refined occupancy ratio of 0.575 (4):0.425 (4). The crystal structure is stabilized by O—H...π and C—H...π hydrogen-bond interactions. The crystal studied was a two-component non-merohedral twin, the refined ratio of the twin components being 0.575 (4):0.425 (4).
Collapse
|
11
|
Abstract
The asymmetric unit of the title compound, C16H14O, contains one molecule with a central carbon atom having a distorted tetrahedral geometry made of a propargylic fragment, a hydroxy group and two aromatic rings. Directional interactions such as unusual O—H...π contacts are observed between the molecules in the crystal.
Collapse
|
12
|
Umaña CA, Pineda LW, Cabezas JA. Homopropargyl alcohol 5,5-diphenylpent-2-yne-1,5-diol. IUCRDATA 2018. [DOI: 10.1107/s2414314618016188] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
Abstract
In the title compound, C17H16O2, the central carbon atom has a distorted tetrahedral geometry [spread of angles = 105.71 (8)–112.75 (9)°] for its bonds to a homopropargylic but-2-yn-1-ol moiety, a hydroxy group and two phenyl substituents. In the crystal, O—H...O hydrogen-bonding interactions link the molecules into [001] chains and C—H...π(ring) contacts consolidate the packing.
Collapse
|
13
|
Moreno‐Alcántar G, Hernández‐Toledo H, Guevara‐Vela JM, Rocha‐Rinza T, Martín Pendás Á, Flores‐Álamo M, Torrens H. Stability and
trans
Influence in Fluorinated Gold(I) Coordination Compounds. Eur J Inorg Chem 2018. [DOI: 10.1002/ejic.201800567] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Affiliation(s)
- Guillermo Moreno‐Alcántar
- Faculty of Chemistry Universidad Nacional Autónoma de México Ciudad Universitaria 04510 Coyoacán México
| | - Hugo Hernández‐Toledo
- Faculty of Chemistry Universidad Nacional Autónoma de México Ciudad Universitaria 04510 Coyoacán México
| | - José Manuel Guevara‐Vela
- Department of Physical and Analytical Chemistry Universidad de Oviedo Julián Clavería 8 E‐33006 Oviedo Spain
| | - Tomás Rocha‐Rinza
- Institute of Chemistry Universidad Nacional Autónoma de México Ciudad Universitaria 04510 Coyoacán México
| | - Ángel Martín Pendás
- Department of Physical and Analytical Chemistry Universidad de Oviedo Julián Clavería 8 E‐33006 Oviedo Spain
| | - Marcos Flores‐Álamo
- Faculty of Chemistry Universidad Nacional Autónoma de México Ciudad Universitaria 04510 Coyoacán México
| | - Hugo Torrens
- Faculty of Chemistry Universidad Nacional Autónoma de México Ciudad Universitaria 04510 Coyoacán México
| |
Collapse
|
14
|
Agou T, Wada N, Fujisawa K, Hosoya T, Mizuhata Y, Tokitoh N, Fukumoto H, Kubota T. Syntheses and Structures of d 10 Coinage Metal Complexes of Electron-Accepting Phosphine Ligands Featuring a 3,3,4,4,5,5-Hexafluorocyclopentene Framework. Inorg Chem 2018; 57:9105-9114. [PMID: 29984577 DOI: 10.1021/acs.inorgchem.8b01111] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Cu(I), Ag(I), and Au(I) complexes of monophosphine or bisphosphine ligands based on the 3,3,4,4,5,5-hexafluorocyclopentene skeleton were synthesized and structurally characterized by X-ray crystallographic analysis. The electron-withdrawing nature of these polyfluorinated phosphines was experimentally revealed via UV/vis absorption studies and crystal structure analysis. Successful catalytic application of the Au(I) complex for alkyne hydration reactions was investigated.
Collapse
Affiliation(s)
- Tomohiro Agou
- Department of Quantum Beam Science, Graduate School of Science and Engineering , Ibaraki University , 4-12-1, Nakanarusawa , Hitachi , Ibaraki 316-8511 , Japan
| | - Nao Wada
- Department of Quantum Beam Science, Graduate School of Science and Engineering , Ibaraki University , 4-12-1, Nakanarusawa , Hitachi , Ibaraki 316-8511 , Japan
| | - Kiyoshi Fujisawa
- Department of Chemistry, Faculty of Science , Ibaraki University , Mito , Ibaraki 310-8512 , Japan
| | - Takaaki Hosoya
- Department of Quantum Beam Science, Graduate School of Science and Engineering , Ibaraki University , 4-12-1, Nakanarusawa , Hitachi , Ibaraki 316-8511 , Japan
| | - Yoshiyuki Mizuhata
- Institute for Chemical Research , Kyoto University , Gokasho, Uji , Kyoto 611-0011 , Japan
| | - Norihiro Tokitoh
- Institute for Chemical Research , Kyoto University , Gokasho, Uji , Kyoto 611-0011 , Japan
| | - Hiroki Fukumoto
- Department of Quantum Beam Science, Graduate School of Science and Engineering , Ibaraki University , 4-12-1, Nakanarusawa , Hitachi , Ibaraki 316-8511 , Japan
| | - Toshio Kubota
- Department of Quantum Beam Science, Graduate School of Science and Engineering , Ibaraki University , 4-12-1, Nakanarusawa , Hitachi , Ibaraki 316-8511 , Japan
| |
Collapse
|
15
|
Umaña CA, Cabezas JA. Palladium-Catalyzed One-Pot Conversion of Aldehydes and Ketones into 4-Substituted Homopropargyl Alcohols and 5-En-3-yn-1-ols †. J Org Chem 2017; 82:9505-9514. [PMID: 28841317 DOI: 10.1021/acs.joc.7b01529] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
Sequential treatment of 2,3-dichloropropene with magnesium and n-BuLi generated the equivalent of 1,3-dilithiopropyne, which adds regiospecifically to aldehydes and ketones to produce homopropargyl alcohols. The lithium acetylide intermediate formed in this protocol can be further reacted with aromatic and vinyl halides, under palladium catalysis, to produce 4-substituted homopropargyl alcohols and 5-en-3-yn-1-ols, respectively, in one-pot with good overall yields.
Collapse
Affiliation(s)
- Christian A Umaña
- Escuela de Química, Universidad de Costa Rica , San José, 2060, Costa Rica
| | - Jorge A Cabezas
- Escuela de Química, Universidad de Costa Rica , San José, 2060, Costa Rica
| |
Collapse
|