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Huang B, He Y, Levin MD, Coelho JAS, Bergman RG, Toste FD. Enantioselective Kinetic Resolution/Desymmetrization of Para-Quinols: A Case Study in Boronic-Acid-Directed Phosphoric Acid Catalysis. Adv Synth Catal 2020; 362:295-301. [PMID: 34093103 DOI: 10.1002/adsc.201900816] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Abstract
A chiral phosphoric acid-catalyzed kinetic resolution and desymmetrization of para-quinols operating via oxa-Michael addition was developed and subsequently subjected to mechanistic study. Good to excellent s-factors/enantioselectivities were obtained over a broad range of substrates. Kinetic studies were performed, and DFT studies favor a hydrogen bonding activation mode. The mechanistic studies provide insights to previously reported chiral anion phase transfer reactions involving chiral phosphate catalysts in combination with boronic acids.
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Affiliation(s)
- Banruo Huang
- Department of Chemistry, University of California, Berkeley, Berkeley, CA 94720 (USA)
| | - Ying He
- Department of Chemistry, University of California, Berkeley, Berkeley, CA 94720 (USA)
| | - Mark D Levin
- Department of Chemistry, University of California, Berkeley, Berkeley, CA 94720 (USA)
| | - Jaime A S Coelho
- Department of Chemistry, University of California, Berkeley, Berkeley, CA 94720 (USA).,Research Institute for Medicines (iMed.ULisboa), Faculty of Pharmacy, Universidade de Lisboa, Lisbon, Portugal
| | - Robert G Bergman
- Department of Chemistry, University of California, Berkeley, Berkeley, CA 94720 (USA)
| | - F Dean Toste
- Department of Chemistry, University of California, Berkeley, Berkeley, CA 94720 (USA)
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2
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Zhou X, Zhao Y, Cao Y, He L. Catalytic Efficient Nazarov Reaction of Unactivated Aryl Vinyl Ketones via a Bidentate Diiron Lewis Acid Activation Strategy. Adv Synth Catal 2017. [DOI: 10.1002/adsc.201700820] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Xin Zhou
- School of Chemsitry and Chemical Engineering; Southwest University; Chongqing 400715 People's Republic of China
| | - Yukun Zhao
- School of Chemsitry and Chemical Engineering; Southwest University; Chongqing 400715 People's Republic of China
| | - Yang Cao
- School of Chemsitry and Chemical Engineering; Southwest University; Chongqing 400715 People's Republic of China
| | - Lirong He
- School of Chemsitry and Chemical Engineering; Southwest University; Chongqing 400715 People's Republic of China
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Carlsen PN, Mann TJ, Hoveyda AH, Frontier AJ. Synthesis of (±)-tetrapetalone A-Me aglycon. Angew Chem Int Ed Engl 2014; 53:9334-8. [PMID: 25045072 PMCID: PMC4260470 DOI: 10.1002/anie.201404410] [Citation(s) in RCA: 41] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/17/2014] [Indexed: 11/07/2022]
Abstract
The first synthesis of (±)-tetrapetalone A-Me aglycon is described. Key bond-forming reactions include Nazarov cyclization, a ring-closing metathesis promoted with complete diastereoselectivity by a chiral molybdenum-based complex, tandem conjugate reduction/intramolecular aldol cyclization, and oxidative dearomatization.
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Affiliation(s)
- Peter N. Carlsen
- Department of Chemistry, University of Rochester, Rochester, NY, 14627 (USA)
| | - Tyler J. Mann
- Department of Chemistry, Merkert Chemistry Center, Boston College, Chestnut Hill, MA 02467 (USA)
| | - Amir H. Hoveyda
- Department of Chemistry, Merkert Chemistry Center, Boston College, Chestnut Hill, MA 02467 (USA)
| | - Alison J. Frontier
- Department of Chemistry, University of Rochester, Rochester, NY, 14627 (USA)
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Carlsen PN, Mann TJ, Hoveyda AH, Frontier AJ. Synthesis of (±)-Tetrapetalone A-Me Aglycon. Angew Chem Int Ed Engl 2014. [DOI: 10.1002/ange.201404410] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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5
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Marcus A, Lee A, Davis R, Tantillo D, Sarpong R. Pronounced Steric Effects of Substituents in the Nazarov Cyclization of Aryl Dienyl Ketones. Angew Chem Int Ed Engl 2008. [DOI: 10.1002/ange.200801542] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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6
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Marcus A, Lee A, Davis R, Tantillo D, Sarpong R. Pronounced Steric Effects of Substituents in the Nazarov Cyclization of Aryl Dienyl Ketones. Angew Chem Int Ed Engl 2008; 47:6379-83. [DOI: 10.1002/anie.200801542] [Citation(s) in RCA: 63] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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7
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Kanada R, Itoh D, Nagai M, Niijima J, Asai N, Mizui Y, Abe S, Kotake Y. Total Synthesis of the Potent Antitumor Macrolides Pladienolide B and D. Angew Chem Int Ed Engl 2007. [DOI: 10.1002/ange.200790236] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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8
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Kanada R, Itoh D, Nagai M, Niijima J, Asai N, Mizui Y, Abe S, Kotake Y. Total Synthesis of the Potent Antitumor Macrolides Pladienolide B and D. Angew Chem Int Ed Engl 2007. [DOI: 10.1002/anie.200790236] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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9
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Fürstner A, Bonnekessel M, Blank JT, Radkowski K, Seidel G, Lacombe F, Gabor B, Mynott R. Total Synthesis of Myxovirescin A1. Chemistry 2007; 13:8762-83. [PMID: 17768720 DOI: 10.1002/chem.200700926] [Citation(s) in RCA: 79] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Abstract
A convergent total synthesis of the antibiotic macrolide myxovirescin A1 (1) is described that is largely based on reagent- and catalyst-controlled transformations. This includes a highly regioselective Negishi reaction of dibromo-alkene 48 with an alkynylzinc reagent, and a palladium catalyzed alkyl-Suzuki coupling of the resulting enyne derivative 12 with the 9-BBN-adduct derived from alkene 61. The latter was obtained via an asymmetric hydrogenation of the chlorinated beta-ketoester 49 and an anti-selective oxyallylation of the functionalized aldehyde 53 as the key steps. The preparation of the bis-borylated allyl-donor 57 used in the oxyallylation step, however, required careful optimization and led to important insights into the nature of the classical hydroborating agent "di(isopinocampheyl)borane (Ipc2BH)". It was unambiguously shown by X-ray crystallography that in the solid state this compound is dimeric, but it is prone to undergo an essentially quantitative mono-deborylation when dissolved in CH2Cl2 or benzene; its composition in ethereal solvents is even more complex as evident from 11B NMR data. Product 71 derived from 12 and 61 was elaborated into the enyne-yne derivative 75, which served as the substrate for an exquisitely selective ring closing alkyne metathesis reaction (RCAM) catalyzed by the molybdenum tris-amido complex 20 activated in situ with CH2Cl2. The resulting cyclic enyne 76 was subjected to a ruthenium catalyzed trans-hydrosilylation/proto-desilylation tandem. Although [Cp*Ru(MeCN)3]PF6 had previously been recommended as catalyst of choice for trans-hydrosilylation reactions of internal alkynes, this complex failed to afford the desired product, whereas its sterically less hindered congener [CpRu(MeCN)3]PF6 permitted the reaction to be performed in appreciable yield, but at the expense of a lower stereoselectivity. AgF-mediated proto-desilylation of the isomeric silanes 79 and 80 followed by cleavage of the remaining acetal protecting groups afforded myxovirescin A1 and its hitherto unknown 14Z-isomer 81, respectively.
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Affiliation(s)
- Alois Fürstner
- Max-Planck-Institut für Kohlenforschung, 45470 Mülheim/Ruhr, Germany.
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Kanada RM, Itoh D, Nagai M, Niijima J, Asai N, Mizui Y, Abe S, Kotake Y. Total Synthesis of the Potent Antitumor Macrolides Pladienolide B and D. Angew Chem Int Ed Engl 2007; 46:4350-5. [PMID: 17437311 DOI: 10.1002/anie.200604997] [Citation(s) in RCA: 83] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Regina M Kanada
- Discovery Research Laboratories II, Eisai Co., Ltd. 5-1-3 Tokodai, Tsukuba, Ibaraki, 300-2635, Japan
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Kanada R, Itoh D, Nagai M, Niijima J, Asai N, Mizui Y, Abe S, Kotake Y. Total Synthesis of the Potent Antitumor Macrolides Pladienolide B and D. Angew Chem Int Ed Engl 2007. [DOI: 10.1002/ange.200604997] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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Carreño MC, González-López M, Urbano A. Oxidative De-aromatization ofpara-Alkyl Phenols intopara-Peroxyquinols andpara-Quinols Mediated by Oxone as a Source of Singlet Oxygen. Angew Chem Int Ed Engl 2006. [DOI: 10.1002/ange.200504605] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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13
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Carreño MC, González-López M, Urbano A. Oxidative De-aromatization ofpara-Alkyl Phenols intopara-Peroxyquinols andpara-Quinols Mediated by Oxone as a Source of Singlet Oxygen. Angew Chem Int Ed Engl 2006; 45:2737-41. [PMID: 16548026 DOI: 10.1002/anie.200504605] [Citation(s) in RCA: 88] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- M Carmen Carreño
- Departamento de Química Orgánica, Universidad Autónoma de Madrid, Cantoblanco, 28049 Madrid, Spain.
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