1
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Rozsar D, Farley AJM, McLauchlan I, Shennan BDA, Yamazaki K, Dixon DJ. Bifunctional Iminophosphorane-Catalyzed Enantioselective Nitroalkane Addition to Unactivated α,β-Unsaturated Esters. Angew Chem Int Ed Engl 2023; 62:e202303391. [PMID: 36929179 PMCID: PMC10946890 DOI: 10.1002/anie.202303391] [Citation(s) in RCA: 7] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/07/2023] [Revised: 03/14/2023] [Accepted: 03/15/2023] [Indexed: 03/18/2023]
Abstract
Herein we describe the enantioselective intermolecular conjugate addition of nitroalkanes to unactivated α,β-unsaturated esters, catalyzed by a bifunctional iminophosphorane (BIMP) superbase. The transformation provides the most direct access to pharmaceutically relevant enantioenriched γ-nitroesters, utilizing feedstock chemicals, with unprecedented selectivity. The methodology exhibits a broad substrate scope, including β-(fluoro)alkyl, aryl and heteroaryl substituted electrophiles, and was successfully applied on a gram scale with reduced catalyst loading, and, additionally, catalyst recovery was carried out. The formal synthesis of a range of drug molecules, and an enantioselective synthesis of (S)-rolipram were achieved. Additionally, computational studies revealed key reaction intermediates and transition state structures, and provided rationale for high enantioselectivities, in good agreement with experimental results.
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Affiliation(s)
- Daniel Rozsar
- Department of ChemistryUniversity of OxfordChemistry Research LaboratoryOX1 3TAOxfordUK
| | - Alistair J. M. Farley
- Department of ChemistryUniversity of OxfordChemistry Research LaboratoryOX1 3TAOxfordUK
| | - Iain McLauchlan
- Department of ChemistryUniversity of OxfordChemistry Research LaboratoryOX1 3TAOxfordUK
| | | | - Ken Yamazaki
- Division of Applied ChemistryOkayama University700-8530TsushimanakaOkayamaJapan
| | - Darren J. Dixon
- Department of ChemistryUniversity of OxfordChemistry Research LaboratoryOX1 3TAOxfordUK
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2
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Maruoka K. Design of Maruoka Catalysts for Asymmetric Phase-Transfer Catalysis. Tetrahedron Lett 2022. [DOI: 10.1016/j.tetlet.2022.154159] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/14/2022]
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3
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Rozsar D, Formica M, Yamazaki K, Hamlin TA, Dixon DJ. Bifunctional Iminophosphorane-Catalyzed Enantioselective Sulfa-Michael Addition to Unactivated α,β-Unsaturated Amides. J Am Chem Soc 2022; 144:1006-1015. [PMID: 34990142 PMCID: PMC8793149 DOI: 10.1021/jacs.1c11898] [Citation(s) in RCA: 14] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
![]()
The
first metal-free catalytic intermolecular enantioselective
Michael addition to unactivated α,β-unsaturated amides
is described. Consistently high enantiomeric excesses and yields were
obtained over a wide range of alkyl thiol pronucleophiles and electrophiles
under mild reaction conditions, enabled by a novel squaramide-based
bifunctional iminophosphorane catalyst. Low catalyst loadings (2.0
mol %) were achieved on a decagram scale, demonstrating the scalability
of the reaction. Computational analysis revealed the origin of the
high enantiofacial selectivity via analysis of relevant transition
structures and provided substantial support for specific noncovalent
activation of the carbonyl group of the α,β-unsaturated
amide by the catalyst.
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Affiliation(s)
- Daniel Rozsar
- Department of Chemistry, Chemistry Research Laboratory, University of Oxford, 12 Mansfield Road, OX1 3TA Oxford, United Kingdom
| | - Michele Formica
- Department of Chemistry, Chemistry Research Laboratory, University of Oxford, 12 Mansfield Road, OX1 3TA Oxford, United Kingdom
| | - Ken Yamazaki
- Department of Chemistry, Chemistry Research Laboratory, University of Oxford, 12 Mansfield Road, OX1 3TA Oxford, United Kingdom.,Department of Theoretical Chemistry, Amsterdam Institute of Molecular and Life Sciences (AIMMS), Amsterdam Center for Multiscale Modeling (ACMM), Vrije Universiteit Amsterdam, De Boelelaan 1083, 1081 HV Amsterdam, The Netherlands
| | - Trevor A Hamlin
- Department of Theoretical Chemistry, Amsterdam Institute of Molecular and Life Sciences (AIMMS), Amsterdam Center for Multiscale Modeling (ACMM), Vrije Universiteit Amsterdam, De Boelelaan 1083, 1081 HV Amsterdam, The Netherlands
| | - Darren J Dixon
- Department of Chemistry, Chemistry Research Laboratory, University of Oxford, 12 Mansfield Road, OX1 3TA Oxford, United Kingdom
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4
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Vermersch F, Yazdani S, Junor GP, Grotjahn DB, Jazzar R, Bertrand G. Stable Singlet Carbenes as Organic Superbases. Angew Chem Int Ed Engl 2021. [DOI: 10.1002/ange.202111588] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Affiliation(s)
- François Vermersch
- UCSD-CNRS Joint Research Laboratory (IRL 3555) Department of Chemistry and Biochemistry University of California San Diego, La Jolla CA 92093-0358 USA
| | - Sima Yazdani
- UCSD-CNRS Joint Research Laboratory (IRL 3555) Department of Chemistry and Biochemistry University of California San Diego, La Jolla CA 92093-0358 USA
- Department of Chemistry and Biochemistry San Diego State University 5500 Campanile Drive San Diego CA 92182-1030 USA
| | - Glen P. Junor
- UCSD-CNRS Joint Research Laboratory (IRL 3555) Department of Chemistry and Biochemistry University of California San Diego, La Jolla CA 92093-0358 USA
| | - Douglas B. Grotjahn
- Department of Chemistry and Biochemistry San Diego State University 5500 Campanile Drive San Diego CA 92182-1030 USA
| | - Rodolphe Jazzar
- UCSD-CNRS Joint Research Laboratory (IRL 3555) Department of Chemistry and Biochemistry University of California San Diego, La Jolla CA 92093-0358 USA
| | - Guy Bertrand
- UCSD-CNRS Joint Research Laboratory (IRL 3555) Department of Chemistry and Biochemistry University of California San Diego, La Jolla CA 92093-0358 USA
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5
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Vermersch F, Yazdani S, Junor GP, Grotjahn DB, Jazzar R, Bertrand G. Stable Singlet Carbenes as Organic Superbases. Angew Chem Int Ed Engl 2021; 60:27253-27257. [PMID: 34729888 DOI: 10.1002/anie.202111588] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/26/2021] [Revised: 10/18/2021] [Indexed: 11/10/2022]
Abstract
A simple experimental procedure for scaling carbene Brønsted basicity is described. The results highlight the strong basicity of pyrazol-4-ylidenes, a type of mesoionic carbene, also named cyclic-bentallenes (CBA). They are more basic (pKaH >42.7 in acetonitrile) than the popular proazaphosphatrane Verkade bases, and even the Schwesinger phosphazene superbase P4 (t Bu). The basicity of these compounds can readily be tuned, and they are accessible in multigram quantities. These results open new avenues for carbon centered superbases.
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Affiliation(s)
- François Vermersch
- UCSD-CNRS Joint Research Laboratory (IRL 3555), Department of Chemistry and Biochemistry, University of California, San Diego, La Jolla, CA, 92093-0358, USA
| | - Sima Yazdani
- UCSD-CNRS Joint Research Laboratory (IRL 3555), Department of Chemistry and Biochemistry, University of California, San Diego, La Jolla, CA, 92093-0358, USA.,Department of Chemistry and Biochemistry, San Diego State University, 5500 Campanile Drive, San Diego, CA, 92182-1030, USA
| | - Glen P Junor
- UCSD-CNRS Joint Research Laboratory (IRL 3555), Department of Chemistry and Biochemistry, University of California, San Diego, La Jolla, CA, 92093-0358, USA
| | - Douglas B Grotjahn
- Department of Chemistry and Biochemistry, San Diego State University, 5500 Campanile Drive, San Diego, CA, 92182-1030, USA
| | - Rodolphe Jazzar
- UCSD-CNRS Joint Research Laboratory (IRL 3555), Department of Chemistry and Biochemistry, University of California, San Diego, La Jolla, CA, 92093-0358, USA
| | - Guy Bertrand
- UCSD-CNRS Joint Research Laboratory (IRL 3555), Department of Chemistry and Biochemistry, University of California, San Diego, La Jolla, CA, 92093-0358, USA
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6
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Vazdar K, Margetić D, Kovačević B, Sundermeyer J, Leito I, Jahn U. Design of Novel Uncharged Organic Superbases: Merging Basicity and Functionality. Acc Chem Res 2021; 54:3108-3123. [PMID: 34308625 DOI: 10.1021/acs.accounts.1c00297] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Abstract
ConspectusOne of the constant challenges of synthetic chemistry is the molecular design and synthesis of nonionic, metal-free superbases as chemically stable neutral organic compounds of moderate molecular weight, intrinsically high thermodynamic basicity, adaptable kinetic basicity, and weak or tunable nucleophilicity at their nitrogen, phosphorus, or carbon basicity centers. Such superbases can catalyze numerous reactions, ranging from C-C bond formation to cycloadditions and polymerization, to name just a few. Additional benefits of organic superbases, as opposed to their inorganic counterparts, are their solubility in organic reaction media, mild reaction conditions, and higher selectivity. Approaching such superbasic compounds remains a continuous challenge. However, recent advances in synthetic methodology and theoretical understanding have resulted in new design principles and synthetic strategies toward superbases. Our computational contributions have demonstrated that the gas-phase basicity region of 350 kcal mol-1 and even beyond is easily reachable by organosuperbases. However, despite record-high basicities, the physical limitations of many of these compounds become quickly evident. The typically large molecular weight of these molecules and their sensitivity to ordinary reaction conditions prevent them from being practical, even though their preparation is often not too difficult. Thus, obviously structural limitations with respect to molecular weight and structural complexity must be imposed on the design of new synthetically useful organic superbases, but strategies for increasing their basicity remain important.The contemporary design of novel organic superbases is illustrated by phosphazenyl phosphanes displaying gas-phase basicities (GB) above 300 kcal mol-1 but having molecular weights well below 1000 g·mol-1. This approach is based on a reconsideration of phosphorus(III) compounds, which goes along with increasing their stability in solution. Another example is the preparation of carbodiphosphoranes incorporating pyrrolidine, tetramethylguanidine, or hexamethylphosphazene as a substituent. With gas-phase proton affinities of up to 300 kcal mol-1, they are among the top nonionic carbon bases on the basicity scale. Remarkably, the high basicity of these compounds is achieved at molecular weights of around 600 g·mol-1. Another approach to achieving high basicity through the cooperative effect of multiple intramolecular hydrogen bonding, which increases the stabilization of conjugate acids, has recently been confirmed.This Account focuses on our efforts to produce superbasic molecules that embody many desirable traits, but other groups' approaches will also be discussed. We reveal the crucial structural features of superbases and place them on known basicity scales. We discuss the emerging potential and current limits of their application and give a general outlook into the future.
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Affiliation(s)
- Katarina Vazdar
- Institute of Organic Chemistry and Biochemistry of the Czech Academy of Sciences, v.v.i. Flemingovo nám. 2, 166 10 Prague 6, Czech Republic
| | | | | | - Jörg Sundermeyer
- Fachbereich Chemie, Philipps-Universität Marburg, Hans-Meerwein-Straße, 35032 Marburg, Germany
| | - Ivo Leito
- Institute of Chemistry, University of Tartu, Ravila 14a, 50411 Tartu, Estonia
| | - Ullrich Jahn
- Institute of Organic Chemistry and Biochemistry of the Czech Academy of Sciences, v.v.i. Flemingovo nám. 2, 166 10 Prague 6, Czech Republic
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7
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Xie C, Smaligo AJ, Song XR, Kwon O. Phosphorus-Based Catalysis. ACS CENTRAL SCIENCE 2021; 7:536-558. [PMID: 34056085 PMCID: PMC8155461 DOI: 10.1021/acscentsci.0c01493] [Citation(s) in RCA: 116] [Impact Index Per Article: 38.7] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/02/2020] [Indexed: 05/08/2023]
Abstract
Phosphorus-based organocatalysis encompasses several subfields that have undergone rapid growth in recent years. This Outlook gives an overview of its various aspects. In particular, we highlight key advances in three topics: nucleophilic phosphine catalysis, organophosphorus catalysis to bypass phosphine oxide waste, and organophosphorus compound-mediated single electron transfer processes. We briefly summarize five additional topics: chiral phosphoric acid catalysis, phosphine oxide Lewis base catalysis, iminophosphorane super base catalysis, phosphonium salt phase transfer catalysis, and frustrated Lewis pair catalysis. Although it is not catalytic in nature, we also discuss novel discoveries that are emerging in phosphorus(V) ligand coupling. We conclude with some ideas about the future of organophosphorus catalysis.
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Affiliation(s)
- Changmin Xie
- Department of Chemistry and Biochemistry, University of California, Los Angeles, Los Angeles, California 90095-1569, United States
| | - Andrew J. Smaligo
- Department of Chemistry and Biochemistry, University of California, Los Angeles, Los Angeles, California 90095-1569, United States
| | | | - Ohyun Kwon
- Department of Chemistry and Biochemistry, University of California, Los Angeles, Los Angeles, California 90095-1569, United States
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8
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Formica M, Rozsar D, Su G, Farley AJM, Dixon DJ. Bifunctional Iminophosphorane Superbase Catalysis: Applications in Organic Synthesis. Acc Chem Res 2020; 53:2235-2247. [PMID: 32886474 DOI: 10.1021/acs.accounts.0c00369] [Citation(s) in RCA: 45] [Impact Index Per Article: 11.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
To improve the field of catalysis, there is a substantial and growing need for novel high-performance catalysts providing new reactivity. To date, however, the set of reactions that can be reliably performed to prepare chiral compounds in largely one enantiomeric form using chiral catalysts still represents a small fraction of the toolkit of known transformations. In this context, chiral Brønsted bases have played an expanding role in catalyzing enantioselective reactions between various carbon- and heteroatom-centered acids and a host of electrophilic reagents. This Account describes our recent efforts developing and applying a new family of chiral Brønsted bases incorporating an H-bond donor moiety and a strongly basic iminophosphorane, which we have named BIMPs (Bifunctional IMinoPhosphoranes), as efficient catalysts for reactions currently out of reach of more widespread tertiary amine centered bifunctional catalysts. The iminophosphorane Brønsted base is easily generated by the Staudinger reaction of a chiral organoazide and commercially available phosphine, which allows easy modification of the catalyst structure and fine-tuning of the iminophosphorane pKBH+. We have demonstrated that BIMP catalysts can efficiently promote the enantioselective addition of nitromethane to low reactivity N-diphenylphosphinoyl (DPP)-protected imines of ketones (ketimines) to access valuable chiral diamine and α-quaternary amino acid building blocks, and later extended this methodology to phosphite nucleophiles. Subsequently, the reaction scope was expanded to include the Michael addition of high pKa alkyl thiols to α-substituted acrylate esters, β-substituted α,β-unsaturated esters, and alkenyl benzimidazoles as well as the challenging direct aldol addition of aryl ketones to α-fluorinated ketones. Finally, BIMP catalysts were shown to be used in key steps in the synthesis of complex alkaloid natural products (-)-nakadomarin A and (-)-himalensine A, as well as in polymer synthesis. In most cases, the predictable nature of the BIMP promoted reactions was demonstrated by multigram scale-up while employing low catalyst loadings (down to 0.05 mol%). Furthermore, it was shown that BIMP catalysts can be easily immobilized onto a solid support in one-step for increased catalyst recycling and flow chemistry applications. Alongside our own work, this Account also includes elegant work by Johnson and co-workers utilizing the BIMP catalyst system, when alternative catalysts proved suboptimal.
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Affiliation(s)
- Michele Formica
- Chemistry Research Laboratory, University of Oxford, 12 Mansfield Road, OX1 3TA Oxford, United Kingdom
| | - Daniel Rozsar
- Chemistry Research Laboratory, University of Oxford, 12 Mansfield Road, OX1 3TA Oxford, United Kingdom
| | - Guanglong Su
- Chemistry Research Laboratory, University of Oxford, 12 Mansfield Road, OX1 3TA Oxford, United Kingdom
| | - Alistair J. M. Farley
- Chemistry Research Laboratory, University of Oxford, 12 Mansfield Road, OX1 3TA Oxford, United Kingdom
| | - Darren J. Dixon
- Chemistry Research Laboratory, University of Oxford, 12 Mansfield Road, OX1 3TA Oxford, United Kingdom
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9
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Wang Y, Cao Z, Li Q, Lin G, Zhou J, Tian P. Activating Pronucleophiles with High p
K
a
Values: Chiral Organo‐Superbases. Angew Chem Int Ed Engl 2020; 59:8004-8014. [DOI: 10.1002/anie.201913484] [Citation(s) in RCA: 26] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/22/2019] [Indexed: 01/02/2023]
Affiliation(s)
- Yu‐Hui Wang
- The Research Center of Chiral DrugsInnovation Research Institute of Traditional Chinese MedicineShanghai University of Traditional Chinese Medicine 1200 Cailun Road Shanghai 201203 China
| | - Zhong‐Yan Cao
- College of Chemical EngineeringZhejiang University of Technology 18 Chaowang Road Hangzhou 310014 China
| | - Qing‐Hua Li
- The Research Center of Chiral DrugsInnovation Research Institute of Traditional Chinese MedicineShanghai University of Traditional Chinese Medicine 1200 Cailun Road Shanghai 201203 China
| | - Guo‐Qiang Lin
- The Research Center of Chiral DrugsInnovation Research Institute of Traditional Chinese MedicineShanghai University of Traditional Chinese Medicine 1200 Cailun Road Shanghai 201203 China
| | - Jian Zhou
- School of Chemistry and Molecular EngineeringEast China Normal University 3663N Zhongshan Road Shanghai 200062 China
| | - Ping Tian
- The Research Center of Chiral DrugsInnovation Research Institute of Traditional Chinese MedicineShanghai University of Traditional Chinese Medicine 1200 Cailun Road Shanghai 201203 China
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10
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Wang Y, Cao Z, Li Q, Lin G, Zhou J, Tian P. Activating Pronucleophiles with High p
K
a
Values: Chiral Organo‐Superbases. Angew Chem Int Ed Engl 2020. [DOI: 10.1002/ange.201913484] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Affiliation(s)
- Yu‐Hui Wang
- The Research Center of Chiral DrugsInnovation Research Institute of Traditional Chinese MedicineShanghai University of Traditional Chinese Medicine 1200 Cailun Road Shanghai 201203 China
| | - Zhong‐Yan Cao
- College of Chemical EngineeringZhejiang University of Technology 18 Chaowang Road Hangzhou 310014 China
| | - Qing‐Hua Li
- The Research Center of Chiral DrugsInnovation Research Institute of Traditional Chinese MedicineShanghai University of Traditional Chinese Medicine 1200 Cailun Road Shanghai 201203 China
| | - Guo‐Qiang Lin
- The Research Center of Chiral DrugsInnovation Research Institute of Traditional Chinese MedicineShanghai University of Traditional Chinese Medicine 1200 Cailun Road Shanghai 201203 China
| | - Jian Zhou
- School of Chemistry and Molecular EngineeringEast China Normal University 3663N Zhongshan Road Shanghai 200062 China
| | - Ping Tian
- The Research Center of Chiral DrugsInnovation Research Institute of Traditional Chinese MedicineShanghai University of Traditional Chinese Medicine 1200 Cailun Road Shanghai 201203 China
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11
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Uraguchi D, Kawai Y, Sasaki H, Yamada K, Ooi T. Allenedicarboxylate as a Stereochemically Labile Electrophile for Chiral Organic Base-catalyzed Stereoselective Michael Addition. CHEM LETT 2018. [DOI: 10.1246/cl.180031] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Affiliation(s)
- Daisuke Uraguchi
- Institute of Transformative Bio-Molecules (WPI-ITbM) and Department of Molecular and Macromolecular Chemistry, Graduate School of Engineering, Nagoya University, Furo-cho D2-1, Chikusa, Nagoya, Aichi 464-8601, Japan
| | - Yasutaka Kawai
- Institute of Transformative Bio-Molecules (WPI-ITbM) and Department of Molecular and Macromolecular Chemistry, Graduate School of Engineering, Nagoya University, Furo-cho D2-1, Chikusa, Nagoya, Aichi 464-8601, Japan
| | - Hitoshi Sasaki
- Institute of Transformative Bio-Molecules (WPI-ITbM) and Department of Molecular and Macromolecular Chemistry, Graduate School of Engineering, Nagoya University, Furo-cho D2-1, Chikusa, Nagoya, Aichi 464-8601, Japan
| | - Kohei Yamada
- Institute of Transformative Bio-Molecules (WPI-ITbM) and Department of Molecular and Macromolecular Chemistry, Graduate School of Engineering, Nagoya University, Furo-cho D2-1, Chikusa, Nagoya, Aichi 464-8601, Japan
| | - Takashi Ooi
- Institute of Transformative Bio-Molecules (WPI-ITbM) and Department of Molecular and Macromolecular Chemistry, Graduate School of Engineering, Nagoya University, Furo-cho D2-1, Chikusa, Nagoya, Aichi 464-8601, Japan
- CREST, Japan Science and Technology Agency (JST), Nagoya University, Nagoya, Aichi 464-8601, Japan
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12
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Uraguchi D, Shibazaki R, Tanaka N, Yamada K, Yoshioka K, Ooi T. Catalyst-Enabled Site-Divergent Stereoselective Michael Reactions: Overriding Intrinsic Reactivity of Enynyl Carbonyl Acceptors. Angew Chem Int Ed Engl 2018. [DOI: 10.1002/ange.201800057] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Affiliation(s)
- Daisuke Uraguchi
- Institute of Transformative Bio-Molecules (WPI-ITbM) and Department of Molecular and Macromolecular Chemistry; Graduate School of Engineering; Nagoya University; Nagoya 464-8601 Japan
| | - Ryo Shibazaki
- Institute of Transformative Bio-Molecules (WPI-ITbM) and Department of Molecular and Macromolecular Chemistry; Graduate School of Engineering; Nagoya University; Nagoya 464-8601 Japan
| | - Naoya Tanaka
- Institute of Transformative Bio-Molecules (WPI-ITbM) and Department of Molecular and Macromolecular Chemistry; Graduate School of Engineering; Nagoya University; Nagoya 464-8601 Japan
| | - Kohei Yamada
- Institute of Transformative Bio-Molecules (WPI-ITbM) and Department of Molecular and Macromolecular Chemistry; Graduate School of Engineering; Nagoya University; Nagoya 464-8601 Japan
| | - Ken Yoshioka
- Institute of Transformative Bio-Molecules (WPI-ITbM) and Department of Molecular and Macromolecular Chemistry; Graduate School of Engineering; Nagoya University; Nagoya 464-8601 Japan
| | - Takashi Ooi
- Institute of Transformative Bio-Molecules (WPI-ITbM) and Department of Molecular and Macromolecular Chemistry; Graduate School of Engineering; Nagoya University; Nagoya 464-8601 Japan
- CREST, Japan Science and Technology Agency (JST); Nagoya University; Nagoya 464-8601 Japan
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13
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Uraguchi D, Shibazaki R, Tanaka N, Yamada K, Yoshioka K, Ooi T. Catalyst-Enabled Site-Divergent Stereoselective Michael Reactions: Overriding Intrinsic Reactivity of Enynyl Carbonyl Acceptors. Angew Chem Int Ed Engl 2018; 57:4732-4736. [DOI: 10.1002/anie.201800057] [Citation(s) in RCA: 42] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/04/2018] [Indexed: 12/14/2022]
Affiliation(s)
- Daisuke Uraguchi
- Institute of Transformative Bio-Molecules (WPI-ITbM) and Department of Molecular and Macromolecular Chemistry; Graduate School of Engineering; Nagoya University; Nagoya 464-8601 Japan
| | - Ryo Shibazaki
- Institute of Transformative Bio-Molecules (WPI-ITbM) and Department of Molecular and Macromolecular Chemistry; Graduate School of Engineering; Nagoya University; Nagoya 464-8601 Japan
| | - Naoya Tanaka
- Institute of Transformative Bio-Molecules (WPI-ITbM) and Department of Molecular and Macromolecular Chemistry; Graduate School of Engineering; Nagoya University; Nagoya 464-8601 Japan
| | - Kohei Yamada
- Institute of Transformative Bio-Molecules (WPI-ITbM) and Department of Molecular and Macromolecular Chemistry; Graduate School of Engineering; Nagoya University; Nagoya 464-8601 Japan
| | - Ken Yoshioka
- Institute of Transformative Bio-Molecules (WPI-ITbM) and Department of Molecular and Macromolecular Chemistry; Graduate School of Engineering; Nagoya University; Nagoya 464-8601 Japan
| | - Takashi Ooi
- Institute of Transformative Bio-Molecules (WPI-ITbM) and Department of Molecular and Macromolecular Chemistry; Graduate School of Engineering; Nagoya University; Nagoya 464-8601 Japan
- CREST, Japan Science and Technology Agency (JST); Nagoya University; Nagoya 464-8601 Japan
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14
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Uraguchi D, Yamada K, Sato M, Ooi T. Catalyst-Directed Guidance of Sulfur-Substituted Enediolates to Stereoselective Carbon–Carbon Bond Formation with Aldehydes. J Am Chem Soc 2018; 140:5110-5117. [DOI: 10.1021/jacs.7b12949] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Daisuke Uraguchi
- Institute of Transformative Bio-Molecules (WPI-ITbM) and Department of Molecular and Macromolecular Chemistry, Graduate School of Engineering, Nagoya University, Nagoya 464-8601, Japan
| | - Kohei Yamada
- Institute of Transformative Bio-Molecules (WPI-ITbM) and Department of Molecular and Macromolecular Chemistry, Graduate School of Engineering, Nagoya University, Nagoya 464-8601, Japan
| | - Makoto Sato
- CREST, Japan Science and Technology Agency (JST), Nagoya University, Nagoya 464-8601, Japan
| | - Takashi Ooi
- Institute of Transformative Bio-Molecules (WPI-ITbM) and Department of Molecular and Macromolecular Chemistry, Graduate School of Engineering, Nagoya University, Nagoya 464-8601, Japan
- CREST, Japan Science and Technology Agency (JST), Nagoya University, Nagoya 464-8601, Japan
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15
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Uraguchi D, Sasaki H, Kimura Y, Ito T, Ooi T. Molecular Design, Synthesis, and Asymmetric Catalysis of a Hexacoordinated Chiral Phosphate Ion. J Am Chem Soc 2018; 140:2765-2768. [DOI: 10.1021/jacs.7b13433] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Daisuke Uraguchi
- Institute
of Transformative Bio-Molecules (WPI-ITbM) and Department of Molecular
and Macromolecular Chemistry, Graduate School of Engineering, Nagoya University, Nagoya 464-8601, Japan
| | - Hitoshi Sasaki
- Institute
of Transformative Bio-Molecules (WPI-ITbM) and Department of Molecular
and Macromolecular Chemistry, Graduate School of Engineering, Nagoya University, Nagoya 464-8601, Japan
| | - Yuto Kimura
- Institute
of Transformative Bio-Molecules (WPI-ITbM) and Department of Molecular
and Macromolecular Chemistry, Graduate School of Engineering, Nagoya University, Nagoya 464-8601, Japan
| | - Takaki Ito
- Institute
of Transformative Bio-Molecules (WPI-ITbM) and Department of Molecular
and Macromolecular Chemistry, Graduate School of Engineering, Nagoya University, Nagoya 464-8601, Japan
| | - Takashi Ooi
- Institute
of Transformative Bio-Molecules (WPI-ITbM) and Department of Molecular
and Macromolecular Chemistry, Graduate School of Engineering, Nagoya University, Nagoya 464-8601, Japan
- CREST,
Japan Science and Technology Agency (JST), Nagoya University, Nagoya 464-8601, Japan
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16
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Uraguchi D, Ito T, Kimura Y, Nobori Y, Sato M, Ooi T. [5.5]-P-Spirocyclic Chiral Triaminoiminophosphorane-Catalyzed Asymmetric Hydrophosphonylation of Aldehydes and Ynones. BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN 2017. [DOI: 10.1246/bcsj.20170040] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Affiliation(s)
- Daisuke Uraguchi
- Institute of Transformative Bio-Molecules (WPI-ITbM) and Department of Applied Chemistry, Graduate School of Engineering, Nagoya University, Nagoya, Aichi 464-8601
| | - Takaki Ito
- Institute of Transformative Bio-Molecules (WPI-ITbM) and Department of Applied Chemistry, Graduate School of Engineering, Nagoya University, Nagoya, Aichi 464-8601
| | - Yuto Kimura
- Institute of Transformative Bio-Molecules (WPI-ITbM) and Department of Applied Chemistry, Graduate School of Engineering, Nagoya University, Nagoya, Aichi 464-8601
| | - Yumiko Nobori
- Institute of Transformative Bio-Molecules (WPI-ITbM) and Department of Applied Chemistry, Graduate School of Engineering, Nagoya University, Nagoya, Aichi 464-8601
| | - Makoto Sato
- Institute of Transformative Bio-Molecules (WPI-ITbM) and Department of Applied Chemistry, Graduate School of Engineering, Nagoya University, Nagoya, Aichi 464-8601
- CREST, Japan Science and Technology Agency (JST), Nagoya University, Nagoya, Aichi 464-8601
| | - Takashi Ooi
- Institute of Transformative Bio-Molecules (WPI-ITbM) and Department of Applied Chemistry, Graduate School of Engineering, Nagoya University, Nagoya, Aichi 464-8601
- CREST, Japan Science and Technology Agency (JST), Nagoya University, Nagoya, Aichi 464-8601
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17
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Tanaka N, Tsutsumi R, Uraguchi D, Ooi T. N-Sulfonyl α-imino ester-derived chiral oxaziridines: catalytic asymmetric synthesis and application as a modular chiral organic oxidant. Chem Commun (Camb) 2017; 53:6999-7002. [DOI: 10.1039/c7cc02502e] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A novel class of chiral N-sulfonyl oxaziridines is catalytically prepared and introduced for use as highly reactive and enantiospecific oxidants.
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Affiliation(s)
- Naoya Tanaka
- Institute of Transformative Bio-Molecules (WPI-ITbM) and Department of Molecular and Macromolecular Chemistry
- Graduate School of Engineering
- Nagoya University
- Chikusa
- Japan
| | - Ryosuke Tsutsumi
- Institute of Transformative Bio-Molecules (WPI-ITbM) and Department of Molecular and Macromolecular Chemistry
- Graduate School of Engineering
- Nagoya University
- Chikusa
- Japan
| | - Daisuke Uraguchi
- Institute of Transformative Bio-Molecules (WPI-ITbM) and Department of Molecular and Macromolecular Chemistry
- Graduate School of Engineering
- Nagoya University
- Chikusa
- Japan
| | - Takashi Ooi
- Institute of Transformative Bio-Molecules (WPI-ITbM) and Department of Molecular and Macromolecular Chemistry
- Graduate School of Engineering
- Nagoya University
- Chikusa
- Japan
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18
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Yoshioka K, Yamada K, Uraguchi D, Ooi T. Unique site-selectivity control in asymmetric Michael addition of azlactone to alkenyl dienyl ketones enabled by P-spiro chiral iminophosphorane catalysis. Chem Commun (Camb) 2017; 53:5495-5498. [DOI: 10.1039/c7cc01715d] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Simultaneous recognition of distance and direction of conjugation from carbonyl in alkenyl dienyl ketones enables a highly site-selective asymmetric 1,6-addition.
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Affiliation(s)
- Ken Yoshioka
- Institute of Transformative Bio-Molecules (WPI-ITbM) and Department of Applied Chemistry
- Graduate School of Engineering
- Nagoya University
- Japan
| | - Kohei Yamada
- Institute of Transformative Bio-Molecules (WPI-ITbM) and Department of Applied Chemistry
- Graduate School of Engineering
- Nagoya University
- Japan
| | - Daisuke Uraguchi
- Institute of Transformative Bio-Molecules (WPI-ITbM) and Department of Applied Chemistry
- Graduate School of Engineering
- Nagoya University
- Japan
| | - Takashi Ooi
- Institute of Transformative Bio-Molecules (WPI-ITbM) and Department of Applied Chemistry
- Graduate School of Engineering
- Nagoya University
- Japan
- CREST
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19
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Yamanaka M, Sakata K, Yoshioka K, Uraguchi D, Ooi T. Origin of High Regio-, Diastereo-, and Enantioselectivities in 1,6-Addition of Azlactones to Dienyl N-Acylpyrroles: A Computational Study. J Org Chem 2016; 82:541-548. [DOI: 10.1021/acs.joc.6b02572] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Affiliation(s)
- Masahiro Yamanaka
- Department
of Chemistry and Research Center for Smart Molecules, Faculty of Science, Rikkyo University, 3-34-1 Nishi-Ikebukuro, Toshima-ku, Tokyo 171-8501, Japan
| | - Ken Sakata
- Faculty
of Pharmaceutical Sciences, Hoshi University, Ebara, Shinagawa-ku, Tokyo 142-8501, Japan
| | - Ken Yoshioka
- Institute
of Transformative Bio-Molecules (WPI-ITbM) and Department of Applied
Chemistry, Graduate School of Engineering, Nagoya University, Nagoya 464-8602, Japan
| | - Daisuke Uraguchi
- Institute
of Transformative Bio-Molecules (WPI-ITbM) and Department of Applied
Chemistry, Graduate School of Engineering, Nagoya University, Nagoya 464-8602, Japan
| | - Takashi Ooi
- Institute
of Transformative Bio-Molecules (WPI-ITbM) and Department of Applied
Chemistry, Graduate School of Engineering, Nagoya University, Nagoya 464-8602, Japan
- CREST,
Japan Science and Technology Agency (JST), Nagoya University, Nagoya 464-8602, Japan
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20
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Kizu T, Uraguchi D, Ooi T. Independence from the Sequence of Single-Electron Transfer of Photoredox Process in Redox-Neutral Asymmetric Bond-Forming Reaction. J Org Chem 2016; 81:6953-8. [DOI: 10.1021/acs.joc.6b00445] [Citation(s) in RCA: 56] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Affiliation(s)
- Tomohito Kizu
- Department
of Applied Chemistry, Graduate School of Engineering, Nagoya University, Nagoya 464-8602, Japan
| | - Daisuke Uraguchi
- Department
of Applied Chemistry, Graduate School of Engineering, Nagoya University, Nagoya 464-8602, Japan
| | - Takashi Ooi
- Institute of Transformative Bio-Molecules (WPI-ITbM), and Department of Applied Chemistry, Graduate School of Engineering, Nagoya University, and CREST, Japan Science and Technology Agency (JST), Nagoya 464-8602, Japan
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21
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Horwitz MA, Tanaka N, Yokosaka T, Uraguchi D, Johnson JS, Ooi T. Enantioselective reductive multicomponent coupling reactions between isatins and aldehydes. Chem Sci 2015; 6:6086-6090. [PMID: 26508995 PMCID: PMC4618493 DOI: 10.1039/c5sc02170g] [Citation(s) in RCA: 59] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/16/2015] [Accepted: 07/23/2015] [Indexed: 12/24/2022] Open
Abstract
A metal-free stereoselective reductive coupling reaction between isatins and aldehydes is reported. The reaction relies on commercial diethyl phosphite (∼€70 kg-1) as the stoichiometric reductant. Base-catalyzed Pudovik addition and phosphonate/phosphate rearrangement achieved polarity inversion on the isatin, and the derived carbanions were trapped by aldehydes with subsequent dialkoxyphosphinyl migration. Chiral iminophosphoranes were used as basic catalysts to achieve high diastereo- and enantioselectivities with excellent yields.
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Affiliation(s)
- Matthew A. Horwitz
- Department of Chemistry
, The University of North Carolina at Chapel Hill
,
Chapel Hill
, NC 27599
, USA
.
| | - Naoya Tanaka
- Institute of Transformative Bio-Molecules (WPI-ITbM) and Department of Applied Chemistry
, Graduate School of Engineering
, Nagoya University
,
Furo-cho D2-1, Chikusa
, Nagoya 464-8602
, Japan
.
| | - Takuya Yokosaka
- Department of Chemistry
, The University of North Carolina at Chapel Hill
,
Chapel Hill
, NC 27599
, USA
.
| | - Daisuke Uraguchi
- Institute of Transformative Bio-Molecules (WPI-ITbM) and Department of Applied Chemistry
, Graduate School of Engineering
, Nagoya University
,
Furo-cho D2-1, Chikusa
, Nagoya 464-8602
, Japan
.
| | - Jeffrey S. Johnson
- Department of Chemistry
, The University of North Carolina at Chapel Hill
,
Chapel Hill
, NC 27599
, USA
.
| | - Takashi Ooi
- Institute of Transformative Bio-Molecules (WPI-ITbM) and Department of Applied Chemistry
, Graduate School of Engineering
, Nagoya University
,
Furo-cho D2-1, Chikusa
, Nagoya 464-8602
, Japan
.
- CREST
, Japan Science and Technology Agency (JST)
, Nagoya University
,
Nagoya 464-8603
, Japan
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22
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Kondoh A, Oishi M, Takeda T, Terada M. Enantioselective Addition of a 2‐Alkoxycarbonyl‐1,3‐dithiane to Imines Catalyzed by a Bis(guanidino)iminophosphorane Organosuperbase. Angew Chem Int Ed Engl 2015; 54:15836-9. [DOI: 10.1002/anie.201508178] [Citation(s) in RCA: 48] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/01/2015] [Indexed: 11/11/2022]
Affiliation(s)
- Azusa Kondoh
- Research and Analytical Center for Giant Molecules, Graduate School of Science, Tohoku University, Aramaki, Aoba‐ku, Sendai 980‐8578 (Japan)
| | - Masafumi Oishi
- Department of Chemistry, Graduate School of Science, Tohoku University, Aramaki, Aoba‐ku, Sendai 980‐8578 (Japan)
| | - Tadahiro Takeda
- Process Technology Research Laboratories, Daiichi Sankyo Co., Ltd, Edogawa‐ku, Tokyo 134‐8630 (Japan)
| | - Masahiro Terada
- Research and Analytical Center for Giant Molecules, Graduate School of Science, Tohoku University, Aramaki, Aoba‐ku, Sendai 980‐8578 (Japan)
- Department of Chemistry, Graduate School of Science, Tohoku University, Aramaki, Aoba‐ku, Sendai 980‐8578 (Japan)
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23
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Kondoh A, Oishi M, Takeda T, Terada M. Enantioselective Addition of a 2‐Alkoxycarbonyl‐1,3‐dithiane to Imines Catalyzed by a Bis(guanidino)iminophosphorane Organosuperbase. Angew Chem Int Ed Engl 2015. [DOI: 10.1002/ange.201508178] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Azusa Kondoh
- Research and Analytical Center for Giant Molecules, Graduate School of Science, Tohoku University, Aramaki, Aoba‐ku, Sendai 980‐8578 (Japan)
| | - Masafumi Oishi
- Department of Chemistry, Graduate School of Science, Tohoku University, Aramaki, Aoba‐ku, Sendai 980‐8578 (Japan)
| | - Tadahiro Takeda
- Process Technology Research Laboratories, Daiichi Sankyo Co., Ltd, Edogawa‐ku, Tokyo 134‐8630 (Japan)
| | - Masahiro Terada
- Research and Analytical Center for Giant Molecules, Graduate School of Science, Tohoku University, Aramaki, Aoba‐ku, Sendai 980‐8578 (Japan)
- Department of Chemistry, Graduate School of Science, Tohoku University, Aramaki, Aoba‐ku, Sendai 980‐8578 (Japan)
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24
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Uraguchi D, Kinoshita N, Kizu T, Ooi T. Synergistic Catalysis of Ionic Brønsted Acid and Photosensitizer for a Redox Neutral Asymmetric α-Coupling of N-Arylaminomethanes with Aldimines. J Am Chem Soc 2015; 137:13768-71. [DOI: 10.1021/jacs.5b09329] [Citation(s) in RCA: 254] [Impact Index Per Article: 28.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Affiliation(s)
- Daisuke Uraguchi
- Institute of Transformative Bio-Molecules (WPI-ITbM)
and Department of Applied Chemistry, Graduate School of Engineering and ‡CREST, Japan Science
and Technology Agency (JST), Nagoya University, Nagoya 464-8602, Japan
| | - Natsuko Kinoshita
- Institute of Transformative Bio-Molecules (WPI-ITbM)
and Department of Applied Chemistry, Graduate School of Engineering and ‡CREST, Japan Science
and Technology Agency (JST), Nagoya University, Nagoya 464-8602, Japan
| | - Tomohito Kizu
- Institute of Transformative Bio-Molecules (WPI-ITbM)
and Department of Applied Chemistry, Graduate School of Engineering and ‡CREST, Japan Science
and Technology Agency (JST), Nagoya University, Nagoya 464-8602, Japan
| | - Takashi Ooi
- Institute of Transformative Bio-Molecules (WPI-ITbM)
and Department of Applied Chemistry, Graduate School of Engineering and ‡CREST, Japan Science
and Technology Agency (JST), Nagoya University, Nagoya 464-8602, Japan
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25
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Nacsa ED, Lambert TH. Higher-Order Cyclopropenimine Superbases: Direct Neutral Brønsted Base Catalyzed Michael Reactions with α-Aryl Esters. J Am Chem Soc 2015; 137:10246-53. [PMID: 26131761 PMCID: PMC4617652 DOI: 10.1021/jacs.5b05033] [Citation(s) in RCA: 52] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The synthesis and characterization of six new classes of higher-order superbases, including five that incorporate cyclopropenimine functionality, has been achieved. We propose a nomenclature that designates these as the CG2, GC2, PC3, PC1, C3, and GP2 classes of superbases. The pK(BH+) values were measured to be between 29.0 and 35.6 in acetonitrile. Linear correlations of ten superbase basicities vs that of their substituents demonstrated the insulating effect of the cyclopropenimine core. The molecular structures of several of these materials were obtained by single-crystal X-ray analysis, revealing interesting aspects of conformational bias and noncovalent organization. The types of superbasic cores and substituents were each reliably shown to affect selectivity for deprotonation over alkylation. Higher-order cyclopropenimine and guanidine superbase stability to hydrolysis was found to correlate to basicity. Finally, a GC2 base was found to catalyze conjugate additions of α-aryl ester pronucleophiles, representing the first report of a neutral Brønsted base to catalyze such reactions.
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Affiliation(s)
- Eric D Nacsa
- Department of Chemistry, Columbia University, New York, New York 10027, United States
| | - Tristan H Lambert
- Department of Chemistry, Columbia University, New York, New York 10027, United States
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26
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Uraguchi D, Yamada K, Ooi T. HighlyE-Selective and Enantioselective Michael Addition to Electron-Deficient Internal Alkynes Under Chiral Iminophosphorane Catalysis. Angew Chem Int Ed Engl 2015. [DOI: 10.1002/ange.201503928] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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27
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Uraguchi D, Yamada K, Ooi T. Highly
E
‐Selective and Enantioselective Michael Addition to Electron‐Deficient Internal Alkynes Under Chiral Iminophosphorane Catalysis. Angew Chem Int Ed Engl 2015; 54:9954-7. [DOI: 10.1002/anie.201503928] [Citation(s) in RCA: 54] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/29/2015] [Indexed: 11/12/2022]
Affiliation(s)
- Daisuke Uraguchi
- Institute of Transformative Bio‐Molecules (WPI‐ITbM) and Department of Applied Chemistry, Graduate School of Engineering, Nagoya University, Nagoya 464‐8603 (Japan)
| | - Kohei Yamada
- Institute of Transformative Bio‐Molecules (WPI‐ITbM) and Department of Applied Chemistry, Graduate School of Engineering, Nagoya University, Nagoya 464‐8603 (Japan)
| | - Takashi Ooi
- Institute of Transformative Bio‐Molecules (WPI‐ITbM) and Department of Applied Chemistry, Graduate School of Engineering, Nagoya University, Nagoya 464‐8603 (Japan)
- CREST, Japan Science and Technology Agency (JST), Nagoya University, Nagoya 464‐8603 (Japan)
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28
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Terada M, Goto K, Ikehara T, Kondoh A. Synthesis of Intermediary P3 Phosphazenium Framework and Its Derivatization to Chiral Cationic Macrocycles Including Two P3 Phosphazenium Units with Hydrogen Bond Donor Sites. HETEROCYCLES 2015. [DOI: 10.3987/com-14-s(k)98] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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29
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Uraguchi D, Tsutsumi R, Ooi T. Catalytic asymmetric Payne oxidation under the catalysis of P-spiro chiral triaminoiminophosphorane: application to the synthesis of N-sulfonyl oxaziridines. Tetrahedron 2014. [DOI: 10.1016/j.tet.2013.12.086] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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30
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Uraguchi D, Nakamura S, Sasaki H, Konakade Y, Ooi T. Enantioselective formal α-allylation of nitroalkanes through a chiral iminophosphorane-catalyzed Michael reaction–Julia–Kocienski olefination sequence. Chem Commun (Camb) 2014; 50:3491-3. [DOI: 10.1039/c3cc49477b] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
A chiral iminophosphorane-catalyzed Michael addition–Julia–Kocienski olefination sequence for the asymmetric formal α-allylation of nitroalkanes is developed.
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Affiliation(s)
- Daisuke Uraguchi
- Institute of Transformative Bio-Molecules (WPI-ITbM) and Department of Applied Chemistry
- Graduate School of Engineering
- Nagoya University
- Nagoya 464-8603, Japan
| | - Shinji Nakamura
- Institute of Transformative Bio-Molecules (WPI-ITbM) and Department of Applied Chemistry
- Graduate School of Engineering
- Nagoya University
- Nagoya 464-8603, Japan
| | - Hitoshi Sasaki
- Institute of Transformative Bio-Molecules (WPI-ITbM) and Department of Applied Chemistry
- Graduate School of Engineering
- Nagoya University
- Nagoya 464-8603, Japan
| | - Yuki Konakade
- Institute of Transformative Bio-Molecules (WPI-ITbM) and Department of Applied Chemistry
- Graduate School of Engineering
- Nagoya University
- Nagoya 464-8603, Japan
| | - Takashi Ooi
- Institute of Transformative Bio-Molecules (WPI-ITbM) and Department of Applied Chemistry
- Graduate School of Engineering
- Nagoya University
- Nagoya 464-8603, Japan
- CREST
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31
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Takeda T, Terada M. Development of a Chiral Bis(guanidino)iminophosphorane as an Uncharged Organosuperbase for the Enantioselective Amination of Ketones. J Am Chem Soc 2013; 135:15306-9. [DOI: 10.1021/ja408296h] [Citation(s) in RCA: 109] [Impact Index Per Article: 9.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Tadahiro Takeda
- Process
Technology Research Laboratories, Daiichi Sankyo Co., Ltd., Edogawa-ku, Tokyo 134-8630, Japan
| | - Masahiro Terada
- Department
of Chemistry and Research and Analytical Center for Giant Molecules,
Graduate School of Science, Tohoku University, Aoba-ku, Sendai 980-8578, Japan
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32
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Ammer J, Nolte C, Karaghiosoff K, Thallmair S, Mayer P, de Vivie-Riedle R, Mayr H. Ion-pairing of phosphonium salts in solution: C-H⋅⋅⋅halogen and C-H⋅⋅⋅π hydrogen bonds. Chemistry 2013; 19:14612-30. [PMID: 24014323 DOI: 10.1002/chem.201204561] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2012] [Revised: 06/06/2013] [Indexed: 12/15/2022]
Abstract
The (1) H NMR chemical shifts of the C(α)H protons of arylmethyl triphenylphosphonium ions in CD2 Cl2 solution strongly depend on the counteranions X(-) . The values for the benzhydryl derivatives Ph2 CHPPh3 (+) X(-) , for example, range from δH =8.25 (X(-) =Cl(-) ) over 6.23 (X(-) =BF4 (-) ) to 5.72 ppm (X(-) =BPh4 (-) ). Similar, albeit weaker, counterion-induced shifts are observed for the ortho-protons of all aryl groups. Concentration-dependent NMR studies show that the large shifts result from the deshielding of the protons by the anions, which decreases in the order Cl(-) > Br(-) ≫ BF4 (-) > SbF6 (-) . For the less bulky derivatives PhCH2 PPh3 (+) X(-) , we also find CH⋅⋅⋅Ph interactions between C(α)H and a phenyl group of the BPh4 (-) anion, which result in upfield NMR chemical shifts of the C(α)H protons. These interactions could also be observed in crystals of (p-CF3 -C6 H4 )CH2 PPh3 (+) BPh4 (-) . However, the dominant effects causing the counterion-induced shifts in the NMR spectra are the CH⋅⋅⋅X(-) hydrogen bonds between the phosphonium ion and anions, in particular Cl(-) or Br(-) . This observation contradicts earlier interpretations which assigned these shifts predominantly to the ring current of the BPh4 (-) anions. The concentration dependence of the (1) H NMR chemical shifts allowed us to determine the dissociation constants of the phosphonium salts in CD2 Cl2 solution. The cation-anion interactions increase with the acidity of the C(α)H protons and the basicity of the anion. The existence of CH⋅⋅⋅X(-) hydrogen bonds between the cations and anions is confirmed by quantum chemical calculations of the ion pair structures, as well as by X-ray analyses of the crystals. The IR spectra of the Cl(-) and Br(-) salts in CD2 Cl2 solution show strong red-shifts of the CH stretch bands. The CH stretch bands of the tetrafluoroborate salt PhCH2 PPh3 (+) BF4 (-) in CD2 Cl2 , however, show a blue-shift compared to the corresponding BPh4 (-) salt.
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Affiliation(s)
- Johannes Ammer
- Ludwig-Maximilians-Universität München, Butenandtstrasse 5-13, 81377 München (Germany), Fax: (+49) 89-2180-77398.
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33
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Uraguchi D, Tsutsumi R, Ooi T. Catalytic asymmetric oxidation of N-sulfonyl imines with hydrogen peroxide-trichloroacetonitrile system. J Am Chem Soc 2013; 135:8161-4. [PMID: 23679016 DOI: 10.1021/ja403491j] [Citation(s) in RCA: 44] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
An efficient and highly enantioselective Payne-type oxidation of N-sulfonyl imines is developed. The reaction exhibits broad substrate generality and unique chemoselectivity based on the combined use of hydrogen peroxide and trichloroacetonitrile under the catalysis of P-spiro chiral triaminoiminophosphorane.
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Affiliation(s)
- Daisuke Uraguchi
- Institute of Transformative Bio-Molecules (WPI-ITbM), Nagoya University , Nagoya 464-8602, Japan
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34
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Uraguchi D, Ueki Y, Sugiyama A, Ooi T. Highly stereoselective Michael addition of azlactones to electron-deficient triple bonds under P-spiro chiral iminophosphorane catalysis: importance of protonation pathway. Chem Sci 2013. [DOI: 10.1039/c2sc22027j] [Citation(s) in RCA: 74] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
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35
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Uraguchi D, Yoshioka K, Ueki Y, Ooi T. Highly Regio-, Diastereo-, and Enantioselective 1,6- and 1,8-Additions of Azlactones to Di- and Trienyl N-Acylpyrroles. J Am Chem Soc 2012; 134:19370-3. [DOI: 10.1021/ja310209g] [Citation(s) in RCA: 142] [Impact Index Per Article: 11.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Daisuke Uraguchi
- Department of Applied Chemistry, Graduate School of
Engineering, Nagoya University, Nagoya
464-8603, Japan
| | - Ken Yoshioka
- Department of Applied Chemistry, Graduate School of
Engineering, Nagoya University, Nagoya
464-8603, Japan
| | - Yusuke Ueki
- Department of Applied Chemistry, Graduate School of
Engineering, Nagoya University, Nagoya
464-8603, Japan
| | - Takashi Ooi
- Department of Applied Chemistry, Graduate School of
Engineering, Nagoya University, Nagoya
464-8603, Japan
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