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Hu L, Chakraborty S, Tumanov N, Wouters J, Robiette R, Berionni G. Regulating iminophosphorane PN bond reactivity through geometric constraints with cage-shaped triarylphosphines. Chem Commun (Camb) 2024; 60:7073-7076. [PMID: 38888188 DOI: 10.1039/d4cc01868k] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/20/2024]
Abstract
Structure-reactivity investigations and quantum-chemical parametrization of steric and electronic properties of geometrically constrained iminophosphoranes enabled the design of new frustrated Lewis pairs and revealed unusual properties at the phosphonium center embedded in the cage-shaped triptycene tricyclic scaffold.
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Affiliation(s)
- Lei Hu
- Université de Namur, Department of Chemistry, Namur Institute of Structured Matter (NISM), Rue de Bruxelles 61, Namur 5000, Belgium.
- Université Catholique de Louvain, Institute of Condensed Matter and Nanosciences, Place Louis Pasteur 1 box L4.01.02, Louvain-la-Neuve 1348, Belgium.
| | - Sayandip Chakraborty
- Université de Namur, Department of Chemistry, Namur Institute of Structured Matter (NISM), Rue de Bruxelles 61, Namur 5000, Belgium.
| | - Nikolay Tumanov
- Université de Namur, Department of Chemistry, Namur Institute of Structured Matter (NISM), Rue de Bruxelles 61, Namur 5000, Belgium.
| | - Johan Wouters
- Université de Namur, Department of Chemistry, Namur Institute of Structured Matter (NISM), Rue de Bruxelles 61, Namur 5000, Belgium.
| | - Raphaël Robiette
- Université Catholique de Louvain, Institute of Condensed Matter and Nanosciences, Place Louis Pasteur 1 box L4.01.02, Louvain-la-Neuve 1348, Belgium.
| | - Guillaume Berionni
- Université de Namur, Department of Chemistry, Namur Institute of Structured Matter (NISM), Rue de Bruxelles 61, Namur 5000, Belgium.
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2
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Bonner A, Baumann M. Development of a Continuous Flow Baldwin Rearrangement Process and Its Comparison to Traditional Batch Mode. Org Process Res Dev 2024; 28:1567-1575. [PMID: 38783852 PMCID: PMC11110046 DOI: 10.1021/acs.oprd.3c00213] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/04/2023] [Indexed: 05/25/2024]
Abstract
A new and highly efficient continuous flow process is presented for the synthesis of aziridines via the thermal Baldwin rearrangement. The process was initially explored using traditional batch synthesis techniques but suffered from moderate yields, long reaction times, and moderate diastereoselectivities. Here we demonstrate that the process can be greatly improved upon its transfer to continuous flow, which afforded the aziridine targets in high yields, short reaction times, and consistently high diastereoselectivities, with the high-throughput process rendering multigram quantities of product in short periods of time. In addition, flow processing extended the substrate scope including several examples that had failed in batch mode, thus demonstrating the value of this overlooked entry into valuable aziridine species.
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Affiliation(s)
- Arlene Bonner
- School
of Chemistry, University College Dublin, Science Centre South, Belfield, Dublin 4, Ireland D04 N2E2
| | - Marcus Baumann
- School
of Chemistry, University College Dublin, Science Centre South, Belfield, Dublin 4, Ireland D04 N2E2
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3
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Yang J, Wang C, Huang B, Zhou H, Li J, Liu X. Photoredox Catalytic Phosphine-Mediated Deoxygenative Hydroacylation of Azobenzenes with Carboxylic Acids. Org Lett 2024. [PMID: 38194307 DOI: 10.1021/acs.orglett.3c03875] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2024]
Abstract
The convenient and precise preparation of N,N'-diarylhydrazides, especially from readily available raw materials, remains highly challenging. Here, a photoredox catalytic phosphine-mediated deoxygenative hydroacylation of azobenzenes with abundant and readily available carboxylic acids has been developed. With Ir[dF(CF3)ppy]2(dtbbpy)PF6 as the photocatalyst, the reactions proceeded smoothly in the presence of PPh3 under visible light irradiation, delivering various N,N'-diarylhydrazides in up to 92% yields. Mechanistic studies revealed that the reaction proceeds via photoredox catalysis and phosphoranyl-radical-mediated C-O bond cleavage of carboxylic acids.
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Affiliation(s)
- Jingya Yang
- College of Chemistry and Chemical Engineering, Northwest Normal University, Lanzhou 730070, China
| | - Cunhui Wang
- College of Chemistry and Chemical Engineering, Northwest Normal University, Lanzhou 730070, China
| | - Bao Huang
- College of Chemistry and Chemical Engineering, Northwest Normal University, Lanzhou 730070, China
| | - Hongyan Zhou
- College of Science, Gansu Agricultural University, Lanzhou 730070, China
| | - Jiangjiang Li
- College of Science, Gansu Agricultural University, Lanzhou 730070, China
| | - Xiaojun Liu
- College of Chemistry and Chemical Engineering, Northwest Normal University, Lanzhou 730070, China
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4
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Su J, Chen A, Zhang G, Jiang Z, Zhao J. Photocatalytic Phosphine-Mediated Thioesterification of Carboxylic Acids with Disulfides. Org Lett 2023; 25:8033-8037. [PMID: 37889086 DOI: 10.1021/acs.orglett.3c03249] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2023]
Abstract
Herein, a practical and effective synthesis of thioesters from readily available carboxylic acids and odorless disulfides was developed under photocatalytic conditions. This approach involves phosphoranyl radical-mediated fragmentation to generate acyl radicals and allows for incorporation of both S atoms of the disulfides into the desired products. In addition to batch reactions, a continuous-flow reactor was employed, enabling rapid thioester synthesis on a gram scale. Preliminary experimental mechanistic studies and the rapid synthesis of dalcetrapib are also demonstrated.
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Affiliation(s)
- Junqi Su
- School of Chemistry, Dalian University of Technology, Dalian, Liaoning 116024, People's Republic of China
| | - Aobo Chen
- School of Chemistry, Dalian University of Technology, Dalian, Liaoning 116024, People's Republic of China
| | - Guofeng Zhang
- School of Chemistry, Dalian University of Technology, Dalian, Liaoning 116024, People's Republic of China
| | - Ziyu Jiang
- School of Chemistry, Dalian University of Technology, Dalian, Liaoning 116024, People's Republic of China
| | - Jiannan Zhao
- School of Chemistry, Dalian University of Technology, Dalian, Liaoning 116024, People's Republic of China
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Nie X, Ritter CW, Hemming M, Ivlev SI, Xie X, Chen S, Meggers E. Nitrene-Mediated Enantioselective Intramolecular Olefin Oxyamination to Access Chiral γ-Aminomethyl-γ-Lactones. Angew Chem Int Ed Engl 2023:e202314398. [PMID: 37920926 DOI: 10.1002/anie.202314398] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/26/2023] [Revised: 11/01/2023] [Accepted: 11/02/2023] [Indexed: 11/04/2023]
Abstract
Attaching a nitrene precursor to an intramolecular nucleophile allows for a catalytic asymmetric intramolecular oxyamination of alkenes in which the nucleophile adds in an endocyclic position and the amine in an exocyclic fashion. Using chiral-at-ruthenium catalysts, chiral γ-aminomethyl-γ-lactones containing a quaternary carbon in γ-position are provided in high yields (up to 99 %) and with excellent enantioselectivities (up to 99 % ee). DFT calculations support the possibility of both a singlet (concerted oxyamination of the alkene) and triplet pathway (stepwise oxyamination) for the formation of the predominant stereoisomer. γ-Aminomethyl-γ-lactones are versatile chiral building blocks and can be converted to other heterocycles such as δ-lactams, 2-oxazolidinones, and tetrahydrofurans.
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Affiliation(s)
- Xin Nie
- Fachbereich Chemie, Philipps-Universität Marburg, Hans-Meerwein-Straße, 35043, Marburg, Germany
| | - Clayton W Ritter
- College of Arts & Sciences, Oberlin College Science Center N381, 119 Woodland St., Oberlin, OH-44074, USA
| | - Marcel Hemming
- Fachbereich Chemie, Philipps-Universität Marburg, Hans-Meerwein-Straße, 35043, Marburg, Germany
| | - Sergei I Ivlev
- Fachbereich Chemie, Philipps-Universität Marburg, Hans-Meerwein-Straße, 35043, Marburg, Germany
| | - Xiulan Xie
- Fachbereich Chemie, Philipps-Universität Marburg, Hans-Meerwein-Straße, 35043, Marburg, Germany
| | - Shuming Chen
- College of Arts & Sciences, Oberlin College Science Center N381, 119 Woodland St., Oberlin, OH-44074, USA
| | - Eric Meggers
- Fachbereich Chemie, Philipps-Universität Marburg, Hans-Meerwein-Straße, 35043, Marburg, Germany
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Dhak MS, Arunprasath D, Argent SP, Cuthbertson JD. A Domino Radical Amidation/Semipinacol Approach to All-Carbon Quaternary Centers Bearing an Aminomethyl Group. Chemistry 2023; 29:e202300922. [PMID: 37278542 PMCID: PMC10947466 DOI: 10.1002/chem.202300922] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/23/2023] [Revised: 06/01/2023] [Accepted: 06/02/2023] [Indexed: 06/07/2023]
Abstract
A photoredox-mediated radical amidation ring-expansion sequence that enables the generation of all-carbon quaternary centers bearing a protected aminomethyl substituent is described. The methodology can be applied to both styrene and unactivated alkene substrates generating structurally diverse sp3 -rich amine derivatives in a concise manner.
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Affiliation(s)
- Mandeep S. Dhak
- GlaxoSmithKline Carbon Neutral Laboratories for Sustainable ChemistryUniversity of Nottingham, Jubilee CampusTriumph RoadNottinghamNG7 2TUUK
- School of ChemistryUniversity of NottinghamUniversity ParkNottinghamNG7 2RDUK
| | - Dhanarajan Arunprasath
- GlaxoSmithKline Carbon Neutral Laboratories for Sustainable ChemistryUniversity of Nottingham, Jubilee CampusTriumph RoadNottinghamNG7 2TUUK
- School of ChemistryUniversity of NottinghamUniversity ParkNottinghamNG7 2RDUK
| | - Stephen P. Argent
- School of ChemistryUniversity of NottinghamUniversity ParkNottinghamNG7 2RDUK
| | - James D. Cuthbertson
- GlaxoSmithKline Carbon Neutral Laboratories for Sustainable ChemistryUniversity of Nottingham, Jubilee CampusTriumph RoadNottinghamNG7 2TUUK
- School of ChemistryUniversity of NottinghamUniversity ParkNottinghamNG7 2RDUK
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