101
|
Trigo-López M, Vallejos S, Reglero Ruiz JA, García-Gómez A, Seara-Martínez M, García FC, García JM. High-performance nanoporous aramid films reinforced with functionalized carbon nanocharges using ionic liquids. POLYMER 2020. [DOI: 10.1016/j.polymer.2020.122629] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
|
102
|
Tamboli AB, Kalshetti BS, Ghodke SD, Diwate AV, Maldar NN. Synthesis and characterization of semi-aromatic polyamides containing heterocyclic 1,3,5 s-triazine and methylene spacer group for thermally stable and colloidal property. Des Monomers Polym 2020; 23:93-105. [PMID: 33029078 PMCID: PMC7473130 DOI: 10.1080/15685551.2020.1795435] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022] Open
Abstract
A new aromatic diacid (II) was synthesized and Characterized by Spectroscopic techniques namely, FT-IR, 1 H and 13 C NMR, etc. A series of aromatic aliphatic polyamides containing phenoxy s-triazine ring with methylene spacer group was synthesized from diacid (II) and various aromatic diamines by using Yamazaki Phosphorylation method. These polyamides were obtained in good yields and characterized by solubility in common organic solvent, inherent viscosity, FT-IR, X-ray diffraction analysis. All of these polyamides were found to be amorphous in morphology as indicated by XRD to posses outstanding solubilities, and to be easily dissolved in amide-type polar aprotic polar solvents. Polyamides with moderate inherent viscosity in the range 0.21 to 0.41 dL/g in N,N,dimethyl formamide solvent (DMF) at 30 ± 0.1° C. The Thermal properties of the polyamides were evaluated by Thermogravimetric analysis and Differential scanning calorimetery. These polymer shows good thermal stability with glass transition temperature (Tg) of 143-223°C and their (Tmax) weight loss temperature were around 426-455°C, confirming their good thermal stability. The char yields of these polymers were given their limiting oxygen index LOI 32.3 to 37.5 5% values of polyamides; indicate these polymers also show good flame resistance. The NPs were negatively charged with a zeta potential of -24.2 to -37.9 mV indicating a good colloidal stability against aggregation.
Collapse
Affiliation(s)
- A B Tamboli
- Chemistry Department, Santosh Bhimrao Patil Arts, Commerce and Science College, Solapur, India
| | - B S Kalshetti
- Chemistry Department, Santosh Bhimrao Patil Arts, Commerce and Science College, Solapur, India
| | - S D Ghodke
- Chemistry Department, Santosh Bhimrao Patil Arts, Commerce and Science College, Solapur, India
| | - A V Diwate
- Chemistry Department, Santosh Bhimrao Patil Arts, Commerce and Science College, Solapur, India
| | - N N Maldar
- Chemistry Department, Santosh Bhimrao Patil Arts, Commerce and Science College, Solapur, India
| |
Collapse
|
103
|
Gao P, Szostak M. Highly Selective and Divergent Acyl and Aryl Cross-Couplings of Amides via Ir-Catalyzed C–H Borylation/N–C(O) Activation. Org Lett 2020; 22:6010-6015. [DOI: 10.1021/acs.orglett.0c02105] [Citation(s) in RCA: 18] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Affiliation(s)
- Pengcheng Gao
- Department of Chemistry, Rutgers University, 73 Warren Street, Newark, New Jersey 07102, United States
| | - Michal Szostak
- Department of Chemistry, Rutgers University, 73 Warren Street, Newark, New Jersey 07102, United States
| |
Collapse
|
104
|
Marset D, Dolza C, Boronat T, Montanes N, Balart R, Sanchez-Nacher L, Quiles-Carrillo L. Injection-Molded Parts of Partially Biobased Polyamide 610 and Biobased Halloysite Nanotubes. Polymers (Basel) 2020; 12:E1503. [PMID: 32640632 PMCID: PMC7407294 DOI: 10.3390/polym12071503] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/11/2020] [Revised: 07/03/2020] [Accepted: 07/04/2020] [Indexed: 11/17/2022] Open
Abstract
This works focuses on the development of environmentally friendly composites with a partially biobased polyamide 610 (PA610), containing 63% biobased content, and a natural inorganic filler at the nanoscale, namely, halloysite nanotubes (HNTs). PA610 composites containing 10, 20, and 30 wt% HNTs were obtained by melt extrusion in a twin screw co-rotating extruder. The resulting composites were injection-molded for further characterization. The obtained materials were characterized to obtain reliable data about their mechanical, thermal, and morphological properties. The effect of the HNTs wt% on these properties was evaluated. From a mechanical standpoint, the addition of 30 wt% HNTs gave an increase in tensile modulus of twice the initial value, thus verifying how this type of natural load provides increased stiffness on injection molded parts. The materials prepared with HNTs slightly improved the thermal stability, while a noticeable improvement on thermomechanical resistance over a wide temperature range was observed with increasing HNTs content. The obtained results indicate that high biobased content composites can be obtained with an engineering thermoplastic, i.e., PA610, and a natural inorganic nanotube-shaped filler, i.e., HNTs, with balanced mechanical properties and attractive behavior against high temperature.
Collapse
Affiliation(s)
- David Marset
- Textile Industry Research Association (AITEX), Plaza Emilio Sala, 1, 03801 Alcoy, Spain; (D.M.); (C.D.)
| | - Celia Dolza
- Textile Industry Research Association (AITEX), Plaza Emilio Sala, 1, 03801 Alcoy, Spain; (D.M.); (C.D.)
| | - Teodomiro Boronat
- Technological Institute of Materials (ITM), Universitat Politècnica de València (UPV), Plaza Ferrándiz y Carbonell 1, 03801 Alcoy, Spain; (T.B.); (N.M.); (R.B.); (L.S.-N.)
| | - Nestor Montanes
- Technological Institute of Materials (ITM), Universitat Politècnica de València (UPV), Plaza Ferrándiz y Carbonell 1, 03801 Alcoy, Spain; (T.B.); (N.M.); (R.B.); (L.S.-N.)
| | - Rafael Balart
- Technological Institute of Materials (ITM), Universitat Politècnica de València (UPV), Plaza Ferrándiz y Carbonell 1, 03801 Alcoy, Spain; (T.B.); (N.M.); (R.B.); (L.S.-N.)
| | - Lourdes Sanchez-Nacher
- Technological Institute of Materials (ITM), Universitat Politècnica de València (UPV), Plaza Ferrándiz y Carbonell 1, 03801 Alcoy, Spain; (T.B.); (N.M.); (R.B.); (L.S.-N.)
| | - Luis Quiles-Carrillo
- Technological Institute of Materials (ITM), Universitat Politècnica de València (UPV), Plaza Ferrándiz y Carbonell 1, 03801 Alcoy, Spain; (T.B.); (N.M.); (R.B.); (L.S.-N.)
| |
Collapse
|
105
|
Aegurla B, Mandle RD, Shinde PG, Parit RS, Kamble SP, Sudalai A, Senthilkumar B. Triethyl Phosphite/Benzoyl Peroxide Mediated Reductive Dealkylation of
O
‐Benzoylhydroxylamines: A Cascade Synthesis of Secondary Amides. European J Org Chem 2020. [DOI: 10.1002/ejoc.202000611] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Balakrishna Aegurla
- Chemical Engineering & Process Development Division CSIR‐National Chemical Laboratory Dr. Homi Bhabha Road ‐ 411008 Pune Maharashtra India
| | - Ram D. Mandle
- Chemical Engineering & Process Development Division CSIR‐National Chemical Laboratory Dr. Homi Bhabha Road ‐ 411008 Pune Maharashtra India
| | - Prasad G. Shinde
- Organic Chemistry Division CSIR‐National Chemical Laboratory Dr. Homi Bhabha Road ‐ 411008 Pune Maharashtra India
| | - Ratan S. Parit
- Organic Chemistry Division CSIR‐National Chemical Laboratory Dr. Homi Bhabha Road ‐ 411008 Pune Maharashtra India
| | - Sanjay P. Kamble
- Chemical Engineering & Process Development Division CSIR‐National Chemical Laboratory Dr. Homi Bhabha Road ‐ 411008 Pune Maharashtra India
| | - Arumugam Sudalai
- Chemical Engineering & Process Development Division CSIR‐National Chemical Laboratory Dr. Homi Bhabha Road ‐ 411008 Pune Maharashtra India
| | - Beeran Senthilkumar
- Organic Chemistry Division CSIR‐National Chemical Laboratory Dr. Homi Bhabha Road ‐ 411008 Pune Maharashtra India
| |
Collapse
|
106
|
Ma N, Liu W, Ma L, He S, Liu H, Zhang Z, Sun A, Huang M, Zhu C. Crystal transition and thermal behavior of Nylon 12. E-POLYMERS 2020. [DOI: 10.1515/epoly-2020-0039] [Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
AbstractThe polyamide 12 (PA12) with different crystal forms is prepared with three crystallization paths. The crystal structures and corresponding thermal properties are systematically investigated. The results reveal that an α-form and a mixed (α + γ)-form of PA12 can be obtained by casting at 30°C and (40–80°C), respectively. Meanwhile, the γ-form of PA12 can be obtained by both casting at 90°C and slow melt cooling. However, the γ′-form is obtained only by melt quenching. Both the γ and γ′ forms of PA12 exhibit a single melting peak, whereas the α-form exhibits two melting peaks. The higher peak is attributed to the melting of γ-PA12, which originates from the melting–recrystallization of the α-PA12. It is found that the tensile properties of PA12 depend on the crystal forms. Both the γ and γ′-PA12 are strong and tough polymer materials, while α-PA12 is a strong but brittle polymer material.
Collapse
Affiliation(s)
- Ning Ma
- School of Materials Science and Engineering, Zhengzhou University, No. 100 Science Avenue, Zhengzhou, Henan, 450001, P. R. China
| | - Wentao Liu
- School of Materials Science and Engineering, Zhengzhou University, No. 100 Science Avenue, Zhengzhou, Henan, 450001, P. R. China
| | - Lili Ma
- School of Materials Science and Engineering, Zhengzhou University, No. 100 Science Avenue, Zhengzhou, Henan, 450001, P. R. China
| | - Suqin He
- School of Materials Science and Engineering, Zhengzhou University, No. 100 Science Avenue, Zhengzhou, Henan, 450001, P. R. China
- Henan Key Laboratory of Advanced Nylon Materials and Application (Zhengzhou University), No. 100 Science Avenue, Zhengzhou, Henan, 450001, P. R. China
| | - Hao Liu
- School of Materials Science and Engineering, Zhengzhou University, No. 100 Science Avenue, Zhengzhou, Henan, 450001, P. R. China
| | - Zhenya Zhang
- Isotope Institute Co., Ltd., Henan Academy of Sciences, Zhengzhou 450015, China
| | - Aihua Sun
- Key Laboratory of Additive Manufacturing Material of Zhejiang Province, Department of Functional Materials and Nano-Devices, Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, 1219 Zhongguan West Road, Ningbo 315201, China
| | - Miaoming Huang
- School of Materials Science and Engineering, Zhengzhou University, No. 100 Science Avenue, Zhengzhou, Henan, 450001, P. R. China
| | - Chengshen Zhu
- School of Materials Science and Engineering, Zhengzhou University, No. 100 Science Avenue, Zhengzhou, Henan, 450001, P. R. China
| |
Collapse
|
107
|
Robust NHC-palladacycles-catalyzed Suzuki−Miyaura cross-coupling of amides via C-N activation. GREEN SYNTHESIS AND CATALYSIS 2020. [DOI: 10.1016/j.gresc.2020.06.001] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022] Open
|
108
|
Buchspies J, Rahman MM, Szostak R, Szostak M. N-Acylcarbazoles and N-Acylindoles: Electronically Activated Amides for N–C(O) Cross-Coupling by Nlp to Ar Conjugation Switch. Org Lett 2020; 22:4703-4709. [DOI: 10.1021/acs.orglett.0c01488] [Citation(s) in RCA: 20] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Affiliation(s)
- Jonathan Buchspies
- Department of Chemistry, Rutgers University, 73 Warren Street, Newark, New Jersey 07102, United States
| | - Md. Mahbubur Rahman
- Department of Chemistry, Rutgers University, 73 Warren Street, Newark, New Jersey 07102, United States
| | - Roman Szostak
- Department of Chemistry, Wroclaw University, F. Joliot-Curie 14, Wroclaw 50-383, Poland
| | - Michal Szostak
- Department of Chemistry, Rutgers University, 73 Warren Street, Newark, New Jersey 07102, United States
| |
Collapse
|
109
|
Winnacker M, Lamparelli DH, Capacchione C, Güngör HH, Stieglitz L, Rodewald KS, Schmidt M, Gronauer TF. Sustainable Polyesteramides and Copolyamides: Insights into the Copolymerization Behavior of Terpene‐Based Lactams. MACROMOL CHEM PHYS 2020. [DOI: 10.1002/macp.202000110] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Affiliation(s)
- Malte Winnacker
- WACKER‐Chair of Macromolecular ChemistryTechnical University of MunichLichtenbergstraße 4, Garching bei München and Catalysis Research Center (CRC) Ernst‐Otto‐Fischer‐Straße 1 Garching bei München 85748 Germany
| | - David H. Lamparelli
- Dipartimento di Chimica e Biologia “A. Zambelli”Universitá degli Studi di Salerno via Giovanni Paolo II Fisciano SA 132 I‐84084 Italy
| | - Carmine Capacchione
- Dipartimento di Chimica e Biologia “A. Zambelli”Universitá degli Studi di Salerno via Giovanni Paolo II Fisciano SA 132 I‐84084 Italy
| | - Hicran H. Güngör
- WACKER‐Chair of Macromolecular ChemistryTechnical University of MunichLichtenbergstraße 4, Garching bei München and Catalysis Research Center (CRC) Ernst‐Otto‐Fischer‐Straße 1 Garching bei München 85748 Germany
| | - Lucas Stieglitz
- WACKER‐Chair of Macromolecular ChemistryTechnical University of MunichLichtenbergstraße 4, Garching bei München and Catalysis Research Center (CRC) Ernst‐Otto‐Fischer‐Straße 1 Garching bei München 85748 Germany
| | - Katia S. Rodewald
- WACKER‐Chair of Macromolecular ChemistryTechnical University of MunichLichtenbergstraße 4, Garching bei München and Catalysis Research Center (CRC) Ernst‐Otto‐Fischer‐Straße 1 Garching bei München 85748 Germany
| | - Matthias Schmidt
- WACKER‐Chair of Macromolecular ChemistryTechnical University of MunichLichtenbergstraße 4, Garching bei München and Catalysis Research Center (CRC) Ernst‐Otto‐Fischer‐Straße 1 Garching bei München 85748 Germany
| | - Thomas F. Gronauer
- Chair of Organic Chemistry IITechnische Universität München Lichtenbergstraße 4 Garching bei München 85748 Germany
| |
Collapse
|
110
|
Wang CA, Liu C, Szostak M. N-Acyl-5,5-Dimethylhydantoins: Mild Acyl-Transfer Reagents for the Synthesis of Ketones Using Pd–PEPPSI or Pd/Phosphine Catalysts. Org Process Res Dev 2020. [DOI: 10.1021/acs.oprd.0c00054] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Affiliation(s)
- Chang-An Wang
- College of Chemistry and Chemical Engineering, Taishan University, Tai’an, Shandong 271000, China
- Department of Chemistry, Rutgers University, 73 Warren Street, Newark, New Jersey 07102, United States
| | - Chengwei Liu
- Department of Chemistry, Rutgers University, 73 Warren Street, Newark, New Jersey 07102, United States
| | - Michal Szostak
- Department of Chemistry, Rutgers University, 73 Warren Street, Newark, New Jersey 07102, United States
| |
Collapse
|
111
|
Rahman MM, Liu C, Bisz E, Dziuk B, Lalancette R, Wang Q, Chen H, Szostak R, Szostak M. N-Acyl-glutarimides: Effect of Glutarimide Ring on the Structures of Fully Perpendicular Twisted Amides and N–C Bond Cross-Coupling. J Org Chem 2020; 85:5475-5485. [DOI: 10.1021/acs.joc.0c00227] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Affiliation(s)
- Md. Mahbubur Rahman
- Department of Chemistry, Rutgers University, 73 Warren Street, Newark, New Jersey 07102, United States
| | - Chengwei Liu
- Department of Chemistry, Rutgers University, 73 Warren Street, Newark, New Jersey 07102, United States
| | - Elwira Bisz
- Department of Chemistry, Opole University, 48 Oleska Street, Opole 45-052, Poland
| | - Błażej Dziuk
- Department of Chemistry, Opole University, 48 Oleska Street, Opole 45-052, Poland
- Faculty of Chemistry, Wrocław University of Science and Technology, Wybrzeże Wyspiańskiego 27, 50-373 Wrocław, Poland
| | - Roger Lalancette
- Department of Chemistry, Rutgers University, 73 Warren Street, Newark, New Jersey 07102, United States
| | - Qi Wang
- Department of Chemistry & Environmental Science, New Jersey Institute of Technology, Newark, New Jersey 07102, United States
| | - Hao Chen
- Department of Chemistry & Environmental Science, New Jersey Institute of Technology, Newark, New Jersey 07102, United States
| | - Roman Szostak
- Department of Chemistry, Wroclaw University, F. Joliot-Curie 14, Wroclaw 50-383, Poland
| | - Michal Szostak
- Department of Chemistry, Rutgers University, 73 Warren Street, Newark, New Jersey 07102, United States
| |
Collapse
|
112
|
Long Y, Su Z, Zheng Y, He S, Zhong J, Xiang H, Zhou X. Rhodium-Catalyzed Transarylation of Benzamides: C–C Bond vs C–N Bond Activation. ACS Catal 2020. [DOI: 10.1021/acscatal.9b05214] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Affiliation(s)
- Yang Long
- College of Chemistry, Sichuan University, 29 Wangjiang Road, Chengdu 610064, P. R. China
| | - Zhishan Su
- College of Chemistry, Sichuan University, 29 Wangjiang Road, Chengdu 610064, P. R. China
| | - Yanling Zheng
- College of Chemistry, Sichuan University, 29 Wangjiang Road, Chengdu 610064, P. R. China
| | - Shiyu He
- College of Chemistry, Sichuan University, 29 Wangjiang Road, Chengdu 610064, P. R. China
| | - Jing Zhong
- College of Chemistry, Sichuan University, 29 Wangjiang Road, Chengdu 610064, P. R. China
| | - Haifeng Xiang
- College of Chemistry, Sichuan University, 29 Wangjiang Road, Chengdu 610064, P. R. China
| | - Xiangge Zhou
- College of Chemistry, Sichuan University, 29 Wangjiang Road, Chengdu 610064, P. R. China
| |
Collapse
|
113
|
Xu J, Gao Y, Li Z, Liu J, Guo T, Zhang L, Wang H, Zhang Z, Guo K. Chlorotropylium Promoted Conversions of Oximes to Amides and Nitriles. European J Org Chem 2020. [DOI: 10.1002/ejoc.201901537] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Jiaxi Xu
- State Key Laboratory of Materials-Oriented Chemical Engineering; College of Biotechnology and Pharmaceutical Engineering; Nanjing Tech University; 30 Puzhu Road South 211816 Nanjing China
| | - Yu Gao
- State Key Laboratory of Materials-Oriented Chemical Engineering; College of Biotechnology and Pharmaceutical Engineering; Nanjing Tech University; 30 Puzhu Road South 211816 Nanjing China
| | - Zhenjiang Li
- State Key Laboratory of Materials-Oriented Chemical Engineering; College of Biotechnology and Pharmaceutical Engineering; Nanjing Tech University; 30 Puzhu Road South 211816 Nanjing China
| | - Jingjing Liu
- State Key Laboratory of Materials-Oriented Chemical Engineering; College of Biotechnology and Pharmaceutical Engineering; Nanjing Tech University; 30 Puzhu Road South 211816 Nanjing China
| | - Tianfo Guo
- State Key Laboratory of Materials-Oriented Chemical Engineering; College of Biotechnology and Pharmaceutical Engineering; Nanjing Tech University; 30 Puzhu Road South 211816 Nanjing China
| | - Lei Zhang
- State Key Laboratory of Materials-Oriented Chemical Engineering; College of Biotechnology and Pharmaceutical Engineering; Nanjing Tech University; 30 Puzhu Road South 211816 Nanjing China
| | - Haixin Wang
- State Key Laboratory of Materials-Oriented Chemical Engineering; College of Biotechnology and Pharmaceutical Engineering; Nanjing Tech University; 30 Puzhu Road South 211816 Nanjing China
| | - Zhihao Zhang
- State Key Laboratory of Materials-Oriented Chemical Engineering; College of Biotechnology and Pharmaceutical Engineering; Nanjing Tech University; 30 Puzhu Road South 211816 Nanjing China
| | - Kai Guo
- State Key Laboratory of Materials-Oriented Chemical Engineering; College of Biotechnology and Pharmaceutical Engineering; Nanjing Tech University; 30 Puzhu Road South 211816 Nanjing China
| |
Collapse
|
114
|
Li G, Zhou T, Poater A, Cavallo L, Nolan SP, Szostak M. Buchwald–Hartwig cross-coupling of amides (transamidation) by selective N–C(O) cleavage mediated by air- and moisture-stable [Pd(NHC)(allyl)Cl] precatalysts: catalyst evaluation and mechanism. Catal Sci Technol 2020. [DOI: 10.1039/c9cy02080b] [Citation(s) in RCA: 44] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
We report a combined experimental and computational study of the Buchwald–Hartwig cross-coupling of amides by N–C(O) cleavage (transamidation) using well-defined, air- and moisture-stable [Pd(NHC)(allyl)Cl] precatalysts.
Collapse
Affiliation(s)
- Guangchen Li
- Department of Chemistry
- Rutgers University
- Newark
- USA
| | | | - Albert Poater
- Institut de Química Computacional i Catàlisi and Departament de Química
- Universitat de Girona
- 17003 Girona
- Spain
| | - Luigi Cavallo
- King Abdullah University of Science & Technology
- KAUST Catalysis Center (KCC)
- 23955-6900 Thuwal
- Saudi Arabia
| | | | | |
Collapse
|
115
|
Abstract
Double C–N bond cleavage of amides and tertiary amines afforded the transamidated products in good yields.
Collapse
Affiliation(s)
- Muhammad Aliyu Idris
- Department of Chemistry
- Chonnam National University
- Gwangju 61186
- Republic of Korea
| | - Sunwoo Lee
- Department of Chemistry
- Chonnam National University
- Gwangju 61186
- Republic of Korea
| |
Collapse
|
116
|
Hayes GC, Becer CR. Levulinic acid: a sustainable platform chemical for novel polymer architectures. Polym Chem 2020. [DOI: 10.1039/d0py00705f] [Citation(s) in RCA: 46] [Impact Index Per Article: 11.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
Levulinic acid is a multipurpose platform chemical that is currently used in a wide variety of applications.
Collapse
|
117
|
Yang D, Shin T, Kim H, Lee S. Nickel/briphos-catalyzed transamidation of unactivated tertiary amides. Org Biomol Chem 2020; 18:6053-6057. [DOI: 10.1039/d0ob01271h] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
The transamidation of tertiary amides was achieved via nickel catalysis in combination with briphos ligands.
Collapse
Affiliation(s)
- Dahyeon Yang
- Department of Chemistry
- Chonnam National University
- Gwangju 61186
- Republic of Korea
| | - Taeil Shin
- Department of Chemistry
- Daejeon 34141
- Republic of Korea
| | - Hyunwoo Kim
- Department of Chemistry
- Daejeon 34141
- Republic of Korea
| | - Sunwoo Lee
- Department of Chemistry
- Chonnam National University
- Gwangju 61186
- Republic of Korea
| |
Collapse
|
118
|
Nguyen THN, Balligand F, Bormann A, Bennevault V, Guégan P. Synthesis of new biobased linear poly(ester amide)s. Eur Polym J 2019. [DOI: 10.1016/j.eurpolymj.2019.109314] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
|
119
|
Zhou T, Ji CL, Hong X, Szostak M. Palladium-catalyzed decarbonylative Suzuki-Miyaura cross-coupling of amides by carbon-nitrogen bond activation. Chem Sci 2019; 10:9865-9871. [PMID: 32015810 PMCID: PMC6977462 DOI: 10.1039/c9sc03169c] [Citation(s) in RCA: 53] [Impact Index Per Article: 10.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/27/2019] [Accepted: 08/31/2019] [Indexed: 12/12/2022] Open
Abstract
Palladium-catalyzed Suzuki-Miyaura cross-coupling or aryl halides is widely employed in the synthesis of many important molecules in synthetic chemistry, including pharmaceuticals, polymers and functional materials. Herein, we disclose the first palladium-catalyzed decarbonylative Suzuki-Miyaura cross-coupling of amides for the synthesis of biaryls through the selective activation of the N-C(O) bond of amides. This new method relies on the precise sequence engineering of the catalytic cycle, wherein decarbonylation occurs prior to the transmetallation step. The reaction is compatible with a wide range of boronic acids and amides, providing valuable biaryls in high yields (>60 examples). DFT studies support a mechanism involving oxidative addition, decarbonylation and transmetallation and provide insight into high N-C(O) bond activation selectivity. Most crucially, the reaction establishes the use of palladium catalysis in the biaryl Suzuki-Miyaura cross-coupling of the amide bond and should enable the design of a wide variety of cross-coupling methods in which palladium rivals the traditional biaryl synthesis from aryl halides and pseudohalides.
Collapse
Affiliation(s)
- Tongliang Zhou
- Department of Chemistry , Rutgers University , 73 Warren Street , Newark , NJ 07102 , USA .
| | - Chong-Lei Ji
- Department of Chemistry , Zhejiang University , Hangzhou 310027 , China .
| | - Xin Hong
- Department of Chemistry , Zhejiang University , Hangzhou 310027 , China .
| | - Michal Szostak
- College of Chemistry and Chemical Engineering , Key Laboratory of Auxiliary Chemistry and Technology for Chemical Industry , Ministry of Education, Shaanxi University of Science and Technology , Xi'an 710021 , China
- Department of Chemistry , Rutgers University , 73 Warren Street , Newark , NJ 07102 , USA .
| |
Collapse
|
120
|
Lei P, Ling Y, An J, Nolan SP, Szostak M. 2‐Methyltetrahydrofuran (2‐MeTHF): A Green Solvent for Pd−NHC‐Catalyzed Amide and Ester Suzuki‐Miyaura Cross‐Coupling by N−C/O−C Cleavage. Adv Synth Catal 2019. [DOI: 10.1002/adsc.201901188] [Citation(s) in RCA: 28] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Affiliation(s)
- Peng Lei
- College of Plant ProtectionNorthwest A&F University, Yangling Shaanxi 712100 China
- Department of Applied Chemistry, College of ScienceChina Agricultural University Beijing 100193 China
- Department of ChemistryRutgers University 73 Warren Street Newark NJ 07102 United States
| | - Yun Ling
- Department of Applied Chemistry, College of ScienceChina Agricultural University Beijing 100193 China
| | - Jie An
- Department of Applied Chemistry, College of ScienceChina Agricultural University Beijing 100193 China
| | - Steven P. Nolan
- Department of Chemistry and Center for Sustainable ChemistryGhent University Krijgslaan 281 9000 Ghent Belgium
| | - Michal Szostak
- Department of ChemistryRutgers University 73 Warren Street Newark NJ 07102 United States
| |
Collapse
|
121
|
Rahman MM, Li G, Szostak M. Metal-Free Transamidation of Secondary Amides by N–C Cleavage. J Org Chem 2019; 84:12091-12100. [DOI: 10.1021/acs.joc.9b02013] [Citation(s) in RCA: 47] [Impact Index Per Article: 9.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Md. Mahbubur Rahman
- Department of Chemistry, Rutgers University, 73 Warren Street, Newark, New Jersey 07102, United States
| | - Guangchen Li
- Department of Chemistry, Rutgers University, 73 Warren Street, Newark, New Jersey 07102, United States
| | - Michal Szostak
- Department of Chemistry, Rutgers University, 73 Warren Street, Newark, New Jersey 07102, United States
| |
Collapse
|
122
|
Ye D, Liu Z, Chen H, Sessler JL, Lei C. Cesium Carbonate Catalyzed Esterification of N-Benzyl- N-Boc-amides under Ambient Conditions. Org Lett 2019; 21:6888-6892. [PMID: 31407912 DOI: 10.1021/acs.orglett.9b02513] [Citation(s) in RCA: 25] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
We report a general activated amide to ester transformation catalyzed by Cs2CO3. Using this approach, esterification proceeds under relatively mild conditions and without the need for a transition metal catalyst. This method exhibits broad substrate scope and represents a practical alternative to existing esterification strategies. The synthetic utility of this protocol is demonstrated via the facile synthesis of crown ether derivatives and the late-stage modification of a representative natural product and several sugars in reasonable yields.
Collapse
Affiliation(s)
- Danfeng Ye
- School of Materials Science and Engineering, Shanghai University, Shanghai 200444, China.,Center for Supramolecular Chemistry & Catalysis and Department of Chemistry, College of Sciences, Shanghai University, Shanghai 200444, China
| | - Zhiyuan Liu
- Center for Supramolecular Chemistry & Catalysis and Department of Chemistry, College of Sciences, Shanghai University, Shanghai 200444, China
| | - Hao Chen
- Center for Supramolecular Chemistry & Catalysis and Department of Chemistry, College of Sciences, Shanghai University, Shanghai 200444, China
| | - Jonathan L Sessler
- Center for Supramolecular Chemistry & Catalysis and Department of Chemistry, College of Sciences, Shanghai University, Shanghai 200444, China.,Department of Chemistry, the University of Texas at Austin, Austin, Texas 78712-1224, United States
| | - Chuanhu Lei
- Center for Supramolecular Chemistry & Catalysis and Department of Chemistry, College of Sciences, Shanghai University, Shanghai 200444, China
| |
Collapse
|
123
|
Yue B, Ye P, Liu B, Chang Z. Fabrication and characterization of a large medical balloon with ultra-high strength. Technol Health Care 2019; 27:129-135. [PMID: 30664516 DOI: 10.3233/thc-181539] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
Abstract
BACKGROUND Transcatheter aortic valve implantation (TAVI) has emerged as a promising treatment strategy for patients with severe symptomatic aortic stenosis (AS). Moreover, characteristics of Chinese patients that are different from those of patients in Western countries, such as a high prevalence of bicuspid aortic valve (BAV), severe calcification, and a small peripheral artery diameter, have been observed. OBJECTIVE A novel large medical balloon with ultra-high strength was fabricated through the blending modification of PA12/TR55. METHODS The mechanical properties, particularly puncture resistance, of large balloons were thoroughly studied, and TR55, a modified nylon pellet with good mechanical properties and excellent compatibility with PA12, was applied to modify PA12. RESULTS Compared with pure PA12, the fabricated PA12/TR55 balloon exhibited a higher bursting pressure, lower compliance, and higher punctures resistance while retaining good processability and excellent biocompatibility. The improved mechanical properties can be attributed to an increase in crystallinity and densification. CONCLUSIONS The PA12/TR55 balloon is suitable for Chinese patients with bicuspid aortic valve and severe calcification and therefore has potential for clinical application in transcatheter aortic valve implantation. Moreover, this blending modification provides a simple but efficient method of solving other problems in cardiac angioplasty or cryoablation in which mechanical reinforcement of balloons may be necessary.
Collapse
|
124
|
Mourgas G, Giebel E, Bauch V, Schneck T, Unold J, Buchmeiser MR. Synthesis of intrinsically flame‐retardant copolyamides and their employment in PA6‐fibers. POLYM ADVAN TECHNOL 2019. [DOI: 10.1002/pat.4720] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Georgios Mourgas
- German Institutes of Textile and Fiber Research Körschtalstr 26, D‐73770 Denkendorf Germany
| | - Elisabeth Giebel
- German Institutes of Textile and Fiber Research Körschtalstr 26, D‐73770 Denkendorf Germany
| | - Volker Bauch
- German Institutes of Textile and Fiber Research Körschtalstr 26, D‐73770 Denkendorf Germany
| | - Tanja Schneck
- German Institutes of Textile and Fiber Research Körschtalstr 26, D‐73770 Denkendorf Germany
- Institute of Polymer ChemistryUniversity of Stuttgart Pfaffenwaldring 55 D‐70569 Stuttgart Germany
| | - Joerg Unold
- German Institutes of Textile and Fiber Research Körschtalstr 26, D‐73770 Denkendorf Germany
| | - Michael R. Buchmeiser
- German Institutes of Textile and Fiber Research Körschtalstr 26, D‐73770 Denkendorf Germany
- Institute of Polymer ChemistryUniversity of Stuttgart Pfaffenwaldring 55 D‐70569 Stuttgart Germany
| |
Collapse
|
125
|
Li G, Ji CL, Hong X, Szostak M. Highly Chemoselective, Transition-Metal-Free Transamidation of Unactivated Amides and Direct Amidation of Alkyl Esters by N-C/O-C Cleavage. J Am Chem Soc 2019; 141:11161-11172. [PMID: 31203613 DOI: 10.1021/jacs.9b04136] [Citation(s) in RCA: 139] [Impact Index Per Article: 27.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
The amide bond is one of the most fundamental functional groups in chemistry and biology and plays a central role in numerous processes harnessed to streamline the synthesis of key pharmaceutical and industrial molecules. Although the synthesis of amides is one of the most frequently performed reactions by academic and industrial scientists, the direct transamidation of tertiary amides is challenging due to unfavorable kinetic and thermodynamic contributions of the process. Herein, we report the first general, mild, and highly chemoselective method for transamidation of unactivated tertiary amides by a direct acyl N-C bond cleavage with non-nucleophilic amines. This operationally simple method is performed in the absence of transition metals and operates under unusually mild reaction conditions. In this context, we further describe the direct amidation of abundant alkyl esters to afford amide bonds with exquisite selectivity by acyl C-O bond cleavage. The utility of this process is showcased by a broad scope of the method, including various sensitive functional groups, late-stage modification, and the synthesis of drug molecules (>80 examples). Remarkable selectivity toward different functional groups and within different amide and ester electrophiles that is not feasible using existing methods was observed. Extensive experimental and computational studies were conducted to provide insight into the mechanism and the origins of high selectivity. We further present a series of guidelines to predict the reactivity of amides and esters in the synthesis of valuable amide bonds by this user-friendly process. In light of the importance of the amide bond in organic synthesis and major practical advantages of this method, the study opens up new opportunities in the synthesis of pivotal amide bonds in a broad range of chemical contexts.
Collapse
Affiliation(s)
- Guangchen Li
- Department of Chemistry , Rutgers University , 73 Warren Street , Newark , New Jersey 07102 , United States
| | - Chong-Lei Ji
- Department of Chemistry , Zhejiang University , Hangzhou 310027 , China
| | - Xin Hong
- Department of Chemistry , Zhejiang University , Hangzhou 310027 , China
| | - Michal Szostak
- College of Chemistry and Chemical Engineering and Key Laboratory of Auxiliary Chemistry and Technology for Chemical Industry, Ministry of Education , Shaanxi University of Science and Technology , Xi'an 710021 , China.,Department of Chemistry , Rutgers University , 73 Warren Street , Newark , New Jersey 07102 , United States
| |
Collapse
|
126
|
Bhattacharjee J, Harinath A, Sarkar A, Panda TK. Polymerization of ϵ‐Caprolactam to Nylon‐6 Catalyzed by Barium σ‐Borane Complex under Mild Condition. ChemCatChem 2019. [DOI: 10.1002/cctc.201900920] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Jayeeta Bhattacharjee
- Department of ChemistryIndian Institute of Technology Hyderabad Kandi- 502 285, Sangareddy, Telangana India
| | - Adimulam Harinath
- Department of ChemistryIndian Institute of Technology Hyderabad Kandi- 502 285, Sangareddy, Telangana India
| | - Alok Sarkar
- Momentive Performance Materials Pvt. Ltd. Survey No. 09 Hosur Road, Electronic City (West) Bangalore- 560100 India
| | - Tarun K. Panda
- Department of ChemistryIndian Institute of Technology Hyderabad Kandi- 502 285, Sangareddy, Telangana India
| |
Collapse
|
127
|
Tee H, Koynov K, Reichel T, Wurm FR. Noncovalent Hydrogen Bonds Tune the Mechanical Properties of Phosphoester Polyethylene Mimics. ACS OMEGA 2019; 4:9324-9332. [PMID: 31172047 PMCID: PMC6545546 DOI: 10.1021/acsomega.9b01040] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 04/11/2019] [Accepted: 05/16/2019] [Indexed: 06/09/2023]
Abstract
Polyethylene mimics of semicrystalline polyphosphoesters (PPEs) with an adjustable amount of noncovalent cross-links were synthesized. Acyclic diene metathesis copolymerization of a phosphoric acid triester (M1) with a novel phosphoric acid diester monomer (M2) was achieved. PPEs with different co-monomer ratios and 0, 20, 40, and 100% of phosphodiester content were synthesized. The phosphodiester groups result in supramolecular interactions between the polymer chains, with the P-OH functionality as an H-bond donor and the P=O group as an H-bond acceptor. A library of unsaturated and saturated PPEs was prepared and analyzed in detail by NMR spectroscopy, size exclusion chromatography, differential scanning calorimetry, thermogravimetry, rheology, and stress-strain measurements. The introduction of the supramolecular cross-links into the aliphatic and hydrophobic PPEs showed a significant impact on the material properties: increased glass-transition and melting temperatures were observed and an increase in the storage modulus of the polymers was achieved. This specific combination of a flexible aliphatic backbone and a supramolecular H-bonding interaction between the chains was maximized in the homopolymer of the phosphodiester monomer, which featured additional properties, such as shape-memory properties, and polymer samples could be healed after cutting. The P-OH groups also showed a strong adhesion toward metal surfaces, which was used together with the shape-memory function in a model device that responds to a temperature stimulus with shape change. This systematic variation of phosphodiesters/phosphotriesters in polyethylene mimics further underlines the versatility of the phosphorus chemistry to build up complex macromolecular architectures.
Collapse
Affiliation(s)
- Hisaschi
T. Tee
- Max-Planck-Institut
für Polymerforschung, Ackermannweg 10, 55128 Mainz, Germany
| | - Kaloian Koynov
- Max-Planck-Institut
für Polymerforschung, Ackermannweg 10, 55128 Mainz, Germany
| | - Tobias Reichel
- Heraeus
Medical, Philipp-Reis-Straße 8/13, 61273 Wehrheim, Germany
| | - Frederik R. Wurm
- Max-Planck-Institut
für Polymerforschung, Ackermannweg 10, 55128 Mainz, Germany
| |
Collapse
|
128
|
Yu S, Ho Song K, Lee S. Metal‐Free Transamidation of Primary Amides using Trimethylsilyl Chloride. ASIAN J ORG CHEM 2019. [DOI: 10.1002/ajoc.201900216] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Affiliation(s)
- Subeen Yu
- Department of ChemistryChonnam National University Gwangju 61186 Republic of Korea
| | - Kwang Ho Song
- Department of Chemical & Biological EngineeringKorea University Seoul 02841 Republic of Korea
| | - Sunwoo Lee
- Department of ChemistryChonnam National University Gwangju 61186 Republic of Korea
| |
Collapse
|
129
|
Zhou T, Li G, Nolan SP, Szostak M. [Pd(NHC)(acac)Cl]: Well-Defined, Air-Stable, and Readily Available Precatalysts for Suzuki and Buchwald-Hartwig Cross-coupling (Transamidation) of Amides and Esters by N-C/O-C Activation. Org Lett 2019; 21:3304-3309. [PMID: 30990697 DOI: 10.1021/acs.orglett.9b01053] [Citation(s) in RCA: 73] [Impact Index Per Article: 14.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
A general class of well-defined, air-stable, and readily available Pd(II)-NHC precatalysts (NHC = N-heterocyclic carbene) for Suzuki and Buchwald-Hartwig cross-coupling of amides (transamidation) and esters by selective N-C/O-C cleavage is reported. Since these precatalysts are highly active and the easiest to synthesize, the study clearly suggests that [Pd(NHC)(acac)Cl] should be routinely included during the development of new cross-coupling methods. An assay for in situ screening of NHC salts in this cross-coupling manifold is presented.
Collapse
Affiliation(s)
- Tongliang Zhou
- Department of Chemistry , Rutgers University , 73 Warren Street , Newark , New Jersey 07102 , United States
| | - Guangchen Li
- Department of Chemistry , Rutgers University , 73 Warren Street , Newark , New Jersey 07102 , United States
| | - Steven P Nolan
- Department of Chemistry and Center for Sustainable Chemistry , Ghent University , Krijgslaan 281 , 9000 Ghent , Belgium
| | - Michal Szostak
- College of Chemistry and Chemical Engineering and Key Laboratory of Auxiliary Chemistry and Technology for Chemical Industry, Ministry of Education , Shaanxi University of Science and Technology , Xi'an 710021 , China.,Department of Chemistry , Rutgers University , 73 Warren Street , Newark , New Jersey 07102 , United States
| |
Collapse
|
130
|
Winnacker M, Beringer AJG, Gronauer TF, Güngör HH, Reinschlüssel L, Rieger B, Sieber SA. Polyamide/PEG Blends as Biocompatible Biomaterials for the Convenient Regulation of Cell Adhesion and Growth. Macromol Rapid Commun 2019; 40:e1900091. [DOI: 10.1002/marc.201900091] [Citation(s) in RCA: 23] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/25/2019] [Revised: 03/25/2019] [Indexed: 01/03/2023]
Affiliation(s)
- Malte Winnacker
- WACKER‐Lehrstuhl für Makromolekulare ChemieLichtenbergstraße 4Department of ChemistryTechnische Universität München 85747 Garching bei München Germany
- Catalysis Research CenterTechnische Universität München Ernst‐Otto‐Fischer‐Straße 1 85748 Garching bei München Germany
| | - Andreas J. G. Beringer
- WACKER‐Lehrstuhl für Makromolekulare ChemieLichtenbergstraße 4Department of ChemistryTechnische Universität München 85747 Garching bei München Germany
- Catalysis Research CenterTechnische Universität München Ernst‐Otto‐Fischer‐Straße 1 85748 Garching bei München Germany
- Department of ChemistryLudwig‐Maximilians‐Universität München
| | - Thomas F. Gronauer
- WACKER‐Lehrstuhl für Makromolekulare ChemieLichtenbergstraße 4Department of ChemistryTechnische Universität München 85747 Garching bei München Germany
- Catalysis Research CenterTechnische Universität München Ernst‐Otto‐Fischer‐Straße 1 85748 Garching bei München Germany
- Chair of Organic Chemistry IITechnische Universität München
| | - Hicran H. Güngör
- WACKER‐Lehrstuhl für Makromolekulare ChemieLichtenbergstraße 4Department of ChemistryTechnische Universität München 85747 Garching bei München Germany
- Catalysis Research CenterTechnische Universität München Ernst‐Otto‐Fischer‐Straße 1 85748 Garching bei München Germany
| | - Leonhard Reinschlüssel
- WACKER‐Lehrstuhl für Makromolekulare ChemieLichtenbergstraße 4Department of ChemistryTechnische Universität München 85747 Garching bei München Germany
- Catalysis Research CenterTechnische Universität München Ernst‐Otto‐Fischer‐Straße 1 85748 Garching bei München Germany
| | - Bernhard Rieger
- WACKER‐Lehrstuhl für Makromolekulare ChemieLichtenbergstraße 4Department of ChemistryTechnische Universität München 85747 Garching bei München Germany
- Catalysis Research CenterTechnische Universität München Ernst‐Otto‐Fischer‐Straße 1 85748 Garching bei München Germany
| | - Stephan A. Sieber
- WACKER‐Lehrstuhl für Makromolekulare ChemieLichtenbergstraße 4Department of ChemistryTechnische Universität München 85747 Garching bei München Germany
- Catalysis Research CenterTechnische Universität München Ernst‐Otto‐Fischer‐Straße 1 85748 Garching bei München Germany
- Chair of Organic Chemistry IITechnische Universität München
| |
Collapse
|
131
|
Pace V, Holzer W, Ielo L, Shi S, Meng G, Hanna M, Szostak R, Szostak M. 17O NMR and 15N NMR chemical shifts of sterically-hindered amides: ground-state destabilization in amide electrophilicity. Chem Commun (Camb) 2019; 55:4423-4426. [PMID: 30916689 DOI: 10.1039/c9cc01402k] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
The structure and spectroscopic properties of the amide bond are a topic of fundamental interest in chemistry and biology. Herein, we report 17O NMR and 15N NMR spectroscopic data for four series of sterically-hindered acyclic amides. Despite the utility of 17O NMR and 15N NMR spectroscopy, these methods are severely underutilized in the experimental determination of electronic properties of the amide bond. The data demonstrate that a combined use of 17O NMR and 15N NMR serves as a powerful tool in assessing electronic effects of the amide bond substitution as a measure of electrophilicity of the amide bond. Notably, we demonstrate that steric destabilization of the amide bond results in electronically-activated amides that are comparable in terms of electrophilicity to acyl fluorides and carboxylic acid anhydrides.
Collapse
Affiliation(s)
- Vittorio Pace
- Department of Pharmaceutical Chemistry, Faculty of Life Sciences, University of Vienna, Althanstrasse 14, Vienna A-1090, Austria.
| | | | | | | | | | | | | | | |
Collapse
|
132
|
Mourgas G, Giebel E, Schneck T, Unold J, Buchmeiser MR. Syntheses of intrinsically flame‐retardant polyamide 6 fibers and fabrics. J Appl Polym Sci 2019. [DOI: 10.1002/app.47829] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Georgios Mourgas
- German Institutes of Textile and Fiber Research Körschtalstrasse 26, D‐73770 Denkendorf Germany
| | - Elisabeth Giebel
- German Institutes of Textile and Fiber Research Körschtalstrasse 26, D‐73770 Denkendorf Germany
| | - Tanja Schneck
- German Institutes of Textile and Fiber Research Körschtalstrasse 26, D‐73770 Denkendorf Germany
| | - Joerg Unold
- German Institutes of Textile and Fiber Research Körschtalstrasse 26, D‐73770 Denkendorf Germany
| | - Michael R. Buchmeiser
- Institute of Polymer ChemistryUniversity of Stuttgart, Pfaffenwaldring 55, D‐70569 Stuttgart Germany
| |
Collapse
|
133
|
Shi S, Szostak M. Decarbonylative Borylation of Amides by Palladium Catalysis. ACS OMEGA 2019; 4:4901-4907. [PMID: 31459674 PMCID: PMC6647946 DOI: 10.1021/acsomega.9b00081] [Citation(s) in RCA: 28] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 01/10/2019] [Accepted: 02/18/2019] [Indexed: 06/10/2023]
Abstract
The development of transition-metal-catalyzed borylation reactions is of significant importance for the fields of organic synthesis and medicinal chemistry because of the versatility of organoboron functional groups. Herein, we report the direct decarbonylative borylation of amides by highly selective carbon-nitrogen bond cleavage by palladium catalysis. The approach capitalizes on the ground-state destabilization of the amide bond in N-acyl glutarimides to achieve Pd-catalyzed insertion into the amide N-C bond and decarbonylation (deamidation). Mechanistic studies and the utility of this methodology in orthogonal sequential cross-couplings of robust, bench-stable amides are reported.
Collapse
|
134
|
Crystalline Structures and Structural Transitions of Copolyamides Derived from 1,4-Diaminobutane and Different Ratios of Glutaric and Azelaic Acids. Polymers (Basel) 2019; 11:polym11040572. [PMID: 30960556 PMCID: PMC6523342 DOI: 10.3390/polym11040572] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2019] [Revised: 03/16/2019] [Accepted: 03/18/2019] [Indexed: 11/16/2022] Open
Abstract
Copolyamides derived from even 1,4-butanediamine and different mixtures of odd dicarboxylic acids with a great difference in the number of methylene groups (i.e., glutaric and azelaic acids with 3 and 7 groups, respectively) have been synthesized, characterized and structurally studied. Calorimetric analyses revealed a complex behavior with multiple melting peaks associated to lamellar reordering and the presence of defective crystals. Equilibrium melting temperatures were evaluated and showed a eutectic behavior with composition. Copolymers were able to crystallize even for samples with comonomer percentages close to 50%. Negative and ringed spherulites from the melt state and small lath-like lamellar crystals from dilute solution crystallizations were attained. Furthermore, calorimetric data pointed out the exclusion of the less abundant monomer from the lattice of the predominant structure. All samples at room temperature showed a similar crystalline structure (form I) defined by two predominant reflections at spacings close to 0.430 and 0.380 nm, which has been related for even-odd nylons with a two-hydrogen bonded structure. Real time synchrotron experiments showed that melt crystallized samples have two polymorphic transitions on heating, which were practically reversible and consequently were also detected during cooling from the melt state. Interestingly, a different behavior was detected among solution crystallized samples and specifically the transition to the intermediate structure (form II) was not detected during heating for samples enriched on the azelate component or more precisely when they were exclusively crystallized in the form I.
Collapse
|
135
|
Stockmann PN, Pastoetter DL, Woelbing M, Falcke C, Winnacker M, Strittmatter H, Sieber V. New Bio-Polyamides from Terpenes: α-Pinene and (+)-3-Carene as Valuable Resources for Lactam Production. Macromol Rapid Commun 2019; 40:e1800903. [PMID: 30892749 DOI: 10.1002/marc.201800903] [Citation(s) in RCA: 22] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/17/2018] [Revised: 03/03/2019] [Indexed: 11/08/2022]
Abstract
The synthesis and polymerization of two β-lactams and two ε-lactams derived from the terpenes α-pinene and (+)-3-carene are reported. The new biopolymers can be considered as polyamide 2 (PA2) and polyamide 6 (PA6)-types with aliphatic stereoregular side chains, which lead to remarkable new properties. The macromolecules are investigated by gel permeation chromatography (GPC), nuclear magnetic resonance (NMR), differential scanning calorimetry (DSC), and infrared (IR). The (+)-3-carene-derived PA6-type is of particular interest, since it reaches a molecular weight of over 30 kDa, which is the highest value for lactam-based polyamides derived from terpenes reported to date. Additionally, a glass transition temperature (Tg ) of 120 °C is observed, surpassing the glass transition temperature of PA6 by 60 °C. The absence of a melting point (Tm ) indicates high amorphicity, another novelty for terpene-based polyamides, which might give transparent bio-polyamides access to new fields of application.
Collapse
Affiliation(s)
- Paul N Stockmann
- Fraunhofer IGB, Straubing Branch Bio, Electro and Chemocatalysis BioCat, Schulgasse 11a, 94315, Straubing, Germany
| | - Dominik L Pastoetter
- Fraunhofer IGB, Straubing Branch Bio, Electro and Chemocatalysis BioCat, Schulgasse 11a, 94315, Straubing, Germany
| | - Marion Woelbing
- Fraunhofer IGB, Straubing Branch Bio, Electro and Chemocatalysis BioCat, Schulgasse 11a, 94315, Straubing, Germany
| | - Claudia Falcke
- Fraunhofer IGB, Straubing Branch Bio, Electro and Chemocatalysis BioCat, Schulgasse 11a, 94315, Straubing, Germany
| | - Malte Winnacker
- WACKER-Chair of Macromolecular Chemistry, Technical University of Munich, Lichtenbergstraße 4, 85748, Garching bei München, Germany
| | - Harald Strittmatter
- Fraunhofer IGB, Straubing Branch Bio, Electro and Chemocatalysis BioCat, Schulgasse 11a, 94315, Straubing, Germany
| | - Volker Sieber
- Fraunhofer IGB, Straubing Branch Bio, Electro and Chemocatalysis BioCat, Schulgasse 11a, 94315, Straubing, Germany.,Chair of Chemistry for Biogenic Resources, Campus Straubing for Biotechnology and Sustainability, Technical University of Munich, Schulgasse 16, 94315, Straubing, Germany.,Catalysis Research Center, Technical University of Munich, 85748, Garching bei München, Germany
| |
Collapse
|
136
|
Toughened and hydrophobically modified polyamide 11 copolymers with dimer acids derived from waste vegetable oil. J Appl Polym Sci 2019. [DOI: 10.1002/app.47174] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
|
137
|
Shi S, Lalancette R, Szostak R, Szostak M. Triflamides: Highly Reactive, Electronically Activated N-Sulfonyl Amides in Catalytic N-C(O) Amide Cross-Coupling. Org Lett 2019; 21:1253-1257. [PMID: 30768275 DOI: 10.1021/acs.orglett.8b03901] [Citation(s) in RCA: 27] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The direct, highly chemoselective Suzuki-Miyaura cross-coupling of trifluoromethanesulfonamides (triflamides) by selective N-C(O) amide bond cleavage is reported. This operationally simple, mild, and user-friendly method accomplishes the direct synthesis of ketones from amides by a catalytic manifold as a powerful alternative to Weinreb amides. Mechanistic studies support rotational inversion and electronic activation, favoring selective insertion under mild conditions. Our data strongly suggest that triflamides should be routinely considered as precursors in amide bond cross-coupling.
Collapse
Affiliation(s)
- Shicheng Shi
- Department of Chemistry , Rutgers University , 73 Warren Street , Newark , New Jersey 07102 , United States
| | - Roger Lalancette
- Department of Chemistry , Rutgers University , 73 Warren Street , Newark , New Jersey 07102 , United States
| | - Roman Szostak
- Department of Chemistry , Wroclaw University , F. Joliot-Curie 14 , Wroclaw 50-383 , Poland
| | - Michal Szostak
- Department of Chemistry , Rutgers University , 73 Warren Street , Newark , New Jersey 07102 , United States
| |
Collapse
|
138
|
Zhou PX, Shi S, Wang J, Zhang Y, Li C, Ge C. Palladium/copper-catalyzed decarbonylative heteroarylation of amides via C–N bond activation. Org Chem Front 2019. [DOI: 10.1039/c9qo00106a] [Citation(s) in RCA: 29] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Abstract
A novel strategy for the synthesis of 2-arylated oxazole derivatives via palladium/copper-catalyzed decarbonylative heteroarylation of amides via C–N bond activation by ground-state destabilization is reported.
Collapse
Affiliation(s)
- Ping-Xin Zhou
- School of Basic Medical Sciences
- Xinxiang Medical University
- Xinxiang
- China
| | - Shuai Shi
- School of Foreign Language
- Xinxiang Medical University
- Xinxiang
- China
| | - Jia Wang
- School of Basic Medical Sciences
- Xinxiang Medical University
- Xinxiang
- China
| | - Yalei Zhang
- School of Basic Medical Sciences
- Xinxiang Medical University
- Xinxiang
- China
| | - Changzheng Li
- School of Basic Medical Sciences
- Xinxiang Medical University
- Xinxiang
- China
| | - Chunpo Ge
- School of Basic Medical Sciences
- Xinxiang Medical University
- Xinxiang
- China
| |
Collapse
|
139
|
Yang ML, Wu YX, Liu Y, Qiu JJ, Liu CM. A novel bio-based AB2 monomer for preparing hyperbranched polyamides derived from levulinic acid and furfurylamine. Polym Chem 2019. [DOI: 10.1039/c9py01253b] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
A new AB2 type bio-based monomer (FDA-E) with two amino functional groups and one ester functional group was prepared from renewable levulinic acid and furfurylamine using a three-step reaction.
Collapse
Affiliation(s)
- Meng-Ling Yang
- Key Laboratory of Material Chemistry for Energy Conversion and Storage
- Ministry of Education
- Hubei Key Laboratory of Material Chemistry and Service Failure
- School of Chemistry and Chemical Engineering
- Huazhong University of Science and Technology
| | - Yue-Xiao Wu
- Key Laboratory of Material Chemistry for Energy Conversion and Storage
- Ministry of Education
- Hubei Key Laboratory of Material Chemistry and Service Failure
- School of Chemistry and Chemical Engineering
- Huazhong University of Science and Technology
| | - Yun Liu
- School of Chemical and Environmental Engineering
- Jianghan University
- Wuhan
- P. R. China
| | - Jin-Jun Qiu
- Key Laboratory of Material Chemistry for Energy Conversion and Storage
- Ministry of Education
- Hubei Key Laboratory of Material Chemistry and Service Failure
- School of Chemistry and Chemical Engineering
- Huazhong University of Science and Technology
| | - Cheng-Mei Liu
- Key Laboratory of Material Chemistry for Energy Conversion and Storage
- Ministry of Education
- Hubei Key Laboratory of Material Chemistry and Service Failure
- School of Chemistry and Chemical Engineering
- Huazhong University of Science and Technology
| |
Collapse
|
140
|
Li Y, Chen W, Gao R, Zhao Z, Zhang T, Xing G, Chen L. 2D covalent organic frameworks with built-in amide active sites for efficient heterogeneous catalysis. Chem Commun (Camb) 2019; 55:14538-14541. [DOI: 10.1039/c9cc07500c] [Citation(s) in RCA: 28] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
Two new amide functionalized covalent organic frameworks (COFs) were synthesized via a bottom-up strategy and used as heterogeneous catalysts toward Knoevenagel condensation with excellent performance.
Collapse
Affiliation(s)
- Yang Li
- Department of Chemistry
- Tianjin Key Laboratory of Molecular Optoelectronic Science
- School of Science
- Tianjin University
- Tianjin 300072
| | - Weiben Chen
- Department of Chemistry
- Tianjin Key Laboratory of Molecular Optoelectronic Science
- School of Science
- Tianjin University
- Tianjin 300072
| | - Ruidong Gao
- Department of Chemistry
- Tianjin Key Laboratory of Molecular Optoelectronic Science
- School of Science
- Tianjin University
- Tianjin 300072
| | - Ziqiang Zhao
- Department of Chemistry
- Tianjin Key Laboratory of Molecular Optoelectronic Science
- School of Science
- Tianjin University
- Tianjin 300072
| | - Ting Zhang
- Department of Chemistry
- Tianjin Key Laboratory of Molecular Optoelectronic Science
- School of Science
- Tianjin University
- Tianjin 300072
| | - Guolong Xing
- Department of Chemistry
- Tianjin Key Laboratory of Molecular Optoelectronic Science
- School of Science
- Tianjin University
- Tianjin 300072
| | - Long Chen
- Department of Chemistry
- Tianjin Key Laboratory of Molecular Optoelectronic Science
- School of Science
- Tianjin University
- Tianjin 300072
| |
Collapse
|
141
|
Biallas P, Heider J, Kirsch SF. Functional polyamides withgem-diazido units: synthesis and diversification. Polym Chem 2019. [DOI: 10.1039/c8py01087k] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
Polyamide structures bearing geminal diazide units were constructed with diazidated malonates and diamines.
Collapse
Affiliation(s)
| | - Janina Heider
- Bergische Universität Wuppertal
- 42119 Wuppertal
- Germany
| | | |
Collapse
|
142
|
Wolf T, Wurm FR. Organocatalytic Ring-opening Polymerization Towards Poly(cyclopropane)s, Poly(lactame)s, Poly(aziridine)s, Poly(siloxane)s, Poly(carbosiloxane)s, Poly(phosphate)s, Poly(phosphonate)s, Poly(thiolactone)s, Poly(thionolactone)s and Poly(thiirane)s. ORGANIC CATALYSIS FOR POLYMERISATION 2018. [DOI: 10.1039/9781788015738-00406] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
Abstract
The following chapter is a collection of monomers that undergo organocatalyzed ring-opening polymerizations and have not been covered in a separate chapter of this book. This includes polymers widely used in industrial applications, but also solely academically relevant and more “exotic” polymer classes. As most of these polymers contain heteroatoms in their backbone, the chapter is divided according to the respective heteroatoms. Each sub-section first gives a short introduction to the respective polymer or monomer properties and industrial applications (if available), followed by a brief summary of the traditional synthetic pathways. Afterwards, important milestones for the organocatalytic ROP are presented in chronological order. Special emphasis is put on the advantages and disadvantages of organocatalysis over traditional (ROP) methods on the basis of appropriate literature examples.
Collapse
Affiliation(s)
- Thomas Wolf
- Max Planck-Institut für Polymerforschung Ackermannweg 10 55128 Mainz Germany
| | - Frederik R. Wurm
- Max Planck-Institut für Polymerforschung Ackermannweg 10 55128 Mainz Germany
| |
Collapse
|
143
|
Bisz E, Szostak M. Iron‐Catalyzed C(
sp
2
)−C(
sp
3
) Cross‐Coupling of Chlorobenzamides with Alkyl Grignard Reagents: Development of Catalyst System, Synthetic Scope, and Application. Adv Synth Catal 2018. [DOI: 10.1002/adsc.201800849] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Affiliation(s)
- Elwira Bisz
- Department of Chemistry Opole University 48 Oleska Street Opole 45-052 Poland
| | - Michal Szostak
- Department of Chemistry Opole University 48 Oleska Street Opole 45-052 Poland
- Department of Chemistry Rutgers University 73 Warren Street Newark NJ 07102 United States
| |
Collapse
|
144
|
Piontek A, Bisz E, Dziuk B, Szostak R, Szostak M. Structures and energetic properties of 4-halobenzamides. ACTA CRYSTALLOGRAPHICA SECTION C-STRUCTURAL CHEMISTRY 2018; 74:1395-1402. [PMID: 30398194 DOI: 10.1107/s2053229618013463] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/25/2018] [Accepted: 09/20/2018] [Indexed: 01/17/2023]
Abstract
The amide bond represents one of the most fundamental functional groups in chemistry. The properties of amides are defined by amidic resonance (nN→π*C=O conjugation), which enforces planarity of the six atoms comprising the amide bond. Despite the importance of 4-halo-substituted benzamides in organic synthesis, molecular interactions and medicinal chemistry, the effect of 4-halo-substitution on the properties of the amide bond in N,N-disubstituted benzamides has not been studied. Herein, we report the crystal structures and energetic properties of a full series of 4-halobenzamides. The structures of four 4-halobenzamides (halo = iodo, bromo, chloro and fluoro) in the N-morpholinyl series have been determined, namely 4-[(4-halophenyl)carbonyl]morpholine, C11H12XNO2, for halo = iodo (X = I), bromo (X = Br), chloro (X = Cl) and fluoro (X = F). Computations have been used to determine the effect of halogen substitution on the structures and resonance energies. 4-Iodo-N-morpholinylbenzamide crystallized with a significant distortion of the amide bond (τ + χN = 33°). The present study supports the correlation between the Ar-C(O) axis twist angle and the twist angle of the amide N-C(O) bond. Comparison of resonance energies in synthetically valuable N-morpholinyl and N-piperidinyl amides demonstrates that the O atom of the morpholinyl ring has a negligible effect on amidic resonance in the series.
Collapse
Affiliation(s)
- Aleksandra Piontek
- Department of Chemistry, University of Opole, 48 Oleska Street, Opole 45-052, Poland
| | - Elwira Bisz
- Department of Chemistry, University of Opole, 48 Oleska Street, Opole 45-052, Poland
| | - Błażej Dziuk
- Department of Chemistry, University of Opole, 48 Oleska Street, Opole 45-052, Poland
| | - Roman Szostak
- Department of Chemistry, Wroclaw University, F. Joliot-Curie 14, Wroclaw 50-383, Poland
| | - Michal Szostak
- Department of Chemistry, Rutgers University, 73 Warren Street, Newark, NJ 07102, USA
| |
Collapse
|
145
|
Shi S, Nolan SP, Szostak M. Well-Defined Palladium(II)-NHC Precatalysts for Cross-Coupling Reactions of Amides and Esters by Selective N-C/O-C Cleavage. Acc Chem Res 2018; 51:2589-2599. [PMID: 30240190 DOI: 10.1021/acs.accounts.8b00410] [Citation(s) in RCA: 280] [Impact Index Per Article: 46.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Transition-metal-catalyzed cross-coupling reactions represent a most powerful tool for the rapid construction of C-C and C-X bonds available to synthetic chemists. Recently, tremendous progress has been made in the burgeoning area of cross-coupling reactions of amides and esters enabled by regio- and chemoselective acyl C-X (X = N, O) cleavage using well-defined Pd(II)-NHC complexes. The use of N-heterocyclic carbenes as ligands in palladium-catalyzed cross-couplings permits reactions of amides and esters that were previously impossible using palladium or could be achieved only under harsh conditions. These reactions provide an attractive method to synthetic chemists to manipulate the traditionally inert amide and ester bonds with the broad cross-coupling generality inherent to palladium catalysis. Research in the area of cross-coupling of stable acyl electrophiles can be broadly categorized by the type of electrophile undergoing the cross-coupling. Recent studies have shown that cross-coupling of amides by transition-metal catalysis represents one of the most straightforward and wide-ranging ways of manipulating the classically inert amide bonds into generic acyl-metal intermediates that can be systematically exploited in cross-coupling reactions as a new paradigm in organic synthesis. The key to achieving high chemoselectivity of the process is control of amidic resonance (nN to πC═O* conjugation, rotation of ca. 15-20 kcal/mol in planar amides), enabling oxidative addition of the N-C amide bond to a metal in a rational and predictable manner. This mode of catalysis has been extended to C(acyl)-O cross-coupling reactions of aryl esters, where selective C-O bond cleavage is accomplished through a rational match of aryl ester electrophiles and nucleophilic metal catalysts. These two types of transition-metal-catalyzed cross-coupling reactions represent an attractive concept in synthetic chemistry because of the ubiquity of esters and amides as precursors in organic synthesis. Furthermore, the high stability of amides and esters provides unprecedented opportunities for orthogonal cross-coupling strategies in the presence of other electrophiles. In this Account, we highlight advances that have taken place in the past few years in the field of cross-coupling of amides and esters, focusing on both (1) the stereoelectronic properties of well-defined Pd(II)-NHC complexes that have been critical to realize this challenging cross-coupling manifold and (2) the role of the isomerization barrier of the acyl electrophiles undergoing the cross-coupling. In a broader sense, the chemistry described here provides a practical approach to functionalize common amide and ester functional groups in organic synthesis and establishes straightforward access to acyl-metal intermediates that enable nonconventional cross-coupling strategies.
Collapse
Affiliation(s)
- Shicheng Shi
- Department of Chemistry, Rutgers University, 73 Warren Street, Newark, New Jersey 07102, United States
| | - Steven P. Nolan
- Department of Chemistry and Center for Sustainable Chemistry, Ghent University, Krijgslaan 281, 9000 Ghent, Belgium
- Department of Chemistry, College of Sciences, King Saud University, PO Box 2455, Riyadh, 11451, Saudi Arabia
| | - Michal Szostak
- Department of Chemistry, Rutgers University, 73 Warren Street, Newark, New Jersey 07102, United States
| |
Collapse
|
146
|
He W, Tao Y, Wang X. Functional Polyamides: A Sustainable Access via Lysine Cyclization and Organocatalytic Ring-Opening Polymerization. Macromolecules 2018. [DOI: 10.1021/acs.macromol.8b01790] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Affiliation(s)
- Wenjing He
- Key Laboratory of Polymer Ecomaterials and, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Renmin Street 5625, Changchun 130022, P. R. China
- University of
Science and Technology of China, Hefei 230026, P. R. China
| | - Youhua Tao
- Key Laboratory of Polymer Ecomaterials and, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Renmin Street 5625, Changchun 130022, P. R. China
- University of
Science and Technology of China, Hefei 230026, P. R. China
| | - Xianhong Wang
- Key Laboratory of Polymer Ecomaterials and, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Renmin Street 5625, Changchun 130022, P. R. China
- University of
Science and Technology of China, Hefei 230026, P. R. China
| |
Collapse
|
147
|
Li G, Szostak M. Highly selective transition-metal-free transamidation of amides and amidation of esters at room temperature. Nat Commun 2018; 9:4165. [PMID: 30302003 PMCID: PMC6178361 DOI: 10.1038/s41467-018-06623-1] [Citation(s) in RCA: 138] [Impact Index Per Article: 23.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/29/2018] [Accepted: 09/10/2018] [Indexed: 12/22/2022] Open
Abstract
Amide chemistry has an essential role in the synthesis of high value molecules, such as pharmaceuticals, natural products, and fine chemicals. Over the past years, several examples of transamidation reactions have been reported. In general, transition-metal-based catalysts or harsh conditions are employed for these transformations due to unfavorable kinetics and thermodynamics of the process. Herein, we report a significant advance in this area and present the general method for transition-metal-free transamidation of amides and amidation of esters by highly selective acyl cleavage with non-nucleophilic amines at room temperature. In contrast to metal-catalyzed protocols, the method is operationally-simple, environmentally-friendly, and operates under exceedingly mild conditions. The practical value is highlighted by the synthesis of valuable amides in high yields. Considering the key role of amides in various branches of chemical science, we envision that this broadly applicable method will be of great interest in organic synthesis, drug discovery, and biochemistry.
Collapse
Affiliation(s)
- Guangchen Li
- Department of Chemistry, Rutgers University, 73 Warren Street, Newark, NJ, 07102, USA
| | - Michal Szostak
- Department of Chemistry, Rutgers University, 73 Warren Street, Newark, NJ, 07102, USA.
| |
Collapse
|
148
|
Zhang C, Cao M, Jiang S, Huang X, Mai K, Yan K. Quick analysis of composition of semi-aromatic copolyamide via 13C NMR study. INTERNATIONAL JOURNAL OF POLYMER ANALYSIS AND CHARACTERIZATION 2018. [DOI: 10.1080/1023666x.2018.1514708] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
Affiliation(s)
- Chuanhui Zhang
- National Certified Enterprise Technology Center, Kingfa Science and Technology Co., LTD, Guangzhou, P. R. China
| | - Min Cao
- National Certified Enterprise Technology Center, Kingfa Science and Technology Co., LTD, Guangzhou, P. R. China
| | - Sujun Jiang
- National Certified Enterprise Technology Center, Kingfa Science and Technology Co., LTD, Guangzhou, P. R. China
| | - Xianbo Huang
- National Certified Enterprise Technology Center, Kingfa Science and Technology Co., LTD, Guangzhou, P. R. China
| | - Kancheng Mai
- Institute of Material Science, School of Chemistry and Chemical Engineering, Sun Yat-Sen University, Guangzhou, P. R. China
| | - Kun Yan
- National Certified Enterprise Technology Center, Kingfa Science and Technology Co., LTD, Guangzhou, P. R. China
- Institute of Material Science, School of Chemistry and Chemical Engineering, Sun Yat-Sen University, Guangzhou, P. R. China
| |
Collapse
|
149
|
Abstract
AbstractFor the past decade, market demands for semicrystalline heat-resistant polyamides (HPAs) with excellent performance and significantly improved heat-resistant temperature has grown rapidly, and they are widely used in the electronic and electrical industry, as light-emitting diodes and in the automobile field (as metal replacements). Industrialized HPAs to date, include PA46, PA6T copolyamides, PA9T and PA10T. Other HPAs being researched include full aliphatic HPA, PA5T, long carbon chain HPA, PXD10 and alicyclic HPA. This review addresses progress in HPAs, especially the properties of HPA, patents analysis and polymerization processes.
Collapse
Affiliation(s)
- Chuanhui Zhang
- National-Certified Enterprise Technology Center, Kingfa Science and Technology Co., LTD., Guangzhou, China
- Guangdong Key Laboratory for Specialty Engineering Plastics, Guangzhou, China
- Zhuhai Vanteque Specialty Engineering Plastics Co., LTD., Zhuhai, China
| |
Collapse
|
150
|
Winnacker M. Pinene: reichlich vorhandene und erneuerbare Bausteine für eine Vielzahl an nachhaltigen Polymeren. Angew Chem Int Ed Engl 2018. [DOI: 10.1002/ange.201804009] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Affiliation(s)
- Malte Winnacker
- WACKER-Lehrstuhl für Makromolekulare Chemie; Technische Universität München; Lichtenbergstraße 4 85747 Garching bei München Deutschland
- Catalysis Research Center (CRC); Ernst-Otto-Fischer Straße 1 85748 Garching bei München Deutschland
| |
Collapse
|