1
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Xu J, Liu J, Chen G, Xiong B, Zhang X, Lian Z. Palladium-catalysed difluoroolefination of benzyl tosylates toward the synthesis of gem-difluoro-2-trifluromethyl styrene derivatives. RSC Adv 2022; 12:12983-12987. [PMID: 35497019 PMCID: PMC9049850 DOI: 10.1039/d2ra02473j] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/17/2022] [Accepted: 04/21/2022] [Indexed: 02/05/2023] Open
Abstract
We have presented an efficient method to access gem-difluoro-2-trifluromethyl styrene derivatives via palladium catalysis. This method features mild reaction conditions, broad substrate scope and good product yields. Moreover, gram–scale reactions demonstrated the robustness and potential of this method. Control experiments revealed that the –CF3 group was essential to the success of this transformation. Finally, the practicality of this method was successfully proven by three synthetic applications. We presented an efficient method to access gem-difluoro-2-trifluromethyl styrene derivatives via palladium catalysis, which features mild reaction conditions and broad substrate scope.![]()
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Affiliation(s)
- Jie Xu
- West China School of Pharmacy, Sichuan University Chengdu 610041 China
| | - Jiangjun Liu
- West China School of Pharmacy, Sichuan University Chengdu 610041 China
| | - Gang Chen
- West China School of Pharmacy, Sichuan University Chengdu 610041 China
| | - Baojian Xiong
- Department of Dermatology, State Key Laboratory of Biotherapy and Cancer Center, West China Hospital, Sichuan University Chengdu 610041 China
| | - Xuemei Zhang
- Department of Dermatology, State Key Laboratory of Biotherapy and Cancer Center, West China Hospital, Sichuan University Chengdu 610041 China
| | - Zhong Lian
- West China School of Pharmacy, Sichuan University Chengdu 610041 China.,Department of Dermatology, State Key Laboratory of Biotherapy and Cancer Center, West China Hospital, Sichuan University Chengdu 610041 China
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2
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Ma F, Li J, Zhang S, Gu Y, Tan T, Chen W, Wang S, Xu H, Yang G, Lerner RA. Metal-Catalyzed One-Pot On-DNA Syntheses of Diarylmethane and Thioether Derivatives. ACS Catal 2022. [DOI: 10.1021/acscatal.1c05338] [Citation(s) in RCA: 10] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Affiliation(s)
- Fei Ma
- Shanghai Institute for Advanced Immunochemical Studies, ShanghaiTech University, Shanghai 201210, China
| | - Jie Li
- Shanghai Institute for Advanced Immunochemical Studies, ShanghaiTech University, Shanghai 201210, China
| | - Shuning Zhang
- Shanghai Institute for Advanced Immunochemical Studies, ShanghaiTech University, Shanghai 201210, China
| | - Yuang Gu
- Shanghai Institute for Advanced Immunochemical Studies, ShanghaiTech University, Shanghai 201210, China
| | - Tingting Tan
- Shanghai Institute for Advanced Immunochemical Studies, ShanghaiTech University, Shanghai 201210, China
| | - Wanting Chen
- Shanghai Institute for Advanced Immunochemical Studies, ShanghaiTech University, Shanghai 201210, China
| | - Shuyue Wang
- Shanghai Institute for Advanced Immunochemical Studies, ShanghaiTech University, Shanghai 201210, China
| | - Hongtao Xu
- Shanghai Institute for Advanced Immunochemical Studies, ShanghaiTech University, Shanghai 201210, China
| | - Guang Yang
- Shanghai Institute for Advanced Immunochemical Studies, ShanghaiTech University, Shanghai 201210, China
| | - Richard A. Lerner
- Department of Chemistry, The Scripps Research Institute, La Jolla, California 92037, United States
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3
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Tran HN, Nguyen CM, Koeritz MT, Youmans DD, Stanley LM. Nickel-Catalyzed Arylative Substitution of Homoallylic Alcohols. Chem Sci 2022; 13:11607-11613. [PMID: 36320388 PMCID: PMC9555571 DOI: 10.1039/d2sc01716d] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/24/2022] [Accepted: 07/11/2022] [Indexed: 11/28/2022] Open
Abstract
Direct coupling of unactivated alcohols remains a challenge in synthetic chemistry. Current approaches to cross-coupling of alcohol-derived electrophiles often involve activated alcohols such as tosylates or carbonates. We report the direct arylative substitution of homoallylic alcohols catalyzed by a nickel-bisphosphine complex as a facile method to generate allylic arenes. These reactions proceed via formation of an allylic alcohol intermediate. Subsequent allylic substitution with arylboroxine nucleophiles enables the formation of a variety of allylic arenes. The presence of p-methoxyphenylboronic acid is crucial to activate the allylic alcohol to achieve high product yields. Arylative substitutions of homoallylic alcohols with arylboron nucleophiles demonstrate the utility of unactivated alcohols as coupling partners in transition metal-catalyzed cross-coupling chemistry.![]()
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Affiliation(s)
- Hai N Tran
- Department of Chemistry, Iowa State University Ames IA 50011 USA
| | - Chau M Nguyen
- Department of Chemistry, Iowa State University Ames IA 50011 USA
| | - Mason T Koeritz
- Department of Chemistry, Iowa State University Ames IA 50011 USA
| | - Dustin D Youmans
- Department of Chemistry, Iowa State University Ames IA 50011 USA
| | - Levi M Stanley
- Department of Chemistry, Iowa State University Ames IA 50011 USA
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4
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Bao Z, Zhou ZY, Mao YT, Shao LX. N-heterocyclic carbene-Pd(II)-1-methylimidazole complex-catalyzed Suzuki-Miyaura coupling of 2-chloro-4-aminoquinazolines with arylboronic acids. Tetrahedron 2020. [DOI: 10.1016/j.tet.2020.131548] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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5
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Zhou T, Szostak M. Palladium-Catalyzed Cross-Couplings by C-O Bond Activation. Catal Sci Technol 2020; 10:5702-5739. [PMID: 33796263 PMCID: PMC8009314 DOI: 10.1039/d0cy01159b] [Citation(s) in RCA: 28] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
Although palladium-catalyzed cross-coupling of aryl halides and reactive pseudohalides has revolutionized the way organic molecules are constructed today across various fields of chemistry, comparatively less progress has been made in the palladium-catalyzed cross-coupling of less reactive C-O electrophiles. This is despite the fact that the use of phenols and phenol derivatives as bench-stable cross-coupling partners has been well-recognized to bring about major advantages over aryl halides, such as (1) natural abundance of phenols, (2) avoidance of toxic halides, (3) orthogonal cross-coupling conditions, (4) prefunctionalization of phenolic substrates by electrophilic substitution or C-H functionalization, (5) ready availability of phenols from a different pool of precursors than aryl halides. In this review, we present an overview of recent advances made in the field of palladium-catalyzed cross-coupling of C-O electrophiles with a focus on (1) catalytic systems, (2) reaction type, and (3) class of C-O coupling partners. Although the field has been historically dominated by nickel catalysis, it is now evident that the use of more versatile, more functional group tolerant and highly active palladium catalysts supported by appropriately designed ancillary ligands enables the cross-coupling with improved substrate scope and generality, and likely represents a practical solution to the broadly applicable cross-coupling of various C-O bonds across diverse chemical disciplines. The review covers the period through June 2020.
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Affiliation(s)
- Tongliang Zhou
- Department of Chemistry, Rutgers University, 73 Warren Street, Newark, NJ 07102, United States
| | - Michal Szostak
- Department of Chemistry, Rutgers University, 73 Warren Street, Newark, NJ 07102, United States
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6
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Kumar Chenniappan V, Peck D, Rahaim R. Nickel catalyzed deoxygenative cross-coupling of benzyl alcohols with aryl-bromides. Tetrahedron Lett 2020. [DOI: 10.1016/j.tetlet.2020.151729] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
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7
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Kumar S. Recent Advances in the Schiff Bases and
N
‐Heterocyclic Carbenes as Ligands in the Cross‐Coupling Reactions: A Comprehensive Review. J Heterocycl Chem 2019. [DOI: 10.1002/jhet.3504] [Citation(s) in RCA: 22] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Affiliation(s)
- Sumit Kumar
- Department of Chemistry Central University of Haryana Jant‐Pali Mahendergarh 123031 India
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8
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Zhao C, Zha GF, Fang WY, Rakesh KP, Qin HL. Construction of Di(hetero)arylmethanes Through Pd-Catalyzed Direct Dehydroxylative Cross-Coupling of Benzylic Alcohols and Aryl Boronic Acids Mediated by Sulfuryl Fluoride (SO2
F2
). European J Org Chem 2019. [DOI: 10.1002/ejoc.201801888] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Chuang Zhao
- State Key Laboratory of Silicate Materials for Architectures; and School of Chemistry; Chemical Engineering and Life Science; Wuhan University of Technology; 430070 Wuhan Hubei Province People's Republic of China
| | - Gao-Feng Zha
- State Key Laboratory of Silicate Materials for Architectures; and School of Chemistry; Chemical Engineering and Life Science; Wuhan University of Technology; 430070 Wuhan Hubei Province People's Republic of China
| | - Wan-Yin Fang
- State Key Laboratory of Silicate Materials for Architectures; and School of Chemistry; Chemical Engineering and Life Science; Wuhan University of Technology; 430070 Wuhan Hubei Province People's Republic of China
| | - K. P. Rakesh
- State Key Laboratory of Silicate Materials for Architectures; and School of Chemistry; Chemical Engineering and Life Science; Wuhan University of Technology; 430070 Wuhan Hubei Province People's Republic of China
| | - Hua-Li Qin
- State Key Laboratory of Silicate Materials for Architectures; and School of Chemistry; Chemical Engineering and Life Science; Wuhan University of Technology; 430070 Wuhan Hubei Province People's Republic of China
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9
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Sobhani S, Chahkamali FO, Sansano JM. A new bifunctional heterogeneous nanocatalyst for one-pot reduction-Schiff base condensation and reduction–carbonylation of nitroarenes. RSC Adv 2019; 9:1362-1372. [PMID: 35518036 PMCID: PMC9059666 DOI: 10.1039/c8ra10212k] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/12/2018] [Accepted: 01/02/2019] [Indexed: 11/21/2022] Open
Abstract
In this work, synthesis of Pd–NHC-γ-Fe2O3-n-butyl-SO3H and its activity as a bifunctional heterogeneous nanocatalyst containing Pd–NHC and acidic functional groups, are described. This newly synthesized nanomagnetic catalyst is fully characterized by different methods such as FT-IR, XPS, TEM, VSM, ICP and TG analysis. At first, the catalytic activity of Pd–NHC-γ-Fe2O3-n-butyl-SO3H is evaluated for the reduction of nitroarenes in aqueous media using NaBH4 as a clean source of hydrogen generation at ambient temperature. Using the promising results obtained from the nitroarene reduction, this catalytic system is used for two one-pot protocols including reduction-Schiff base condensation and reduction–carbonylation of various nitroarenes. In these reactions the in situ formed amines are further reacted with aldehydes to yield imines or carbonylated to amides. The desired products are obtained in good to high yields in the presence of Pd–NHC-γ-Fe2O3-n-butyl-SO3H as a bifunctional catalyst. The catalyst is reused with the aid of a magnetic bar for up to six consecutive cycles without any drastic loss of its catalytic activity. This paper presents synthesis of Pd–NHC-γ-Fe2O3-n-butyl-SO3H and its activity as bifunctional heterogeneous nanocatalyst containing Pd–NHC and acidic functional groups.![]()
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Affiliation(s)
- Sara Sobhani
- Department of Chemistry
- College of Sciences
- University of Birjand
- Birjand
- Iran
| | | | - José Miguel Sansano
- Departamento de Química Orgánica
- Facultad de Ciencias
- Centro de Innovación en Química Avanzada (ORFEO-CINQA) and Instituto de Síntesis Orgánica (ISO)
- Universidad de Alicante
- 03080-Alicante
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10
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Wang T, Guo J, Wang X, Guo H, Jia D, Wang H, Liu L. Cross coupling of benzylammonium salts with boronic acids using a well-defined N-heterocyclic carbene–palladium(ii) precatalyst. RSC Adv 2019; 9:5738-5741. [PMID: 35515917 PMCID: PMC9060798 DOI: 10.1039/c8ra10439e] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/20/2018] [Accepted: 02/11/2019] [Indexed: 11/25/2022] Open
Abstract
N-heterocyclic carbene–palladium(ii)-catalyzed cross-coupling of benzylammonium salts with arylboronic acids for the synthesis of diarylmethane derivatives via C–N bond activation has been developed. Notably, in the presence of the easily prepared and bench-stable Pd-PEPPSI precatalyst, the Csp3–N bond activation of the benzylammonium salt even proceeded smoothly in isopropanol at room temperature. N-heterocyclic carbene–palladium(ii)-catalyzed cross-coupling of benzylammonium salts with arylboronic acids for the synthesis of diarylmethane derivatives via C–N bond activation has been developed.![]()
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Affiliation(s)
- Tao Wang
- Henan Engineering Laboratory of Green Synthesis for Pharmaceuticals
- School of Chemistry and Chemical Engineering
- Shangqiu Normal University
- Shangqiu
- People's Republic of China
| | - Jiarui Guo
- Henan Engineering Laboratory of Green Synthesis for Pharmaceuticals
- School of Chemistry and Chemical Engineering
- Shangqiu Normal University
- Shangqiu
- People's Republic of China
| | - Xiaojuan Wang
- Henan Engineering Laboratory of Green Synthesis for Pharmaceuticals
- School of Chemistry and Chemical Engineering
- Shangqiu Normal University
- Shangqiu
- People's Republic of China
| | - Han Guo
- Henan Engineering Laboratory of Green Synthesis for Pharmaceuticals
- School of Chemistry and Chemical Engineering
- Shangqiu Normal University
- Shangqiu
- People's Republic of China
| | - Dingli Jia
- Henan Engineering Laboratory of Green Synthesis for Pharmaceuticals
- School of Chemistry and Chemical Engineering
- Shangqiu Normal University
- Shangqiu
- People's Republic of China
| | - Hengjin Wang
- Henan Engineering Laboratory of Green Synthesis for Pharmaceuticals
- School of Chemistry and Chemical Engineering
- Shangqiu Normal University
- Shangqiu
- People's Republic of China
| | - Lantao Liu
- Henan Engineering Laboratory of Green Synthesis for Pharmaceuticals
- School of Chemistry and Chemical Engineering
- Shangqiu Normal University
- Shangqiu
- People's Republic of China
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11
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Sirois LE, Zhao MM, Lim NK, Bednarz MS, Harrison BA, Wu W. Process Development for a Locally Acting SGLT1 Inhibitor, LX2761, Utilizing sp3–sp2 Suzuki Coupling of a Benzyl Carbonate. Org Process Res Dev 2018. [DOI: 10.1021/acs.oprd.8b00325] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
Affiliation(s)
- Lauren E. Sirois
- Chemical Development, Lexicon Pharmaceuticals, Inc., 110 Allen Road, Basking Ridge, New Jersey 07920, United States
| | - Matthew M. Zhao
- Chemical Development, Lexicon Pharmaceuticals, Inc., 110 Allen Road, Basking Ridge, New Jersey 07920, United States
| | - Ngiap-Kie Lim
- Chemical Development, Lexicon Pharmaceuticals, Inc., 110 Allen Road, Basking Ridge, New Jersey 07920, United States
| | - Mark S. Bednarz
- Chemical Development, Lexicon Pharmaceuticals, Inc., 110 Allen Road, Basking Ridge, New Jersey 07920, United States
| | - Bryce A. Harrison
- Chemical Development, Lexicon Pharmaceuticals, Inc., 110 Allen Road, Basking Ridge, New Jersey 07920, United States
| | - Wenxue Wu
- Chemical Development, Lexicon Pharmaceuticals, Inc., 110 Allen Road, Basking Ridge, New Jersey 07920, United States
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12
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Ohsumi M, Ito A, Nishiwaki N. Substrate switchable Suzuki–Miyaura coupling for benzyl ester vs. benzyl halide. RSC Adv 2018; 8:35056-35061. [PMID: 35547057 PMCID: PMC9087645 DOI: 10.1039/c8ra07841f] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/21/2018] [Accepted: 10/08/2018] [Indexed: 11/21/2022] Open
Abstract
Two reaction conditions were developed to accomplish the substrate switchable (benzyl esters vs. benzyl halides) Suzuki–Miyaura coupling.
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Affiliation(s)
- Masato Ohsumi
- Kochi National College of Technology
- Nankoku
- Japan
- School of Environmental Science and Engineering
- Kochi University of Technology
| | - Akitaka Ito
- School of Environmental Science and Engineering
- Kochi University of Technology
- Kami
- Japan
- Research Center for Material Science and Engineering
| | - Nagatoshi Nishiwaki
- School of Environmental Science and Engineering
- Kochi University of Technology
- Kami
- Japan
- Research Center for Material Science and Engineering
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13
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Ramakrishna V, Rani MJ, Reddy ND. A Zwitterionic Palladium(II) Complex as a Precatalyst for Neat-Water-Mediated Cross-Coupling Reactions of Heteroaryl, Benzyl, and Aryl Acid Chlorides with Organoboron Reagents. European J Org Chem 2017. [DOI: 10.1002/ejoc.201701241] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Affiliation(s)
- Visannagari Ramakrishna
- Department of Chemistry; Pondicherry University (A Central University); 605014 Puducherry India
| | - Morla Jhansi Rani
- Department of Chemistry; Pondicherry University (A Central University); 605014 Puducherry India
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14
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Ohsumi M, Nishiwaki N. Selective Synthesis of (Benzyl)biphenyls by Successive Suzuki-Miyaura Coupling of Phenylboronic Acids with 4-Bromobenzyl Acetate under Air Atmosphere. ACS OMEGA 2017; 2:7767-7771. [PMID: 31457333 PMCID: PMC6645156 DOI: 10.1021/acsomega.7b01450] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/28/2017] [Accepted: 10/26/2017] [Indexed: 05/24/2023]
Abstract
An efficient Pd-catalyzed cross-coupling reaction of phenylboronic acids and benzyl carbonates was developed, producing diarylmethanes. Benzyl acetates could also be used as coupling partners instead of benzyl carbonates, affording diarylmethanes in comparable yields. This reaction can be conducted under air atmosphere without any care for moisture and oxygen. The ester function showed an intermediate reactivity between chloro and bromo groups. This property facilitated the selective synthesis of diverse (benzyl)biphenyls by successive Suzuki-Miyaura coupling reactions using bromo- and chloro-substituted benzyl esters with two types of boronic acids.
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Affiliation(s)
- Masato Ohsumi
- Kochi
National College of Technology, Nankoku, Kochi 783-8508, Japan
| | - Nagatoshi Nishiwaki
- School
of Environmental Science and Engineering and Research Center for Material Science
and Engineering, Kochi University of Technology, Tosayamada, Kami, Kochi 782-8502, Japan
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15
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Efficient N -heterocyclic carbene nickel pincer complexes catalyzed cross coupling of benzylic ammonium salts with boronic acids. CHINESE CHEM LETT 2017. [DOI: 10.1016/j.cclet.2016.09.006] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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16
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Yin SC, Zhou YF, Li Y, Qian PC. The crystal structure of 1,3-bis(2,6-diiso-propylphenyl)imidazol-2-ylidene)-dibromido-(1-methyl-1 H-imidazole-κ 1N)palladium(II) – ethyl acetate – water (1/1/1), C 31H 42Br 2N 4Pd. Z KRIST-NEW CRYST ST 2017. [DOI: 10.1515/ncrs-2016-0107] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Abstract
C31H42Br2N4Pd, monoclinic, P21/c, a = 12.3093(14)Å, b = 15.2805(18) Å, c = 20.3205(17) Å, β = 112.213(5)°, V = 3538.5(7) Å3, Z = 4, R
gt(F) = 0.0540, wR
ref(F
2) = 0.1528, T = 298(2)K.
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Affiliation(s)
- Shun-Chao Yin
- College of Chemistry and Materials Engineering, Wenzhou University, Chashan University Town, Wenzhou Zhejiang Province 325035, People’s Republic of China
| | - Yong-Fang Zhou
- The Tap Water Branch, Wenzhou Public Utilizes, Wenzhou Zhejiang Province 325035 People’s Republic of China
| | - Ye Li
- Pingyang Inspection and Testing Center of Food and Drug, Pingyang Wenzhou Zhejiang Province 325035, People’s Republic of China
| | - Peng-Cheng Qian
- College of Chemistry and Materials Engineering, Wenzhou University, Chashan University Town, Wenzhou Zhejiang Province 325035, People’s Republic of China
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17
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Singh MK, Lakshman MK. Diarylmethanes through an Unprecedented Palladium-Catalyzed C-C Cross-Coupling of 1-(Aryl)methoxy-1 H-Benzotriazoles with Arylboronic Acids. ChemCatChem 2015; 7:4156-4162. [PMID: 27134687 PMCID: PMC4847744 DOI: 10.1002/cctc.201500818] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/23/2015] [Indexed: 11/09/2022]
Abstract
1-(Aryl)methoxy-1H-benzotriazoles (ArCH2OBt) are bench-stable reagents that are prepared readily from 1H-benzotriazol-1-yl-4-methylbenzenesulfonate (BtOTs) and benzylic alcohols. These compounds, which contain a N-O-C bond, undergo cross-coupling with arylboronic acids by C-O bond scission with catalysts that comprise Pd(OAc)2 and biarylphosphine ligands. Such reactivity of ArCH2OBt derivatives, leading to diarylmethanes, has not been described previously and constitutes a new activation of benzylic alcohols. With regard to the various ligands-metal complexes that support catalytic activity, it appears that those with smaller "percent buried volumes" (%Vbur) provide better outcomes. This factor has been evaluated in the initial optimization studies and in further reactions with difficult coupling partners. Ligand electronics of the biaryl moiety seem to play a lesser role in this type of reaction. The bis-coordinating bis[(2-diphenylphosphino)phenyl]ether appears to be suitable to improve the yields of low-yielding reactions.
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Affiliation(s)
- Manish K Singh
- Department of Chemistry, The City College and The City University of New York, 160 Convent Avenue, New York, NY 10031
| | - Mahesh K Lakshman
- Department of Chemistry, The City College and The City University of New York, 160 Convent Avenue, New York, NY 10031
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18
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Wang XX, Luo MJ, Lu JM. N-Heterocyclic carbene-palladium(ii)-1-methylimidazole complex-catalyzed Suzuki-Miyaura coupling of benzyl carbamates with arylboronic acids. Org Biomol Chem 2015; 13:11438-44. [PMID: 26446833 DOI: 10.1039/c5ob01782c] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The Suzuki-Miyaura coupling of benzyl carbamates with arylboronic acids was achieved in an environmentally benign medium. Using water as the sole solvent, such transformation took place very well to give the desired diarylmethane derivatives in good to almost quantitative yields in the presence of a well-defined NHC-Pd(ii)-Im complex under mild conditions. It is worth noting here that this is the first example of benzyl carbamates used in coupling reaction, thus affording a new method for the formation of diarylmethanes by palladium-catalyzed C-O bond activation.
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Affiliation(s)
- Xiao-Xia Wang
- College of Chemistry and Materials Engineering, Wenzhou University, Chashan University Town, Wenzhou, Zhejiang Province 325035, People's Republic of China.
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19
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N-heterocyclic carbene-Pd(II)-1-methylimidazole complex catalyzed C–H bond benzylation of (benzo)oxazoles with benzyl chlorides. Tetrahedron 2015. [DOI: 10.1016/j.tet.2015.07.030] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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