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Sen A, Zhu L, Takizawa S, Takenaka K, Sasai H. Synthesis of Allylamine Derivatives
via
Intermolecular Aza‐Wacker‐Type Reaction Promoted by Palladium‐SPRIX Catalyst. Adv Synth Catal 2020. [DOI: 10.1002/adsc.202000644] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Abhijit Sen
- The Institute of Scientific and Industrial ResearchOsaka University 8-1 Mihogaoka Ibaraki Osaka 567-0047 Japan
- Present Address: RIKENCenter for Sustainable Resource Science Wako Saitama 351-0198 Japan
| | - Linpeng Zhu
- The Institute of Scientific and Industrial ResearchOsaka University 8-1 Mihogaoka Ibaraki Osaka 567-0047 Japan
| | - Shinobu Takizawa
- The Institute of Scientific and Industrial ResearchOsaka University 8-1 Mihogaoka Ibaraki Osaka 567-0047 Japan
| | - Kazuhiro Takenaka
- The Institute of Scientific and Industrial ResearchOsaka University 8-1 Mihogaoka Ibaraki Osaka 567-0047 Japan
- Present Address: National Institute of TechnologyKagawa College 551 Kohda, Takuma-cho, Mitoyo-shi Kagawa 769-1192 Japan
| | - Hiroaki Sasai
- The Institute of Scientific and Industrial ResearchOsaka University 8-1 Mihogaoka Ibaraki Osaka 567-0047 Japan
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Abstract
This review is focused on palladium-catalyzed reactions as efficient strategies aimed at the synthesis of different classes of benzodiazepines. Several reaction typologies are reported including hydroamination, amination, C–H arylation, N-arylation, and the Buchwald–Hartwig reaction, depending on the different substrates identified as halogenated starting materials (activated substrates) or unactivated unsaturated systems, which then exploit Pd(0)- or Pd(II)-catalytic species. In particular, the use of the domino reactions, as intra- or intermolecular processes, are reported as an efficient and eco-compatible tool to obtain differently functionalized benzodiazepines. Different domino reaction typologies are the carboamination, aminoarylation, aminoacethoxylation, aminohalogenation, and aminoazidation.
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Xu F, Korch KM, Watson DA. Synthesis of Indolines and Derivatives by Aza-Heck Cyclization. Angew Chem Int Ed Engl 2019; 58:13448-13451. [PMID: 31310448 DOI: 10.1002/anie.201907758] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/21/2019] [Indexed: 11/07/2022]
Abstract
For the first time, an aza-Heck cyclization that allows the preparation of indoline scaffolds is described. Using N-hydroxy anilines as electrophiles, which can be easily accessed from the corresponding nitroarenes, this method provides indolines bearing pendant functionality and complex ring topologies. Synthesis of challenging indolines, such as those bearing fully substituted carbon atoms at C2, is also possible using this method.
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Affiliation(s)
- Feiyang Xu
- Department of Chemistry and Biochemistry, University of Delaware, Newark, DE, 19716, USA
| | - Katerina M Korch
- Department of Chemistry and Biochemistry, University of Delaware, Newark, DE, 19716, USA
| | - Donald A Watson
- Department of Chemistry and Biochemistry, University of Delaware, Newark, DE, 19716, USA
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Xu F, Korch KM, Watson DA. Synthesis of Indolines and Derivatives by Aza‐Heck Cyclization. Angew Chem Int Ed Engl 2019. [DOI: 10.1002/ange.201907758] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Affiliation(s)
- Feiyang Xu
- Department of Chemistry and BiochemistryUniversity of Delaware Newark DE 19716 USA
| | - Katerina M. Korch
- Department of Chemistry and BiochemistryUniversity of Delaware Newark DE 19716 USA
| | - Donald A. Watson
- Department of Chemistry and BiochemistryUniversity of Delaware Newark DE 19716 USA
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Tian Q, Liu Y, Wang X, Wang X, He W. Pd II
/Novel Chiral Cinchona Alkaloid Oxazoline-Catalyzed Enantioselective Oxidative Cyclization of Aromatic Alkenyl Amides. European J Org Chem 2019. [DOI: 10.1002/ejoc.201900431] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Affiliation(s)
- Qinqin Tian
- Department of Chemistry; School of Pharmacy; The Fourth Military Medical University; 710032 Xi'an People's Republic of China
| | - Yulong Liu
- Department of Chemistry; School of Pharmacy; The Fourth Military Medical University; 710032 Xi'an People's Republic of China
| | - Xiaoyun Wang
- Department of Chemistry; School of Pharmacy; The Fourth Military Medical University; 710032 Xi'an People's Republic of China
| | - Xie Wang
- Department of Chemistry; School of Pharmacy; The Fourth Military Medical University; 710032 Xi'an People's Republic of China
| | - Wei He
- Department of Chemistry; School of Pharmacy; The Fourth Military Medical University; 710032 Xi'an People's Republic of China
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Kumar A, Yuan D, Huynh HV. Stereoelectronic Profiling of Expanded-Ring N-Heterocyclic Carbenes. Inorg Chem 2019; 58:7545-7553. [PMID: 31074971 DOI: 10.1021/acs.inorgchem.9b00786] [Citation(s) in RCA: 28] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Heterobis(carbene) complexes of palladium(II) and gold(I) containing expanded-ring N-heterocyclic carbenes (erNHCs) have been prepared in order to study their electronic properties. erNHCs with mesityl substituents were found to exhibit anisotropic interferences, which hampered ranking of their donicities by 13C NMR spectroscopy. The anisotropy effects were found to be stronger in the linear gold complexes, where a smaller coordination number allows the wingtips to spread out more. erNHCs with flexible N-benzyl groups are more suitable, and their donor strengths were found to gradually increase from five- to seven-membered heterocycles. The same trend can also be obtained by comparing the 1 J(C-H) coupling constants of the respective salts, although significant differences between seven- and eight-membered erNHCs could not be detected. The % Vbur values of erNHCs obtained from structures of their palladium and gold complexes revealed that the anisotropic interferences increase with overall steric bulk.
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Affiliation(s)
- Anuj Kumar
- Department of Chemistry , National University of Singapore , 3 Science Drive 3 , Singapore 117543
| | - Dan Yuan
- Key Laboratory of Organic Synthesis of Jiangsu Province, College of Chemistry, Chemical Engineering and Materials Science, Dushu Lake Campus , Soochow University , Suzhou 215123 , People's Republic of China
| | - Han Vinh Huynh
- Department of Chemistry , National University of Singapore , 3 Science Drive 3 , Singapore 117543
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Cationic versus anionic Pt complex: The performance analysis of a hybrid-capacitor, DFT calculation and electrochemical properties. Polyhedron 2019. [DOI: 10.1016/j.poly.2018.10.033] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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Kaur N. Applications of palladium dibenzylideneacetone as catalyst in the synthesis of five-membered N-heterocycles. SYNTHETIC COMMUN 2018. [DOI: 10.1080/00397911.2018.1540048] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Affiliation(s)
- Navjeet Kaur
- Department of Chemistry, Banasthali Vidyapith, Banasthali, Rajasthan, India
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Sen A, Takenaka K, Sasai H. Enantioselective Aza-Wacker-Type Cyclization Promoted by Pd-SPRIX Catalyst. Org Lett 2018; 20:6827-6831. [DOI: 10.1021/acs.orglett.8b02946] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Affiliation(s)
- Abhijit Sen
- The Institute of Scientific and Industrial Research, Osaka University, 8-1 Mihogaoka, Ibaraki-shi, Osaka 567-0047, Japan
| | - Kazuhiro Takenaka
- The Institute of Scientific and Industrial Research, Osaka University, 8-1 Mihogaoka, Ibaraki-shi, Osaka 567-0047, Japan
| | - Hiroaki Sasai
- The Institute of Scientific and Industrial Research, Osaka University, 8-1 Mihogaoka, Ibaraki-shi, Osaka 567-0047, Japan
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Kou X, Shao Q, Ye C, Yang G, Zhang W. Asymmetric Aza-Wacker-Type Cyclization of N-Ts Hydrazine-Tethered Tetrasubstituted Olefins: Synthesis of Pyrazolines Bearing One Quaternary or Two Vicinal Stereocenters. J Am Chem Soc 2018; 140:7587-7597. [PMID: 29804449 DOI: 10.1021/jacs.8b02865] [Citation(s) in RCA: 65] [Impact Index Per Article: 10.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
We have developed an asymmetric aza-Wacker-type cyclization of N-Ts hydrazine-tethered tetrasubstituted olefins, affording optically active pyrazolines bearing chiral tetrasubstituted carbon stereocenters. This reaction is tolerant to a broad range of substrates under mild reaction conditions, giving the desired chiral products with high enantioselectivities. Generation of two vicinal stereocenters on the C═C double bonds was also achieved with high selectivities, a process which has been rarely studied for Wacker-type reactions. A mechanistic study revealed that this aza-Wacker-type cyclization undergoes a syn-aminopalladation process. It was also found that for substrates bearing two linear alkyl substituents on the outer carbon atom of the olefin, both of which are larger than a methyl group, the alkyl substituent that is cis to the intranucleophilic group participates more readily in β-hydride elimination. When one of the two alkyl substituents on the outer carbon atom of the olefin is a methyl group, β-hydride elimination proceeds selectively at the methylene side, thus both diastereomers can be prepared via switching the configuration of the olefin. Furthermore, the product can be converted to a pharmaceutical compound in high yields over three steps.
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Affiliation(s)
- Xuezhen Kou
- Shanghai Key Laboratory for Molecular Engineering of Chiral Drugs, School of Chemistry and Chemical Engineering , Shanghai Jiao Tong University , 800 Dongchuan Road , Shanghai 200240 , P. R. China
| | - Qihang Shao
- Shanghai Key Laboratory for Molecular Engineering of Chiral Drugs, School of Chemistry and Chemical Engineering , Shanghai Jiao Tong University , 800 Dongchuan Road , Shanghai 200240 , P. R. China
| | - Chenghao Ye
- Shanghai Key Laboratory for Molecular Engineering of Chiral Drugs, School of Chemistry and Chemical Engineering , Shanghai Jiao Tong University , 800 Dongchuan Road , Shanghai 200240 , P. R. China
| | - Guoqiang Yang
- Shanghai Key Laboratory for Molecular Engineering of Chiral Drugs, School of Chemistry and Chemical Engineering , Shanghai Jiao Tong University , 800 Dongchuan Road , Shanghai 200240 , P. R. China
| | - Wanbin Zhang
- Shanghai Key Laboratory for Molecular Engineering of Chiral Drugs, School of Chemistry and Chemical Engineering , Shanghai Jiao Tong University , 800 Dongchuan Road , Shanghai 200240 , P. R. China
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Yang G, Zhang W. Renaissance of pyridine-oxazolines as chiral ligands for asymmetric catalysis. Chem Soc Rev 2018; 47:1783-1810. [PMID: 29469141 DOI: 10.1039/c7cs00615b] [Citation(s) in RCA: 154] [Impact Index Per Article: 25.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
Oxazoline-containing ligands have been widely employed in numerous asymmetric catalytic reactions. Pyridine-oxazoline-type ligands, a class of hybrid ligands, were designed earlier than bisoxazoline and phosphine-oxazoline ligands; however, their unique properties have only been discovered recently. Pyridine-oxazoline-type chiral ligands are rapidly becoming popular for use in asymmetric catalysis, especially for several new and efficient asymmetric methodologies. Several types of challenging asymmetric reactions have been discovered recently using pyridine-oxazoline-type ligands showing their special properties and potential for future application in a wide range of new catalytic methodologies. This review provides an overview of this field, with the aim of highlighting both ligand design and synthetic methodology development.
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Affiliation(s)
- Guoqiang Yang
- Shanghai Key Laboratory for Molecular Engineering of Chiral Drugs, School of Chemistry and Chemical Engineering, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai 200240, China.
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Rauf W, Brown JM. Mechanisms for C(sp 2)-Si activation of aryltrimethylsilyl groups in palladium-catalysed couplings. Org Biomol Chem 2017; 15:8179-8185. [PMID: 28926074 DOI: 10.1039/c7ob01675a] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Silyl-substituted aromatic compounds can participate as the electrophilic component in palladium-catalysed cross-couplings, and reactivity is enhanced by a neighbouring silyl-group. Products analogous to those obtained from C-H activation chemistry are accessible by this means with the additional benefit of regiochemistry defined by the site of silyl substitution. DFT studies described here show that the mechanism of C-Si cleavage is distinct from previously recognised mechanisms for C-H cleavage, with a cascade of silyl intermediates en route to a stable product. The amide directing-groups are involved only in the stabilisation of palladacyclic intermediates, and are never disposed to activate silicon directly. 5-Membered and 6-membered palladacycles are known to behave differently in coupling reactions and the calculations reveal underlying reasons in the cationic pathways studied here.
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Affiliation(s)
- Waqar Rauf
- Health Biotechnology Division, NIBGE, Faisalabad, Pakistan.
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Wang D, Weinstein AB, White PB, Stahl SS. Ligand-Promoted Palladium-Catalyzed Aerobic Oxidation Reactions. Chem Rev 2017; 118:2636-2679. [PMID: 28975795 DOI: 10.1021/acs.chemrev.7b00334] [Citation(s) in RCA: 378] [Impact Index Per Article: 54.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Palladium-catalyzed aerobic oxidation reactions have been the focus of industrial application and extensive research efforts for nearly 60 years. A significant transition occurred in this field approximately 20 years ago, with the introduction of catalysts supported by ancillary ligands. The ligands play crucial roles in the reactions, including promotion of direct oxidation of palladium(0) by O2, bypassing the typical requirement for Cu salts or related redox cocatalysts to facilitate oxidation of the reduced Pd catalyst; facilitation of key bond-breaking and bond-forming steps during substrate oxidation; and modulation of chemo-, regio-, or stereoselectivity of a reaction. The use of ligands has contributed to significant expansion of the scope of accessible aerobic oxidation reactions. Increased understanding of the role of ancillary ligands should promote the development of new synthetic transformations, enable improved control over the reaction selectivity, and improve catalyst activity and stability. This review surveys the different ligands that have been used to support palladium-catalyzed aerobic oxidation reactions and, where possible, describes mechanistic insights into the role played by the ancillary ligand.
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Affiliation(s)
- Dian Wang
- Department of Chemistry , University of Wisconsin-Madison , 1101 University Avenue , Madison , Wisconsin 53706 , United States
| | - Adam B Weinstein
- Department of Chemistry , University of Wisconsin-Madison , 1101 University Avenue , Madison , Wisconsin 53706 , United States
| | - Paul B White
- Department of Chemistry , University of Wisconsin-Madison , 1101 University Avenue , Madison , Wisconsin 53706 , United States
| | - Shannon S Stahl
- Department of Chemistry , University of Wisconsin-Madison , 1101 University Avenue , Madison , Wisconsin 53706 , United States
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Aebly AH, Rainey TJ. Pd(II)-catalyzed enantioselective intramolecular oxidative amination utilizing (+)-camphorsulfonic acid. Tetrahedron Lett 2017. [DOI: 10.1016/j.tetlet.2017.07.090] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Ye L, Lo KY, Gu Q, Yang D. Pd-Catalyzed Intramolecular Aminoalkylation of Unactivated Alkenes: Access to Diverse N-Heterocycles. Org Lett 2017; 19:308-311. [PMID: 28045266 DOI: 10.1021/acs.orglett.6b03295] [Citation(s) in RCA: 31] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
A highly efficient palladium-catalyzed intramolecular aminoalkylation of unactivated alkenes in the absence of an external ligand and oxidant is described. New C-N and C(sp3)-C(sp3) bonds are formed simultaneously. This general transformation allows for construction of diverse N-heterocycles. Mechanistic studies show that the process may involve a four-membered Pd(alkyl)amido intermediate.
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Affiliation(s)
- Liu Ye
- Department of Chemistry, The University of Hong Kong , Pokfulam Road, Hong Kong, P. R. China
| | - Kai-Yip Lo
- Department of Chemistry, The University of Hong Kong , Pokfulam Road, Hong Kong, P. R. China
| | - Qiangshuai Gu
- Department of Chemistry, The University of Hong Kong , Pokfulam Road, Hong Kong, P. R. China
| | - Dan Yang
- Department of Chemistry, The University of Hong Kong , Pokfulam Road, Hong Kong, P. R. China
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Pérez-Briso C, Gallego AM, Martín-Alvarez JM, Martínez-Ilarduya JM, Espinet P. Polymer [Pd(CH2SO2C6H4Me)2]n, a precursor to remarkably stable Pd organometallics. Dalton Trans 2017; 46:8083-8090. [DOI: 10.1039/c7dt00904f] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Stable (arylsulfonyl)alkylpalladium complexes obtained from the polymer [Pd(CH2SO2C6H4Me)2]n undergo cis-to-trans isomerization in order to produce systems with stronger hydrogen bonds.
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Affiliation(s)
- Celeste Pérez-Briso
- IU CINQUIMA/Química Inorgánica
- Facultad de Ciencias
- Universidad de Valladolid
- 47071 Valladolid
- Spain
| | - Ana M. Gallego
- IU CINQUIMA/Química Inorgánica
- Facultad de Ciencias
- Universidad de Valladolid
- 47071 Valladolid
- Spain
| | - Jose M. Martín-Alvarez
- IU CINQUIMA/Química Inorgánica
- Facultad de Ciencias
- Universidad de Valladolid
- 47071 Valladolid
- Spain
| | | | - Pablo Espinet
- IU CINQUIMA/Química Inorgánica
- Facultad de Ciencias
- Universidad de Valladolid
- 47071 Valladolid
- Spain
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Liu X, Wang Z, Fu X. Light induced catalytic intramolecular hydrofunctionalization of allylphenols mediated by porphyrin rhodium(iii) complexes. Dalton Trans 2016; 45:13308-10. [PMID: 27482840 DOI: 10.1039/c6dt01653g] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Catalytic intramolecular hydrofunctionalization of allylphenols to heterocyclic compounds mediated by rhodium(iii) porphyrin complexes was described. The Wacker-type intermediate β-heterocyclic alkyl rhodium complex was independently synthesized and crystallized.
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Affiliation(s)
- Xu Liu
- Beijing National Laboratory for Molecular Sciences, State Key Lab of Rare EarthMaterials Chemistry and Applications, College of Chemistry and Molecular Engineering, Peking University, Beijing, China.
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Vellakkaran M, Andappan MMS, Nagaiah K, Nanubolu JB. Direct Synthesis of γ-Keto Sulfones from Allylic Alcohols: One-Pot Palladium(II)-Catalyzed Generation of Enones Followed by Water-Mediated 1,4-Addition of Organosulfinates. European J Org Chem 2016. [DOI: 10.1002/ejoc.201600494] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Affiliation(s)
- Mari Vellakkaran
- Organic and Biomolecular Chemistry Division; CSIR - Indian Institute of Chemical Technology; Tarnaka 500007 Hyderabad India
| | | | - Kommu Nagaiah
- Organic and Biomolecular Chemistry Division; CSIR - Indian Institute of Chemical Technology; Tarnaka 500007 Hyderabad India
| | - Jagadeesh Babu Nanubolu
- Lab of X-ray Crystallography; CSIR-Indian Institute of Chemical Technology; 500 007 Hyderabad India
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Yang L, Zhang W, Xiao Y, Mao P. Picolyl Functionalised ChelatingN-Heterocyclic Carbene Palladium Complexes: Synthesis and Catalytic Activity towards Suzuki Cross-coupling in Water. ChemistrySelect 2016. [DOI: 10.1002/slct.201600069] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Affiliation(s)
- Liangru Yang
- School of Chemistry and Chemical Engineering; Henan University of Technology; Zhengzhou 450001 P. R. China
- Academician Workstation for Natural Medicinal; Chemistry of Henan Province; Zhengzhou 450001 P. R. China
| | - Wenjun Zhang
- School of Chemistry and Chemical Engineering; Henan University of Technology; Zhengzhou 450001 P. R. China
- Academician Workstation for Natural Medicinal; Chemistry of Henan Province; Zhengzhou 450001 P. R. China
| | - Yongmei Xiao
- School of Chemistry and Chemical Engineering; Henan University of Technology; Zhengzhou 450001 P. R. China
- Academician Workstation for Natural Medicinal; Chemistry of Henan Province; Zhengzhou 450001 P. R. China
| | - Pu Mao
- School of Chemistry and Chemical Engineering; Henan University of Technology; Zhengzhou 450001 P. R. China
- Academician Workstation for Natural Medicinal; Chemistry of Henan Province; Zhengzhou 450001 P. R. China
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Kim KW, Kim YJ, Lim HJ, Lee SW. Pd(II) Trifluoroacetate Complexes Containing Chelating Phosphine Ligands: Synthesis, Structures, and Catalysis. B KOREAN CHEM SOC 2015. [DOI: 10.1002/bkcs.10590] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
Affiliation(s)
- Kun-Woo Kim
- Department of Chemistry; Kangnung-Wonju National University; Gangneung 210-702 Korea
| | - Yong-Joo Kim
- Department of Chemistry; Kangnung-Wonju National University; Gangneung 210-702 Korea
| | - Hye Jin Lim
- Department of Chemistry; Sungkyunkwan University; Suwon 440-746 Korea
| | - Soon W. Lee
- Department of Chemistry; Sungkyunkwan University; Suwon 440-746 Korea
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Huang L, Cao Y, Zhao M, Tang Z, Sun Z. Asymmetric borylation of α,β-unsaturated esters catalyzed by novel ring expanded N-heterocyclic carbenes based on chiral 3,4-dihydro-quinazolinium compounds. Org Biomol Chem 2015; 12:6554-6. [PMID: 25048012 DOI: 10.1039/c4ob01101e] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
A series of chiral 6-membered ring N-heterocyclic carbene (NHC) precursors based on 3,4-dihydro-quinazoline were synthesized with overall yields of 54-62%. NHCs generated from these precursors show excellent asymmetric catalytic properties for borylation of α,β-unsaturated esters with enantioselectivity of up to 93% with a catalyst content of only 1 mol%.
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Affiliation(s)
- Liliang Huang
- College of Chemistry and Chemical Engineering, Shanghai University of Engineering Science, 333 Longteng Road, Shanghai, China.
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Novel C2-symmetric six-membered NHCs for asymmetric copper-catalysed conjugate addition of Grignard reagents to 3-methylhexenone. Tetrahedron 2015. [DOI: 10.1016/j.tet.2015.03.067] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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Yang P, Xiang Y, Lin Z, Bassil BS, Cao J, Fan L, Fan Y, Li MX, Jiménez-Lozano P, Carbó JJ, Poblet JM, Kortz U. Alkaline earth guests in polyoxopalladate chemistry: from nanocube to nanostar via an open-shell structure. Angew Chem Int Ed Engl 2014; 53:11974-8. [PMID: 25220307 DOI: 10.1002/anie.201407090] [Citation(s) in RCA: 50] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/10/2014] [Indexed: 11/05/2022]
Abstract
The three novel, discrete palladium(II)-oxo clusters [CaPd12O8(PhAsO3)8](6-) (CaPd12), [SrPd12O6(OH)3(PhAsO3)6(OAc)3](4-) (SrPd12), and [BaPd15O10(PhAsO3)10](8-) (BaPd15) encapsulating alkaline earth metal ions were prepared and fully characterized by a multitude of solution and solid-state physicochemical techniques. We have discovered a structure-directing template effect induced by the respective size of the alkaline earth guest ion, which determines the detailed condensation arrangement of the peripheral Pd(II)-oxo shell. The unprecedented SrPd12 with an open-shell type structure is of particular importance and reflects a successful strategy for deliberate design of new structural classes of polyoxo-noble-metalates. Furthermore, the unusual acetate-water ligand exchange phenomenon renders SrPd12 as a promising candidate for noble-metal-based catalysis.
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Affiliation(s)
- Peng Yang
- Jacobs University, School of Engineering and Science, P.O. Box 750561, 28725 Bremen (Germany) http://www.jacobs-university.de/ses/ukortz
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Yang P, Xiang Y, Lin Z, Bassil BS, Cao J, Fan L, Fan Y, Li MX, Jiménez-Lozano P, Carbó JJ, Poblet JM, Kortz U. Erdalkalimetalle als Gastionen in der Polyoxopalladatchemie: vom Nanowürfel über eine offenschalige Struktur zum Nanostern. Angew Chem Int Ed Engl 2014. [DOI: 10.1002/ange.201407090] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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Sirvent JA, Foubelo F, Yus M. Stereoselective synthesis of indoline, tetrahydroquinoline, and tetrahydrobenzazepine derivatives from o-bromophenyl N-tert-butylsulfinyl aldimines. J Org Chem 2014; 79:1356-67. [PMID: 24447196 DOI: 10.1021/jo402759v] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
The diastereoselective addition of an allylic indium intermediate to chiral o-bromophenyl sulfinyl imine 4 proceeded with good levels of diastereoselectivity. The resulting homoallylic amine derivatives were transformed into lactams 7 and 12, which upon copper-mediated intramolecular N-arylation led to the formation of benzo-fused 1-azabicyclo[j.k.0]alkanes 8 and 13. Benzo-fused 2-allyl-substituted heterocycles 14 could also be prepared by means of a palladium-catalyzed N-arylation of the corresponding free amines. The synthesis of the alkaloid (−)-angustureine was easily accomplished from (S)-2-allyltetrahydroquinoline (14b).
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28
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Collins LR, Rookes TM, Mahon MF, Riddlestone IM, Whittlesey MK. Use of Ring-Expanded Diamino- and Diamidocarbene Ligands in Copper Catalyzed Azide–Alkyne “Click” Reactions. Organometallics 2014. [DOI: 10.1021/om5004732] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
Affiliation(s)
- Lee R. Collins
- Department
of Chemistry, University of Bath, Claverton Down, Bath BA2
7AY, U.K
| | - Thomas M. Rookes
- Department
of Chemistry, University of Bath, Claverton Down, Bath BA2
7AY, U.K
| | - Mary F. Mahon
- Department
of Chemistry, University of Bath, Claverton Down, Bath BA2
7AY, U.K
| | - Ian M. Riddlestone
- Department
of Chemistry, University of Bath, Claverton Down, Bath BA2
7AY, U.K
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29
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Dunsford JJ, Tromp DS, Cavell KJ, Elsevier CJ, Kariuki BM. N-alkyl functionalised expanded ring N-heterocyclic carbene complexes of rhodium(I) and iridium(I): structural investigations and preliminary catalytic evaluation. Dalton Trans 2014; 42:7318-29. [PMID: 23292451 DOI: 10.1039/c2dt32823b] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A series of new N-alkyl functionalised 6- and 7-membered expanded ring N-heterocyclic carbene (NHC) pro-ligands 3-6 and their corresponding complexes of rhodium(I) and iridium(I), [M(NHC)(COD)Cl] 7-14 and [M(NHC)(CO)2Cl] 15-22 are described. The complexes have been characterised by (1)H and (13)C{(1)H} NMR, mass spectrometry, IR and X-ray diffraction. It is noted from X-ray diffraction studies that the N-alkyl substituents are found to orientate themselves away from the metal centre due to unfavourable steric interactions resulting in low percent buried volume (%V(bur)) values in the solid state. The heterocycle ring size is also found to dictate the spatial orientation of the N-alkyl substituents in the neopentyl functionalised derivatives 10 and 14. The 7-membered derivative 14 allows for a conformational 'twist' of the heterocycle ring with the N-alkyl substituents adopting a mutually trans configuration with respect to each other, while the more rigid 6-membered system 10 does not allow for this conformational 'twist' and consequently the N-alkyl substituents adopt a mutually cis configuration. The σ-donor function of this new class of expanded ring NHC ligand has also been probed by measured IR stretching frequencies of the [M(NHC)(CO)2Cl] complexes 15-22. A preliminary catalytic survey of the hydrogenation of functionalised alkenes with molecular hydrogen under mild conditions has also been undertaken with complex , affording an insight into the application of large ring NHC ancillary ligands bearing N-alkyl substituents in hydrogenation transformations.
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Affiliation(s)
- Jay J Dunsford
- School of Chemistry, Main Building, Cardiff University, Cardiff, CF10 3AT Wales, UK
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30
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Musgrave RA, Turbervill RSP, Irwin M, Herchel R, Goicoechea JM. Iron(ii) complexes of ditopic carbanionic carbenes. Dalton Trans 2014; 43:4335-44. [DOI: 10.1039/c3dt52638k] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
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31
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He YP, Wu H, Xu L, Su YL, Gong LZ. Highly enantioselective oxidative tandem cyclization reaction: a chiral ligand and an anion cooperatively control stereoselectivity. Org Chem Front 2014. [DOI: 10.1039/c4qo00042k] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The unprecedented combination of a palladium(ii) complex with a chiral Bu-QUOX ligand and a chiral phosphoric acid enables the highly efficient asymmetric oxidative tandem cyclization reaction, providing a straightforward method to access chiral 6,5-bicyclic aza-heterocycles in moderate to good yields and with excellent enantioselectivities.
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Affiliation(s)
- Yu-Ping He
- Hefei National Laboratory for Physical Sciences at the Microscale and Department of Chemistry
- University of Science and Technology of China
- Hefei, China
| | - Hua Wu
- Hefei National Laboratory for Physical Sciences at the Microscale and Department of Chemistry
- University of Science and Technology of China
- Hefei, China
| | - Lue Xu
- Hefei National Laboratory for Physical Sciences at the Microscale and Department of Chemistry
- University of Science and Technology of China
- Hefei, China
| | - Yong-Liang Su
- Hefei National Laboratory for Physical Sciences at the Microscale and Department of Chemistry
- University of Science and Technology of China
- Hefei, China
| | - Liu-Zhu Gong
- Hefei National Laboratory for Physical Sciences at the Microscale and Department of Chemistry
- University of Science and Technology of China
- Hefei, China
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32
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Palladium-Catalyzed Intermolecular Oxidative Amination of Alkenes with Amines, Using Molecular Oxygen as Terminal Oxidant. Catalysts 2013. [DOI: 10.3390/catal3040794] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
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33
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Ye X, White PB, Stahl SS. Mechanistic studies of Wacker-type amidocyclization of alkenes catalyzed by (IMes)Pd(TFA)2(H2O): kinetic and stereochemical implications of proton transfer. J Org Chem 2013; 78:2083-90. [PMID: 23157332 PMCID: PMC3586306 DOI: 10.1021/jo302266t] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The stereochemical course of the amidopalladation of alkenes has important implications for the development of enantioselective Pd-catalyzed "Wacker-type" oxidative amidation of alkenes. We have recently shown that the addition of base (Na2CO3) can alter the stereochemical course of amidopalladation in the (IMes)Pd(TFA)2(H2O)-catalyzed aerobic oxidative amidation of alkene. In this study, the mechanism of (IMes)Pd(TFA)2(H2O)-catalyzed oxidative heterocyclization of (Z)-4-hexenyltosylamide was investigated in the presence and absence of exogenous base Na2CO3. The results reveal two parallel pathways in the absence of base: a cis-amidopalladation pathway with turnover-limiting deprotonation of the sulfonamide nucleophile and a trans-amidopalladation pathway with turnover-limiting nucleophilic attack of sulfonamide on the coordinated alkene. The addition of base (Na2CO3) lowers the energy barrier associated with the proton transfer, leading to an overall faster turnover rate and exclusive cis-amidopalladation of alkene.
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Affiliation(s)
- Xuan Ye
- Department of Chemistry, University of Wisconsin-Madison, 1101 University Avenue, Madison, Wisconsin 53706
| | - Paul B. White
- Department of Chemistry, University of Wisconsin-Madison, 1101 University Avenue, Madison, Wisconsin 53706
| | - Shannon S. Stahl
- Department of Chemistry, University of Wisconsin-Madison, 1101 University Avenue, Madison, Wisconsin 53706
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34
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Hauwert P, Dunsford JJ, Tromp DS, Weigand JJ, Lutz M, Cavell KJ, Elsevier CJ. Zerovalent [Pd(NHC)(Alkene)1,2] Complexes Bearing Expanded-Ring N-Heterocyclic Carbene Ligands in Transfer Hydrogenation of Alkynes. Organometallics 2012. [DOI: 10.1021/om300930w] [Citation(s) in RCA: 50] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Affiliation(s)
- Peter Hauwert
- Molecular Inorganic Chemistry, Van’t Hoff Institute
for Molecular Sciences, University of Amsterdam, Science Park 904, Postbus 94157, 1090 GD Amsterdam, The Netherlands
| | - Jay J. Dunsford
- School of Chemistry, Cardiff University, Main Building, Park Place, Cardiff CF10 3AT, United Kingdom
| | - Dorette S. Tromp
- Molecular Inorganic Chemistry, Van’t Hoff Institute
for Molecular Sciences, University of Amsterdam, Science Park 904, Postbus 94157, 1090 GD Amsterdam, The Netherlands
| | - Jan J. Weigand
- Institut für Anorganische und Analytische Chemie, Westfälische Wilhelms-Universität Münster, Corrensstrasse 30, 48149 Münster, Germany
| | - Martin Lutz
- Crystal
and Structural Chemistry, Bijvoet Center for Biomolecular
Research, Faculty of Science, Utrecht University, Padualaan 8, 3584 CH Utrecht, The Netherlands
| | - Kingsley J. Cavell
- School of Chemistry, Cardiff University, Main Building, Park Place, Cardiff CF10 3AT, United Kingdom
| | - Cornelis J. Elsevier
- Molecular Inorganic Chemistry, Van’t Hoff Institute
for Molecular Sciences, University of Amsterdam, Science Park 904, Postbus 94157, 1090 GD Amsterdam, The Netherlands
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35
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Weinstein AB, Stahl SS. Reconciling the stereochemical course of nucleopalladation with the development of enantioselective wacker-type cyclizations. Angew Chem Int Ed Engl 2012; 51:11505-9. [PMID: 23074039 DOI: 10.1002/anie.201206702] [Citation(s) in RCA: 81] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/18/2012] [Indexed: 11/07/2022]
Affiliation(s)
- Adam B Weinstein
- Department of Chemistry, University of Wisconsin-Madison, 1101 University Avenue, Madison, WI 53706, USA
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36
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Weinstein AB, Stahl SS. Reconciling the Stereochemical Course of Nucleopalladation with the Development of Enantioselective Wacker-Type Cyclizations. Angew Chem Int Ed Engl 2012. [DOI: 10.1002/ange.201206702] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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37
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Yang G, Shen C, Zhang W. An Asymmetric Aerobic Aza-Wacker-Type Cyclization: Synthesis of Isoindolinones Bearing Tetrasubstituted Carbon Stereocenters. Angew Chem Int Ed Engl 2012. [DOI: 10.1002/ange.201203693] [Citation(s) in RCA: 40] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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38
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Yang G, Shen C, Zhang W. An Asymmetric Aerobic Aza-Wacker-Type Cyclization: Synthesis of Isoindolinones Bearing Tetrasubstituted Carbon Stereocenters. Angew Chem Int Ed Engl 2012; 51:9141-5. [DOI: 10.1002/anie.201203693] [Citation(s) in RCA: 142] [Impact Index Per Article: 11.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/12/2012] [Revised: 07/09/2012] [Indexed: 11/10/2022]
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39
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40
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Kawabata S, Tokura H, Chiyojima H, Okamoto M, Sakaguchi S. Asymmetric Hydrosilane Reduction of Ketones Catalyzed by an Iridium Complex Bearing a Hydroxyamide-Functionalized NHC Ligand. Adv Synth Catal 2012. [DOI: 10.1002/adsc.201100897] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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41
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Redford JE, McDonald RI, Rigsby ML, Wiensch JD, Stahl SS. Stereoselective synthesis of cis-2,5-disubstituted pyrrolidines via Wacker-type aerobic oxidative cyclization of alkenes with tert-butanesulfinamide nucleophiles. Org Lett 2012; 14:1242-5. [PMID: 22352383 DOI: 10.1021/ol3000519] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Abstract
Palladium(II)-catalyzed aerobic oxidative cyclization of alkenes with tethered tert-butanesulfinamides furnishes enantiopure 2,5-disubstituted pyrrolidines, originating from readily available and easily diversified starting materials. These reactions are the first reported examples of metal-catalyzed addition of sulfinamide nucleophiles to alkenes.
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Affiliation(s)
- Joanne E Redford
- University of Wisconsin-Madison, 1101 University Avenue, Madison, Wisconsin 53706, USA
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42
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Banerjee D, Besnard C, Kündig EP. Chiral N-Heterocyclic Carbene Borane Complexes: Synthesis and Structural Analysis. Organometallics 2012. [DOI: 10.1021/om201087n] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Affiliation(s)
- Dipshikha Banerjee
- Department of Organic Chemistry, University of Geneva, 30 Quai Ernest Ansermet, 1211
Geneva 4, Switzerland
| | - Céline Besnard
- Department of Organic Chemistry, University of Geneva, 30 Quai Ernest Ansermet, 1211
Geneva 4, Switzerland
| | - E. Peter Kündig
- Department of Organic Chemistry, University of Geneva, 30 Quai Ernest Ansermet, 1211
Geneva 4, Switzerland
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43
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Shi Z, Zhang C, Tang C, Jiao N. Recent advances in transition-metal catalyzed reactions using molecular oxygen as the oxidant. Chem Soc Rev 2012; 41:3381-430. [DOI: 10.1039/c2cs15224j] [Citation(s) in RCA: 1033] [Impact Index Per Article: 86.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
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44
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Yang G, Zhang W. Regioselective Pd-Catalyzed Aerobic Aza-Wacker Cyclization for Preparation of Isoindolinones and Isoquinolin-1(2H)-ones. Org Lett 2011; 14:268-71. [DOI: 10.1021/ol203043h] [Citation(s) in RCA: 72] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Affiliation(s)
- Guoqiang Yang
- School of Chemistry and Chemical Engineering, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai 200240, P. R. China
| | - Wanbin Zhang
- School of Chemistry and Chemical Engineering, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai 200240, P. R. China
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45
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White PB, Stahl SS. Reversible alkene insertion into the Pd-N bond of Pd(II)-sulfonamidates and implications for catalytic amidation reactions. J Am Chem Soc 2011; 133:18594-7. [PMID: 22007610 DOI: 10.1021/ja208560h] [Citation(s) in RCA: 75] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Alkene insertion into Pd-N bonds is a key step in Pd-catalyzed oxidative amidation of alkenes. A series of well-defined Pd(II)-sulfonamidate complexes have been prepared and shown to react via insertion of a tethered alkene. The Pd-amidate and resulting Pd-alkyl species have been crystallographically characterized. The alkene insertion reaction is found to be reversible, but complete conversion to oxidative amination products is observed in the presence of O(2). Electronic-effect studies reveal that alkene insertion into the Pd-N bond is favored kinetically and thermodynamically with electron-rich amidates.
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Affiliation(s)
- Paul B White
- Department of Chemistry, University of Wisconsin-Madison, 1101 University Avenue, Madison, Wisconsin 53706, USA
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46
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Peng KF, Chen CT. Synthesis, Structural Studies, and Catalytic Application of Palladium Complexes Containing Anilido-Oxazolinate Ligands. Eur J Inorg Chem 2011. [DOI: 10.1002/ejic.201100743] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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47
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Lu WY, Cavell KJ, Wixey JS, Kariuki B. First Examples of Structurally Imposing Eight-Membered-Ring (Diazocanylidene) N-Heterocyclic Carbenes: Salts, Free Carbenes, and Metal Complexes. Organometallics 2011. [DOI: 10.1021/om200467x] [Citation(s) in RCA: 64] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Wei Y. Lu
- School of Chemistry, Cardiff University, Main Building, Park Place, Cardiff CF10 3AT, U.K
| | - Kingsley J. Cavell
- School of Chemistry, Cardiff University, Main Building, Park Place, Cardiff CF10 3AT, U.K
| | - James S. Wixey
- School of Chemistry, Cardiff University, Main Building, Park Place, Cardiff CF10 3AT, U.K
| | - Benson Kariuki
- School of Chemistry, Cardiff University, Main Building, Park Place, Cardiff CF10 3AT, U.K
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48
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Dunsford JJ, Cavell KJ. Expanded ring N-heterocyclic carbenes: a comparative study of ring size in palladium (0) catalysed Mizoroki-Heck coupling. Dalton Trans 2011; 40:9131-5. [PMID: 21818498 DOI: 10.1039/c1dt10596e] [Citation(s) in RCA: 43] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The synthesis and characterisation of a range of new 6- and 7-membered expanded ring N-heterocyclic carbene (NHC) complexes of zero valent palladium dvtms (divinyltetramethyldisiloxane) 8-14 is reported, with the first comparative catalytic study probing the effects of large ring N-heterocyclic carbene ligands (6-Mes and 7-Mes) with their analogous 5-membered derivative (IMes) on catalytic performance. The catalytic performances of the [Pd(NHC)(dvtms)] complexes are evaluated in the Mizoroki-Heck coupling of 4-bromoacetophenone and n-butyl acrylate, providing a ready and effective comparison into the influence of ring size and steric congestion on catalytic activity in carbon-carbon cross coupling reactions.
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Affiliation(s)
- Jay J Dunsford
- School of Chemistry, Main Building, Cardiff University, Cardiff, UK CF10 3AT
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49
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Nakanishi M, Katayev D, Besnard C, Kündig EP. Fused Indolines by Palladium-Catalyzed Asymmetric CC Coupling Involving an Unactivated Methylene Group. Angew Chem Int Ed Engl 2011; 50:7438-41. [DOI: 10.1002/anie.201102639] [Citation(s) in RCA: 276] [Impact Index Per Article: 21.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/16/2011] [Indexed: 11/11/2022]
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50
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Nakanishi M, Katayev D, Besnard C, Kündig EP. Fused Indolines by Palladium-Catalyzed Asymmetric CC Coupling Involving an Unactivated Methylene Group. Angew Chem Int Ed Engl 2011. [DOI: 10.1002/ange.201102639] [Citation(s) in RCA: 121] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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