1
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Zhao JH, Zheng L, Zou JY, Zhang SY, Shen HC, Wu Y, Wang P. Construction of Si-Stereogenic Silanols by Palladium-Catalyzed Enantioselective C-H Alkenylation. Angew Chem Int Ed Engl 2024; 63:e202402612. [PMID: 38410071 DOI: 10.1002/anie.202402612] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/05/2024] [Revised: 02/26/2024] [Accepted: 02/26/2024] [Indexed: 02/28/2024]
Abstract
The construction of silicon-stereogenic silanols via Pd-catalyzed intermolecular C-H alkenylation with the assistance of a commercially available L-pyroglutamic acid has been realized for the first time. Employing oxime ether as the directing group, silicon-stereogenic silanol derivatives could be readily prepared with excellent enantioselectivities, featuring a broad substrate scope and good functional group tolerance. Moreover, parallel kinetic resolution with unsymmetric substrates further highlighted the generality of this protocol. Mechanistic studies indicate that L-pyroglutamic acid could stabilize the Pd catalyst and provide excellent chiral induction. Preliminary computational studies unveil the origin of the enantioselectivity in the C-H bond activation step.
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Affiliation(s)
- Jia-Hui Zhao
- State Key Laboratory of Organometallic Chemistry, Shanghai Institute of Organic Chemistry, University of Chinese Academy of Sciences, CAS, 345 Lingling Road, Shanghai, 200032, China
- School of Physical Science and Technology, ShanghaiTech University, Shanghai, 201210, China
| | - Long Zheng
- State Key Laboratory of Organometallic Chemistry, Shanghai Institute of Organic Chemistry, University of Chinese Academy of Sciences, CAS, 345 Lingling Road, Shanghai, 200032, China
| | - Jian-Ye Zou
- State Key Laboratory of Organometallic Chemistry, Shanghai Institute of Organic Chemistry, University of Chinese Academy of Sciences, CAS, 345 Lingling Road, Shanghai, 200032, China
| | - Sheng-Ye Zhang
- State Key Laboratory of Organometallic Chemistry, Shanghai Institute of Organic Chemistry, University of Chinese Academy of Sciences, CAS, 345 Lingling Road, Shanghai, 200032, China
| | - Hua-Chen Shen
- State Key Laboratory of Organometallic Chemistry, Shanghai Institute of Organic Chemistry, University of Chinese Academy of Sciences, CAS, 345 Lingling Road, Shanghai, 200032, China
| | - Yichen Wu
- State Key Laboratory of Organometallic Chemistry, Shanghai Institute of Organic Chemistry, University of Chinese Academy of Sciences, CAS, 345 Lingling Road, Shanghai, 200032, China
| | - Peng Wang
- State Key Laboratory of Organometallic Chemistry, Shanghai Institute of Organic Chemistry, University of Chinese Academy of Sciences, CAS, 345 Lingling Road, Shanghai, 200032, China
- School of Chemistry and Material Sciences, Hangzhou Institute for Advanced Study, University of Chinese Academy of Sciences, Hangzhou, 310024, China
- College of Material, Chemistry and Chemical Engineering, Key Laboratory of Organosilicon Chemistry and Material Technology of Ministry of Education, Hangzhou Normal University, Hangzhou, 311121, Zhejiang, China
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2
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Huang WS, Xu H, Yang H, Xu LW. Catalytic Synthesis of Silanols by Hydroxylation of Hydrosilanes: From Chemoselectivity to Enantioselectivity. Chemistry 2024; 30:e202302458. [PMID: 37861104 DOI: 10.1002/chem.202302458] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/30/2023] [Revised: 10/19/2023] [Accepted: 10/20/2023] [Indexed: 10/21/2023]
Abstract
As a crucial class of functional molecules in organosilicon chemistry, silanols are found valuable applications in the fields of modern science and will be a potentially powerful framework for biologically active compounds or functional materials. It has witnessed an increasing demand for non-natural organosilanols, as well as the progress in the synthesis of these structural features. From the classic preparative methods to the catalytic selective oxidation of hydrosilanes, electrochemical hydrolysis of hydrosilanes, and then the construction of the most challenging silicon-stereogenic silanols. This review summarized the progress in the catalyzed synthesis of silanols via hydroxylation of hydrosilanes in the last decade, with a particular emphasis on the latest elegant developments in the desymmetrization strategy for the enantioselective synthesis of silicon-stereogenic silanols from dihydrosilanes.
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Affiliation(s)
- Wei-Sheng Huang
- College of Chemistry and Chemical Engineering, Central South University, Changsha, 410083, P. R. China
- Key Laboratory of Organosilicon Chemistry and Material Technology of Ministry of Education, and Key Laboratory of Organosilicon Material Technology of Zhejiang Province College of Material, Chemistry and Chemical Engineering, Hangzhou Normal University, Hangzhou, 311121, P. R. China
| | - Hao Xu
- Key Laboratory of Organosilicon Chemistry and Material Technology of Ministry of Education, and Key Laboratory of Organosilicon Material Technology of Zhejiang Province College of Material, Chemistry and Chemical Engineering, Hangzhou Normal University, Hangzhou, 311121, P. R. China
| | - Hua Yang
- College of Chemistry and Chemical Engineering, Central South University, Changsha, 410083, P. R. China
| | - Li-Wen Xu
- Key Laboratory of Organosilicon Chemistry and Material Technology of Ministry of Education, and Key Laboratory of Organosilicon Material Technology of Zhejiang Province College of Material, Chemistry and Chemical Engineering, Hangzhou Normal University, Hangzhou, 311121, P. R. China
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3
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Chen Y, Wang F, Rao W, Shen S, Sheng D, Wang SY. Copper-Catalyzed Synthesis of S-S Bond-Containing Silanols from SCBs and Trisulfide-1,1-dioxides. J Org Chem 2023. [PMID: 37235545 DOI: 10.1021/acs.joc.2c02968] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
In this work, an efficient method for the copper-catalyzed ring-opening hydrolysis of silacyclobutanes to silanols was developed. This strategy has the advantages of friendly reaction conditions, simple operation, and good functional group compatibility. No additional additives are required in the reaction, and the S-S bond can also be introduced into the organosilanol compounds in one step. Furthermore, the success at the gram scale demonstrates the great potential of the developed protocol for practical industrial applications.
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Affiliation(s)
- Ying Chen
- Key Laboratory of Organic Synthesis of Jiangsu Province, College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou 215123, China
| | - Fei Wang
- Key Laboratory of Organic Synthesis of Jiangsu Province, College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou 215123, China
| | - Weidong Rao
- Key Laboratory of Biomass-based Green Fuels and Chemicals, College of Chemical Engineering, Nanjing Forestry University, Nanjing 210037, China
| | - Shusu Shen
- School of Environmental Science and Engineering, Suzhou University of Science and Technology, No. 99, Xuefu Road, Huqiu district, Suzhou 215009, P.R. China
| | - Daopeng Sheng
- State Key Laboratory of Radiation Medicine and Protection, School for Radiological and Interdisciplinary Sciences (RAD-X) and Collaborative Innovation Center of Radiation Medicine of Jiangsu Higher Education Institutions, Soochow University, Suzhou, Jiangsu 215123, China
| | - Shun-Yi Wang
- Key Laboratory of Organic Synthesis of Jiangsu Province, College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou 215123, China
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4
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Chen YX, He JT, Wu MC, Liu ZL, Xia PJ, Chen K, Xiang HY, Yang H. Visible-light-driven oxidation of organosilanes by a charge-transfer complex. Chem Commun (Camb) 2023; 59:6588-6591. [PMID: 37190787 DOI: 10.1039/d3cc01972a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/17/2023]
Abstract
Direct oxidation of organosilanes is one of the most straightforward ways to access silanols. Herein, we describe a novel photo-induced strategy for oxidation of organosilanes to access silanols, promoted by a photoactive charge-transfer complex (CTC) between sodium benzenesulfinate and molecular O2. A streamlined sequence transformation of organosilanes to silyl ethers was also readily achieved. This developed protocol represents the first example of CTC-based oxidation of organosilanes, offering a facile approach to access a series of silanol and silyl ether products.
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Affiliation(s)
- Yi-Xuan Chen
- College of Chemistry and Chemical Engineering, Central South University, Changsha 410083, P. R. China.
| | - Jun-Tao He
- College of Chemistry and Chemical Engineering, Central South University, Changsha 410083, P. R. China.
| | - Mei-Chun Wu
- College of Chemistry and Chemical Engineering, Central South University, Changsha 410083, P. R. China.
- College of Chemistry and Chemical Engineering, Huaihua University, Huaihua 418008, P. R. China
| | - Zhi-Lin Liu
- College of Chemistry and Chemical Engineering, Central South University, Changsha 410083, P. R. China.
| | - Peng-Ju Xia
- School of Chemistry and Pharmaceutical Sciences, Guangxi Normal University, Guilin 541004, P. R. China
| | - Kai Chen
- College of Chemistry and Chemical Engineering, Central South University, Changsha 410083, P. R. China.
| | - Hao-Yue Xiang
- College of Chemistry and Chemical Engineering, Central South University, Changsha 410083, P. R. China.
- School of Chemistry and Chemical Engineering, Henan Normal University, Xinxiang 453007, Henan, P. R. China
| | - Hua Yang
- College of Chemistry and Chemical Engineering, Central South University, Changsha 410083, P. R. China.
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5
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Goncharova IK, Tukhvatshin RS, Novikov RA, Volodin AD, Korlyukov AA, Lakhtin VG, Arzumanyan A. Complementary Cooperative Catalytic Systems in the Aerobic Oxidation of a Wide Range of Si–H‐Reagents to Si–OH‐Products: From Monomers to Oligomers and Polymers. European J Org Chem 2022. [DOI: 10.1002/ejoc.202200871] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Irina K. Goncharova
- A N Nesmeyanov Institute of Organoelement Compounds RAS: Institut elementoorganiceskih soedinenij imeni A N Nesmeanova RAN Organoelements compounds RUSSIAN FEDERATION
| | - Rinat S. Tukhvatshin
- A N Nesmeyanov Institute of Organoelement Compounds RAS: Institut elementoorganiceskih soedinenij imeni A N Nesmeanova RAN Organoelements compounds RUSSIAN FEDERATION
| | - Roman A. Novikov
- Zelinsky Institute of Organic Chemistry RAS: Institut organiceskoj himii imeni N D Zelinskogo RAN Organic chemistry RUSSIAN FEDERATION
| | - Alexander D. Volodin
- A N Nesmeyanov Institute of Organoelement Compounds RAS: Institut elementoorganiceskih soedinenij imeni A N Nesmeanova RAN Organoelements compounds RUSSIAN FEDERATION
| | - Alexander A. Korlyukov
- A N Nesmeyanov Institute of Organoelement Compounds RAS: Institut elementoorganiceskih soedinenij imeni A N Nesmeanova RAN Organoelements compounds RUSSIAN FEDERATION
| | - Valentin G. Lakhtin
- A V Topchiev Institute of Petrochemical Synthesis Russian Academy of Sciences: Institut neftehimiceskogo sinteza imeni A V Topcieva Rossijskaa akademia nauk Organoelements compounds RUSSIAN FEDERATION
| | - Ashot Arzumanyan
- A N Nesmeyanov Institute of Organoelement Compounds RAS: Institut elementoorganiceskih soedinenij imeni A N Nesmeanova RAN Chemistry 28 Vavilov str. 119991 Moscow RUSSIAN FEDERATION
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6
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Yuan W, Zhu X, Xu Y, He C. Synthesis of Si‐Stereogenic Silanols by Catalytic Asymmetric Hydrolytic Oxidation. Angew Chem Int Ed Engl 2022; 61:e202204912. [DOI: 10.1002/anie.202204912] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/04/2022] [Indexed: 12/21/2022]
Affiliation(s)
- Wei Yuan
- Shenzhen Grubbs Institute and Department of Chemistry Guangdong Provincial Key Laboratory of Catalysis Southern University of Science and Technology Shenzhen Guangdong 518055 China
| | - Xujiang Zhu
- Shenzhen Grubbs Institute and Department of Chemistry Guangdong Provincial Key Laboratory of Catalysis Southern University of Science and Technology Shenzhen Guangdong 518055 China
| | - Yankun Xu
- Shenzhen Grubbs Institute and Department of Chemistry Guangdong Provincial Key Laboratory of Catalysis Southern University of Science and Technology Shenzhen Guangdong 518055 China
| | - Chuan He
- Shenzhen Grubbs Institute and Department of Chemistry Guangdong Provincial Key Laboratory of Catalysis Southern University of Science and Technology Shenzhen Guangdong 518055 China
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7
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Yuan W, Zhu X, Xu Y, He C. Synthesis of Si‐Stereogenic Silanols by Catalytic Asymmetric Hydrolytic Oxidation. Angew Chem Int Ed Engl 2022. [DOI: 10.1002/ange.202204912] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Wei Yuan
- Southern University of Science and Technology Chemistry CHINA
| | - Xujiang Zhu
- Southern University of Science and Technology Chemistry CHINA
| | - Yankun Xu
- Southern University of Science and Technology Chemistry CHINA
| | - Chuan He
- Southern University of Science and Technology Chemistry No 1088,xueyuan Rd.Xili, Nanshan District 518055 Shenzhen CHINA
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8
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Bauer JO. Influence of Amino Functions on the Coordination Ability of Silyl Ethers and Disiloxanes. Organometallics 2022. [DOI: 10.1021/acs.organomet.1c00663] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Jonathan O. Bauer
- Institut für Anorganische Chemie, Fakultät für Chemie und Pharmazie, Universität Regensburg, Universitätsstraße 31, Regensburg D-93053, Germany
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9
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Kondo SI, Okada N, Abe S, Tanaka R, Yamamura M, Unno M. Anion recognition by silanetriol in acetonitrile. Org Biomol Chem 2022; 20:8925-8931. [DOI: 10.1039/d2ob01596j] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
Anion recognition ability and organocatalytic activity of a silanetriol are firstly presented by comparing with those of a series of silanol derivatives.
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Affiliation(s)
- Shin-ichi Kondo
- Department of Chemistry, Faculty of Science, Yamagata University, Yamagata 990-8560, Japan
| | - Natsumi Okada
- Department of Chemistry and Chemical Biology, Graduate School of Science and Technology, Gunma University, Kiryu, Gunma 376-8515, Japan
| | - Shiori Abe
- Department of Chemistry, Faculty of Science, Yamagata University, Yamagata 990-8560, Japan
| | - Ryoji Tanaka
- Department of Chemistry and Chemical Biology, Graduate School of Science and Technology, Gunma University, Kiryu, Gunma 376-8515, Japan
- Sagami Chemical Research Institute, Hayakawa 2743-1, Ayase, Kanagawa 252-1193, Japan
| | - Masaki Yamamura
- Department of Chemistry and Chemical Biology, Graduate School of Science and Technology, Gunma University, Kiryu, Gunma 376-8515, Japan
- Faculty of Engineering, Toyama Prefectural University, 5180 Kurokawa, Imizu, Toyama 939-0398, Japan
| | - Masafumi Unno
- Department of Chemistry and Chemical Biology, Graduate School of Science and Technology, Gunma University, Kiryu, Gunma 376-8515, Japan
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10
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Iazzetti A, Mazzoccanti G, Bencivenni G, Righi P, Calcaterra A, Villani C, Ciogli A. Primary Amine Catalyzed Activation of Carbonyl Compounds: A Study on Reaction Pathways and Reactive Intermediates by Mass Spectrometry. European J Org Chem 2021. [DOI: 10.1002/ejoc.202101272] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Affiliation(s)
- Antonia Iazzetti
- Department of Basic Biotechnological Sciences Intensivological and perioperative clinics Catholic University of Sacred Heart L. go F. Vito 1 00168 Rome Italy
| | - Giulia Mazzoccanti
- Department of Chemistry and Drug Technology Sapienza University of Rome Piazzale A. Moro 5 00185 Rome Italy
| | - Giorgio Bencivenni
- Department of Industrial Chemistry “Toso Montanari” University of Bologna Viale del Risorgimento 4 40136 Bologna Italy
| | - Paolo Righi
- Department of Industrial Chemistry “Toso Montanari” University of Bologna Viale del Risorgimento 4 40136 Bologna Italy
| | - Andrea Calcaterra
- Department of Chemistry and Drug Technology Sapienza University of Rome Piazzale A. Moro 5 00185 Rome Italy
| | - Claudio Villani
- Department of Chemistry and Drug Technology Sapienza University of Rome Piazzale A. Moro 5 00185 Rome Italy
| | - Alessia Ciogli
- Department of Chemistry and Drug Technology Sapienza University of Rome Piazzale A. Moro 5 00185 Rome Italy
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11
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Lv H, Laishram RD, Chen J, Khan R, Zhu Y, Wu S, Zhang J, Liu X, Fan B. Photocatalyzed cross-dehydrogenative coupling of silanes with alcohols and water. Chem Commun (Camb) 2021; 57:3660-3663. [PMID: 33724277 DOI: 10.1039/d1cc00129a] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
An efficient method for the dehydrogenative coupling of silanes with alcohols under photocatalysis was developed. The reaction proceeded in the presence of Ru(bpy)3Cl2 (0.5 mol%) under visible light irradiation in acetonitrile at room temperature. The developed methodology was also applicable for the synthesis of silanols using water as a coupling partner.
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Affiliation(s)
- Haiping Lv
- Key Laboratory of Chemistry in Ethnic Medicinal Resources, Yunnan Minzu University, Yuehua Street, Kunming, 650500, China.
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12
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Weitkamp RF, Neumann B, Stammler H, Hoge B. The Influence of Weakly Coordinating Cations on the O-H⋅⋅⋅O - Hydrogen Bond of Silanol-Silanolate Anions. Chemistry 2021; 27:915-920. [PMID: 33180359 PMCID: PMC7839788 DOI: 10.1002/chem.202004236] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/17/2020] [Revised: 11/06/2020] [Indexed: 11/21/2022]
Abstract
The reaction of a saline phosphazenium hydroxide hydrate with siloxanes led to a novel kind of silanol-silanolate anions. The weakly coordinating behavior of the cation renders the formation of silanol-silanolate hydrogen bonds possible, which otherwise suffer from detrimental silanolate-oxygen cation interactions. We investigated the influence of various weakly coordinating cations on silanol-silanolate motifs, particularly with regard to different cation sizes. While large cations favor the formation of intramolecular hydrogen bonds resulting in cyclic structures, the less bulky tetramethyl ammonium cation encourages the formation of polyanionic silanol-silanolate chains in the solid state.
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Affiliation(s)
- Robin F. Weitkamp
- Centrum für Molekulare MaterialienFakultät für ChemieUniversität BielefeldUniversitätsstraße 2533615BielefeldGermany
| | - Beate Neumann
- Centrum für Molekulare MaterialienFakultät für ChemieUniversität BielefeldUniversitätsstraße 2533615BielefeldGermany
| | - Hans‐Georg Stammler
- Centrum für Molekulare MaterialienFakultät für ChemieUniversität BielefeldUniversitätsstraße 2533615BielefeldGermany
| | - Berthold Hoge
- Centrum für Molekulare MaterialienFakultät für ChemieUniversität BielefeldUniversitätsstraße 2533615BielefeldGermany
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13
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Liang H, Wang LJ, Ji YX, Wang H, Zhang B. Selective Electrochemical Hydrolysis of Hydrosilanes to Silanols via Anodically Generated Silyl Cations. Angew Chem Int Ed Engl 2020; 60:1839-1844. [PMID: 33058450 DOI: 10.1002/anie.202010437] [Citation(s) in RCA: 40] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/30/2020] [Indexed: 01/08/2023]
Abstract
The first electrochemical hydrolysis of hydrosilanes to silanols under mild and neutral reaction conditions is reported. The practical protocol employs commercially available and cheap NHPI as a hydrogen-atom transfer (HAT) mediator and operates at room temperature with high selectivity, leading to various valuable silanols in moderate to good yields. Notably, this electrochemical method exhibits a broad substrate scope and high functional-group compatibility, and it is applicable to late-stage functionalization of complex molecules. Preliminary mechanistic studies suggest that the reaction appears to proceed through a nucleophilic substitution reaction of an electrogenerated silyl cation with H2 O.
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Affiliation(s)
- Hao Liang
- State Key Laboratory of Natural Medicines, China Pharmaceutical University, Nanjing, 210009, China
| | - Lu-Jun Wang
- State Key Laboratory of Natural Medicines, China Pharmaceutical University, Nanjing, 210009, China
| | - Yun-Xing Ji
- State Key Laboratory of Natural Medicines, China Pharmaceutical University, Nanjing, 210009, China
| | - Han Wang
- State Key Laboratory of Natural Medicines, China Pharmaceutical University, Nanjing, 210009, China
| | - Bo Zhang
- State Key Laboratory of Natural Medicines, China Pharmaceutical University, Nanjing, 210009, China
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14
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Liang H, Wang L, Ji Y, Wang H, Zhang B. Selective Electrochemical Hydrolysis of Hydrosilanes to Silanols via Anodically Generated Silyl Cations. Angew Chem Int Ed Engl 2020. [DOI: 10.1002/ange.202010437] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Affiliation(s)
- Hao Liang
- State Key Laboratory of Natural Medicines China Pharmaceutical University Nanjing 210009 China
| | - Lu‐Jun Wang
- State Key Laboratory of Natural Medicines China Pharmaceutical University Nanjing 210009 China
| | - Yun‐Xing Ji
- State Key Laboratory of Natural Medicines China Pharmaceutical University Nanjing 210009 China
| | - Han Wang
- State Key Laboratory of Natural Medicines China Pharmaceutical University Nanjing 210009 China
| | - Bo Zhang
- State Key Laboratory of Natural Medicines China Pharmaceutical University Nanjing 210009 China
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15
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Mammadova F, Hamarat B, Ahmadli D, Şahin O, Bozkaya U, Türkmen YE. Polarization‐Enhanced Hydrogen Bonding in 1,8‐Dihydroxynaphthalene: Conformational Analysis, Binding Studies and Hydrogen Bonding Catalysis. ChemistrySelect 2020. [DOI: 10.1002/slct.202002960] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Affiliation(s)
- Flora Mammadova
- Department of Chemistry, Faculty of Science Bilkent University Ankara 06800 Turkey
| | - Büşra Hamarat
- Department of Chemistry Hacettepe University Ankara 06800 Turkey
| | - Dilgam Ahmadli
- Department of Chemistry, Faculty of Science Bilkent University Ankara 06800 Turkey
| | - Onur Şahin
- Scientific and Technological Research Application and Research Center Sinop University Sinop 57000 Turkey
| | - Uğur Bozkaya
- Department of Chemistry Hacettepe University Ankara 06800 Turkey
| | - Yunus E. Türkmen
- Department of Chemistry, Faculty of Science Bilkent University Ankara 06800 Turkey
- UNAM-National Nanotechnology Research Center, Institute of Materials Science and Nanotechnology Bilkent University Ankara 06800 Turkey
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16
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Bähr S, Brinkmann-Chen S, Garcia-Borràs M, Roberts JM, Katsoulis DE, Houk KN, Arnold FH. Selective Enzymatic Oxidation of Silanes to Silanols. Angew Chem Int Ed Engl 2020; 59:15507-15511. [PMID: 32212229 PMCID: PMC7511438 DOI: 10.1002/anie.202002861] [Citation(s) in RCA: 39] [Impact Index Per Article: 9.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/24/2020] [Indexed: 11/08/2022]
Abstract
Compared to the biological world's rich chemistry for functionalizing carbon, enzymatic transformations of the heavier homologue silicon are rare. We report that a wild-type cytochrome P450 monooxygenase (P450BM3 from Bacillus megaterium, CYP102A1) has promiscuous activity for oxidation of hydrosilanes to give silanols. Directed evolution was applied to enhance this non-native activity and create a highly efficient catalyst for selective silane oxidation under mild conditions with oxygen as the terminal oxidant. The evolved enzyme leaves C-H bonds present in the silane substrates untouched, and this biotransformation does not lead to disiloxane formation, a common problem in silanol syntheses. Computational studies reveal that catalysis proceeds through hydrogen atom abstraction followed by radical rebound, as observed in the native C-H hydroxylation mechanism of the P450 enzyme. This enzymatic silane oxidation extends nature's impressive catalytic repertoire.
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Affiliation(s)
- Susanne Bähr
- Division of Chemistry and Chemical Engineering, California Institute of Technology, 1200 East California Blvd, Pasadena, CA, 91125, USA
| | - Sabine Brinkmann-Chen
- Division of Chemistry and Chemical Engineering, California Institute of Technology, 1200 East California Blvd, Pasadena, CA, 91125, USA
| | - Marc Garcia-Borràs
- Department of Chemistry and Biochemistry, University of California, Los Angeles, CA, 90095, USA
- Present address: Institut de Química Computacional i Catàlisi (IQCC), Departament de Química, Universitat de Girona, Girona, Spain
| | - John M Roberts
- Dow Core R&D, 633 Washington Street, Midland, MI, 48674, USA
| | | | - K N Houk
- Department of Chemistry and Biochemistry, University of California, Los Angeles, CA, 90095, USA
| | - Frances H Arnold
- Division of Chemistry and Chemical Engineering, California Institute of Technology, 1200 East California Blvd, Pasadena, CA, 91125, USA
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17
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Jagannathan JR, Fettinger JC, Shaw JT, Franz AK. Enantioselective Si-H Insertion Reactions of Diarylcarbenes for the Synthesis of Silicon-Stereogenic Silanes. J Am Chem Soc 2020; 142:11674-11679. [PMID: 32539370 PMCID: PMC7747653 DOI: 10.1021/jacs.0c04533] [Citation(s) in RCA: 66] [Impact Index Per Article: 16.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
We report the first example of enantioselective, intermolecular diarylcarbene insertion into Si-H bonds for the synthesis of silicon-stereogenic silanes. Dirhodium(II) carboxylates catalyze an Si-H insertion using carbenes derived from diazo compounds where selective formation of an enantioenriched silicon center is achieved using prochiral silanes. Fourteen prochiral silanes were evaluated with symmetrical and prochiral diazo reactants to produce a total of 25 novel silanes. Adding an ortho substituent on one phenyl ring of a prochiral diazo enhances enantioselectivity up to 95:5 er with yields up to 98%. Using in situ IR spectroscopy, the impact of the off-cycle azine formation is supported based on the structural dependence for relative rates of diazo decomposition. A catalytic cycle is proposed with Si-H insertion as the rate-determining step, supported by kinetic isotope experiments. Transformations of an enantioenriched silane derived from this method, including selective synthesis of a novel sila-indane, are demonstrated.
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Affiliation(s)
- Jake R. Jagannathan
- Department of Chemistry, University of California, One Shields Avenue, Davis, California 95616, United States
| | - James C. Fettinger
- Department of Chemistry, University of California, One Shields Avenue, Davis, California 95616, United States
| | - Jared T. Shaw
- Department of Chemistry, University of California, One Shields Avenue, Davis, California 95616, United States
| | - Annaliese K. Franz
- Department of Chemistry, University of California, One Shields Avenue, Davis, California 95616, United States
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18
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Morisue M, Kusukawa T, Watase S. Dipyrrin Complexes of Borasiloxane Silanols with Adaptive Hydrogen‐Bonded Conformations in the Crystal and in Solution States. Eur J Inorg Chem 2020. [DOI: 10.1002/ejic.202000118] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Affiliation(s)
- Mitsuhiko Morisue
- Faculty of Molecular Chemistry and Engineering Kyoto Institute of Technology Matsugasaki, Sakyo‐ku 606‐8585 Kyoto Japan
| | - Takahiro Kusukawa
- Faculty of Molecular Chemistry and Engineering Kyoto Institute of Technology Matsugasaki, Sakyo‐ku 606‐8585 Kyoto Japan
| | - Seiji Watase
- Osaka Research Institute of Industrial Science and Technology 1‐6‐50, Morinomiya, Joto‐ku 536‐8553 Osaka Japan
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19
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Bähr S, Brinkmann‐Chen S, Garcia‐Borràs M, Roberts JM, Katsoulis DE, Houk KN, Arnold FH. Selective Enzymatic Oxidation of Silanes to Silanols. Angew Chem Int Ed Engl 2020. [DOI: 10.1002/ange.202002861] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Susanne Bähr
- Division of Chemistry and Chemical Engineering California Institute of Technology 1200 East California Blvd Pasadena CA 91125 USA
| | - Sabine Brinkmann‐Chen
- Division of Chemistry and Chemical Engineering California Institute of Technology 1200 East California Blvd Pasadena CA 91125 USA
| | - Marc Garcia‐Borràs
- Department of Chemistry and Biochemistry University of California Los Angeles CA 90095 USA
- Present address: Institut de Química Computacional i Catàlisi (IQCC) Departament de Química Universitat de Girona Girona Spain
| | | | | | - K. N. Houk
- Department of Chemistry and Biochemistry University of California Los Angeles CA 90095 USA
| | - Frances H. Arnold
- Division of Chemistry and Chemical Engineering California Institute of Technology 1200 East California Blvd Pasadena CA 91125 USA
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20
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Espinosa‐Jalapa NA, Bauer JO. Controlled Synthesis and Molecular Structures of Methoxy‐, Amino‐, and Chloro‐Functionalized Disiloxane Building Blocks. Z Anorg Allg Chem 2020. [DOI: 10.1002/zaac.202000049] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Affiliation(s)
- Noel Angel Espinosa‐Jalapa
- Institut für Anorganische Chemie Fakultät für Chemie und Pharmazie Universität Regensburg Universitätsstraße 31 93053 Regensburg Germany
| | - Jonathan O. Bauer
- Institut für Anorganische Chemie Fakultät für Chemie und Pharmazie Universität Regensburg Universitätsstraße 31 93053 Regensburg Germany
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21
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Luo N, Liao J, Ouyang L, Wen H, Zhong Y, Liu J, Tang W, Luo R. Highly Selective Hydroxylation and Alkoxylation of Silanes: One-Pot Silane Oxidation and Reduction of Aldehydes/Ketones. Organometallics 2019. [DOI: 10.1021/acs.organomet.9b00716] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Nianhua Luo
- School of Pharmaceutical Sciences, Gannan Medical University, Ganzhou 341000, Jiangxi Province People’s Republic of China
| | - Jianhua Liao
- School of Pharmaceutical Sciences, Gannan Medical University, Ganzhou 341000, Jiangxi Province People’s Republic of China
- School of Pharmacy, University of Wisconsin−Madison, Madison, Wisconsin 53705, United States
| | - Lu Ouyang
- School of Pharmaceutical Sciences, Gannan Medical University, Ganzhou 341000, Jiangxi Province People’s Republic of China
| | - Huiling Wen
- School of Pharmaceutical Sciences, Gannan Medical University, Ganzhou 341000, Jiangxi Province People’s Republic of China
| | - Yuhong Zhong
- School of Pharmaceutical Sciences, Gannan Medical University, Ganzhou 341000, Jiangxi Province People’s Republic of China
| | - Jitian Liu
- School of Pharmacy, University of Wisconsin−Madison, Madison, Wisconsin 53705, United States
| | - Weiping Tang
- School of Pharmacy, University of Wisconsin−Madison, Madison, Wisconsin 53705, United States
| | - Renshi Luo
- School of Pharmaceutical Sciences, Gannan Medical University, Ganzhou 341000, Jiangxi Province People’s Republic of China
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22
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Jagannathan JR, Diemoz KM, Targos K, Fettinger JC, Franz AK. Kinetic and Binding Studies Reveal Cooperativity and Off-Cycle Competition for H-Bonding Catalysis with Silsesquioxane Silanols. Chemistry 2019; 25:14953-14958. [PMID: 31448459 DOI: 10.1002/chem.201903693] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/13/2019] [Indexed: 01/23/2023]
Abstract
The catalytic activity, kinetics, and quantification of H-bonding ability of incompletely condensed polyhedral oligomeric silsesquioxane (POSS) silanols are reported. POSS-triols, a homogeneous model for vicinal silica surface sites, exhibit enhanced H-bonding compared with other silanols and alcohols as quantified using a 31 P NMR probe. Evaluation of a Friedel-Crafts addition reaction shows that phenyl-POSS-triol is active as an H-bond donor catalyst whereas other POSS silanols studied are not. An in-depth kinetic study (using RPKA and VTNA) highlights the concentration-dependent H-bonding behavior of POSS-triols, which is attributed to intermolecular association forming an off-cycle dimeric species. Binding constants provide additional support for reduced H-bond ability at higher concentrations, which is attributed to competitive association. POSS-triol self-association disrupts H-bond donor abilities relevant for catalysis by reducing the concentration of active monomeric catalyst.
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Affiliation(s)
- Jake R Jagannathan
- Department of Chemistry, University of California, Davis, One Shields Avenue, Davis, CA, USA
| | - Kayla M Diemoz
- Department of Chemistry, University of California, Davis, One Shields Avenue, Davis, CA, USA
| | - Karina Targos
- Department of Chemistry, University of California, Davis, One Shields Avenue, Davis, CA, USA
| | - James C Fettinger
- Department of Chemistry, University of California, Davis, One Shields Avenue, Davis, CA, USA
| | - Annaliese K Franz
- Department of Chemistry, University of California, Davis, One Shields Avenue, Davis, CA, USA
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23
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Li W, Liu H, Chen X, Li S, Zheng R, Zhang C, Zheng X, Yuan M, Li R, Fu H, Chen H. Palladium-catalyzed direct ortho-alkynylation of aryl acetamides with low catalyst loading. Tetrahedron Lett 2019. [DOI: 10.1016/j.tetlet.2019.06.003] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
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24
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Wang K, Zhou J, Jiang Y, Zhang M, Wang C, Xue D, Tang W, Sun H, Xiao J, Li C. Selective Manganese‐Catalyzed Oxidation of Hydrosilanes to Silanols under Neutral Reaction Conditions. Angew Chem Int Ed Engl 2019; 58:6380-6384. [DOI: 10.1002/anie.201900342] [Citation(s) in RCA: 28] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/09/2019] [Indexed: 11/08/2022]
Affiliation(s)
- Kaikai Wang
- Key Laboratory of Applied Surface and Colloid ChemistryMinistry of Education and School of Chemistry and Chemical EngineeringShaanxi Normal University Xi'an 710119 China
| | - Jimei Zhou
- Key Laboratory of Applied Surface and Colloid ChemistryMinistry of Education and School of Chemistry and Chemical EngineeringShaanxi Normal University Xi'an 710119 China
| | - Yuting Jiang
- Key Laboratory of Applied Surface and Colloid ChemistryMinistry of Education and School of Chemistry and Chemical EngineeringShaanxi Normal University Xi'an 710119 China
| | - Miaomiao Zhang
- Key Laboratory of Applied Surface and Colloid ChemistryMinistry of Education and School of Chemistry and Chemical EngineeringShaanxi Normal University Xi'an 710119 China
| | - Chao Wang
- Key Laboratory of Applied Surface and Colloid ChemistryMinistry of Education and School of Chemistry and Chemical EngineeringShaanxi Normal University Xi'an 710119 China
| | - Dong Xue
- Key Laboratory of Applied Surface and Colloid ChemistryMinistry of Education and School of Chemistry and Chemical EngineeringShaanxi Normal University Xi'an 710119 China
| | - Weijun Tang
- Key Laboratory of Applied Surface and Colloid ChemistryMinistry of Education and School of Chemistry and Chemical EngineeringShaanxi Normal University Xi'an 710119 China
| | - Huamin Sun
- Key Laboratory of Applied Surface and Colloid ChemistryMinistry of Education and School of Chemistry and Chemical EngineeringShaanxi Normal University Xi'an 710119 China
| | - Jianliang Xiao
- Key Laboratory of Applied Surface and Colloid ChemistryMinistry of Education and School of Chemistry and Chemical EngineeringShaanxi Normal University Xi'an 710119 China
- Department of ChemistryUniversity of Liverpool Liverpool L69 7ZD UK
| | - Chaoqun Li
- Key Laboratory of Applied Surface and Colloid ChemistryMinistry of Education and School of Chemistry and Chemical EngineeringShaanxi Normal University Xi'an 710119 China
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25
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Kelly A, Franz AK. Metal-Free Synthesis of 1,3-Disiloxanediols and Aryl Siloxanols. ACS OMEGA 2019; 4:6295-6300. [PMID: 31459769 PMCID: PMC6648610 DOI: 10.1021/acsomega.9b00121] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/14/2019] [Accepted: 03/20/2019] [Indexed: 05/28/2023]
Abstract
The first example of metal-free oxidative hydrolysis of hydrido-siloxanes is reported. Both base-catalyzed and organocatalytic hydrolysis methods are demonstrated to transform 1,3-dihydrido-disiloxanes into 1,3-disiloxanediols. The first example of a chemoselective silane hydrolysis is demonstrated.
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26
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Wang K, Zhou J, Jiang Y, Zhang M, Wang C, Xue D, Tang W, Sun H, Xiao J, Li C. Selective Manganese‐Catalyzed Oxidation of Hydrosilanes to Silanols under Neutral Reaction Conditions. Angew Chem Int Ed Engl 2019. [DOI: 10.1002/ange.201900342] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Affiliation(s)
- Kaikai Wang
- Key Laboratory of Applied Surface and Colloid ChemistryMinistry of Education and School of Chemistry and Chemical EngineeringShaanxi Normal University Xi'an 710119 China
| | - Jimei Zhou
- Key Laboratory of Applied Surface and Colloid ChemistryMinistry of Education and School of Chemistry and Chemical EngineeringShaanxi Normal University Xi'an 710119 China
| | - Yuting Jiang
- Key Laboratory of Applied Surface and Colloid ChemistryMinistry of Education and School of Chemistry and Chemical EngineeringShaanxi Normal University Xi'an 710119 China
| | - Miaomiao Zhang
- Key Laboratory of Applied Surface and Colloid ChemistryMinistry of Education and School of Chemistry and Chemical EngineeringShaanxi Normal University Xi'an 710119 China
| | - Chao Wang
- Key Laboratory of Applied Surface and Colloid ChemistryMinistry of Education and School of Chemistry and Chemical EngineeringShaanxi Normal University Xi'an 710119 China
| | - Dong Xue
- Key Laboratory of Applied Surface and Colloid ChemistryMinistry of Education and School of Chemistry and Chemical EngineeringShaanxi Normal University Xi'an 710119 China
| | - Weijun Tang
- Key Laboratory of Applied Surface and Colloid ChemistryMinistry of Education and School of Chemistry and Chemical EngineeringShaanxi Normal University Xi'an 710119 China
| | - Huamin Sun
- Key Laboratory of Applied Surface and Colloid ChemistryMinistry of Education and School of Chemistry and Chemical EngineeringShaanxi Normal University Xi'an 710119 China
| | - Jianliang Xiao
- Key Laboratory of Applied Surface and Colloid ChemistryMinistry of Education and School of Chemistry and Chemical EngineeringShaanxi Normal University Xi'an 710119 China
- Department of ChemistryUniversity of Liverpool Liverpool L69 7ZD UK
| | - Chaoqun Li
- Key Laboratory of Applied Surface and Colloid ChemistryMinistry of Education and School of Chemistry and Chemical EngineeringShaanxi Normal University Xi'an 710119 China
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27
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Saá JM, Lillo VJ, Mansilla J. Catalysis by Networks of Cooperative Hydrogen Bonds. NONCOVALENT INTERACTIONS IN CATALYSIS 2019. [DOI: 10.1039/9781788016490-00066] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Abstract
The main paradigm of today's chemistry is sustainability. In pursuing sustainability, we need to learn from chemical processes carried out by Nature and realize that Nature does not use either strong acids, or strong bases or fancy reagents to achieve outstanding chemical processes. Instead, enzyme activity leans on the cooperation of several chemical entities to avoid strong acids or bases or to achieve such an apparently simple goal as transferring a proton from an NuH unit to an E unit (NuH + E → Nu–EH). Hydrogen bond catalysis emerged strongly two decades ago in trying to imitate Nature and avoid metal catalysis. Now to mount another step in pursuing the goal of sustainability, the focus is upon cooperativity between the different players involved in catalysis. This chapter looks at the concept of cooperativity and, more specifically, (a) examines the role of cooperative hydrogen bonded arrays of the general type NuH⋯(NuH)n⋯NuH (i.e. intermolecular cooperativity) to facilitate general acid–base catalysis, not only in the solution phase but also under solvent-free and catalyst-free conditions, and, most important, (b) analyzes the capacity of designer chiral organocatalysts displaying intramolecular networks of cooperative hydrogen bonds (NCHBs) to facilitate enantioselective synthesis by bringing conformational rigidity to the catalyst in addition to simultaneously increasing the acidity of key hydrogen atoms so to achieve better complementarity in the highly polarized transition states.
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Affiliation(s)
- José M. Saá
- Department de Química, Universitat de les Illes Balears Crta. de Valldemossa km 7.5 07122 Palma de Mallorca Illes Balears Spain
| | - Victor J. Lillo
- Department de Química, Universitat de les Illes Balears Crta. de Valldemossa km 7.5 07122 Palma de Mallorca Illes Balears Spain
| | - Javier Mansilla
- Department de Química, Universitat de les Illes Balears Crta. de Valldemossa km 7.5 07122 Palma de Mallorca Illes Balears Spain
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28
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Diemoz KM, Franz AK. NMR Quantification of Hydrogen-Bond-Activating Effects for Organocatalysts including Boronic Acids. J Org Chem 2018; 84:1126-1138. [PMID: 30516381 DOI: 10.1021/acs.joc.8b02389] [Citation(s) in RCA: 39] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
The hydrogen-bonding activation for 66 organocatalysts has been quantified using a 31P NMR binding experiment with triethylphosphine oxide (TEPO). Diverse structural classes, including phenols, diols, silanols, carboxylic acids, boronic acids, and phosphoric acids, were examined with a variety of steric and electronic modifications to understand how the structure and secondary effects contribute to hydrogen-bonding ability and catalysis. Hammett plots demonstrate high correlation for the Δδ 31P NMR shift to Hammett parameters, establishing the ability of TEPO binding to predict electronic trends. Upon correlation to catalytic activity in a Friedel-Crafts addition reaction, data demonstrate that 31P NMR shifts correlate to catalytic activity better than p Ka values. Boronic acids were investigated, and 31P NMR binding experiments predicted strong hydrogen-bonding ability, for which catalytic activity was confirmed, resulting in the greatest rate enhancement observed in the Friedel-Crafts addition of all organocatalysts studied. A detailed investigation supports that boronic acid activation proceeds through hydrogen-bonding interactions and not coordination with the Lewis acidic boron center. Using 31P NMR spectroscopy offers a simple and rapid tool to quantify and predict hydrogen-bonding abilities for the design and applications of new organocatalysts and supramolecular synthons.
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Affiliation(s)
- Kayla M Diemoz
- Department of Chemistry , University of California , One Shields Avenue , Davis , California 95616 , United States
| | - Annaliese K Franz
- Department of Chemistry , University of California , One Shields Avenue , Davis , California 95616 , United States
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29
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Liu J, Zhang M, Gao W, Fedorchuk A, Kityk I. Synthesis and nonlinear optical properties of novel conjugated small molecules based on indole donor. J Mol Struct 2018. [DOI: 10.1016/j.molstruc.2018.03.133] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
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30
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Duke BJ, Akeroyd EN, Bhatt SV, Onyeagusi CI, Bhatt SV, Adolph BR, Fotie J. Nano-dispersed platinum(0) in organically modified silicate matrices as sustainable catalysts for a regioselective hydrosilylation of alkenes and alkynes. NEW J CHEM 2018. [DOI: 10.1039/c8nj01889h] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
Comparative analysis of the catalytic effect of Pt(0) nano-dispersed in siloxane matrices on the hydrosilylation of alkenes and alkynes.
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Affiliation(s)
- Brett J. Duke
- Department of Chemistry and Physics
- Southeastern Louisiana University
- SLU 10878
- Hammond
- USA
| | - Evan N. Akeroyd
- Department of Chemistry and Physics
- Southeastern Louisiana University
- SLU 10878
- Hammond
- USA
| | - Shreeja V. Bhatt
- Department of Chemistry and Physics
- Southeastern Louisiana University
- SLU 10878
- Hammond
- USA
| | - Chibueze I. Onyeagusi
- Department of Chemistry and Physics
- Southeastern Louisiana University
- SLU 10878
- Hammond
- USA
| | - Shreya V. Bhatt
- Department of Chemistry and Physics
- Southeastern Louisiana University
- SLU 10878
- Hammond
- USA
| | - Brandy R. Adolph
- Department of Chemistry and Physics
- Southeastern Louisiana University
- SLU 10878
- Hammond
- USA
| | - Jean Fotie
- Department of Chemistry and Physics
- Southeastern Louisiana University
- SLU 10878
- Hammond
- USA
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31
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Huang JD, Ma H. The mechanism of the excited-state multiple proton transfer reaction for 3-Me-2,6-diazaindole in aqueous solution. Org Chem Front 2018. [DOI: 10.1039/c8qo00628h] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
Abstract
The potential energy curves show that(2,6-aza)Indin aqueous solution undergoes a quadruple-proton transfer reaction with the assistance of three water molecules.
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Affiliation(s)
- Jin-Dou Huang
- Key Laboratory of New Energy and Rare Earth Resource Utilization of State Ethnic Affairs Commission
- Key Laboratory of Photosensitive Materials and Devices of Liaoning Province
- School of Physics and Materials Engineering
- Dalian Nationalities University
- Dalian 116600
| | - Huipeng Ma
- College of Medical Laboratory Science
- Dalian Medical University
- Dalian 116044
- P. R. China
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32
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Fan Y, Kass SR. Enantioselective Friedel-Crafts Alkylation between Nitroalkenes and Indoles Catalyzed by Charge Activated Thiourea Organocatalysts. J Org Chem 2017; 82:13288-13296. [PMID: 29166016 DOI: 10.1021/acs.joc.7b02411] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
A series of methylated and octylated pyridinium and quinolinium containing thiourea salts with a chiral 2-indanol substituent are reported. These organocatalysts are positively charged analogues of privileged bis(3,5-trifluoromethyl)phenyl substituted thioureas, and are found to be much more active catalysts despite the absence of an additional hydrogen bond donor or acceptor site (i.e., the presence of a heteroatom-hydrogen or heteroatom). Friedel-Crafts reactions of trans-β-nitorostyrenes with indoles are examined, and good yields and enantioselectivities are obtained. Mechanistic studies indicate that this is a second-order transformation under the employed conditions, and is consistent with the dimer of the thiourea being the active catalyst. Charged organocatalysts, consequently, represent an attractive design strategy for catalyst development.
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Affiliation(s)
- Yang Fan
- Department of Chemistry, University of Minnesota , 207 Pleasant Street, SE, Minneapolis, Minnesota 55455, United States
| | - Steven R Kass
- Department of Chemistry, University of Minnesota , 207 Pleasant Street, SE, Minneapolis, Minnesota 55455, United States
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33
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Cirujano FG, López-Maya E, Rodríguez-Albelo M, Barea E, Navarro JAR, De Vos DE. Selective One-Pot Two-Step C−C Bond Formation using Metal-Organic Frameworks with Mild Basicity as Heterogeneous Catalysts. ChemCatChem 2017. [DOI: 10.1002/cctc.201700784] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Francisco G. Cirujano
- Centre for Surface Chemistry and Catalysis; Department of Microbial and Molecular Systems (M2S); KU Leuven; Celestijnenlaan 200F 3001 Leuven Belgium
| | - Elena López-Maya
- Departamento de Química Inorgánica; Universidad de Granada; Av. Fuentenueva S/N 18071 Granada Spain
| | - Marleny Rodríguez-Albelo
- Departamento de Química Inorgánica; Universidad de Granada; Av. Fuentenueva S/N 18071 Granada Spain
| | - Elisa Barea
- Departamento de Química Inorgánica; Universidad de Granada; Av. Fuentenueva S/N 18071 Granada Spain
| | - Jorge A. R. Navarro
- Departamento de Química Inorgánica; Universidad de Granada; Av. Fuentenueva S/N 18071 Granada Spain
| | - Dirk E. De Vos
- Centre for Surface Chemistry and Catalysis; Department of Microbial and Molecular Systems (M2S); KU Leuven; Celestijnenlaan 200F 3001 Leuven Belgium
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