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Zou H, Wang Z, Guo D, Zhang L, Wang S, Zhu X. Synthesis and catalytic activity of tetradentate β-diketiminato rare-earth metal monoalkyl complexes in tandem Oppenauer oxidation and cross-aldol condensation. Dalton Trans 2023; 53:267-275. [PMID: 38038403 DOI: 10.1039/d3dt03374k] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/02/2023]
Abstract
A series of unsymmetric tetradentate β-diketiminato rare-earth metal monoalkyl complexes were synthesized, and their catalytic behavior has been well developed. Indole-incorporated β-diketiminato proligands H2L (L = MeC(NDipp)CHC(Me)NCH2CH2-3-(1-R-C8H4N), R = CH2-(2-C4H7O), L1; R = (CH2)2OMe, L2; Dipp = 2,6-iPr2C6H3) were prepared by the reaction of an arylamino-enone with 1-substituted-tryptamine in good yields. Treatment of the proligands with the rare-earth metal trialkyl complexes RE(CH2SiMe3)3(THF)2 generated the corresponding unsymmetric N,N,C,O-tetradentate β-diketiminato rare-earth metal monoalkyl complexes LRE(CH2SiMe3) (L1, RE = Y (1a), Gd (1b), Yb (1c), Lu (1d); L2, RE = Y (2a), Gd (2b), Yb (2c), and Lu(2d)). During the process, the activation of the sp2 C-H bond at the 2-position of the indole ring led to the formation of an unprecedented β-diketiminato dianion L2-, bonding to the rare-earth metal ions in a chelating N,N,C,O-tetradentate manner. Further studies indicated that these tetradentate rare-earth metal complexes could initiate the Oppenauer oxidation of secondary alcohols into the corresponding ketones in high yields. In the case of primary alcohols, a tandem Oppenauer oxidation and cross-aldol condensation occurred unexpectedly. Various α-mono-substituted benzylidene acetones, α,α'-bis-substituted benzylidene acetones and cyclohexanones were obtained under mild conditions only by controlling the molar ratio of alcohols to ketones. Notably, all these alkenylation ketones exhibited exclusive E configuration.
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Affiliation(s)
- Haiyan Zou
- Key Laboratory of Functional Molecular Solids, Ministry of Education, Anhui Laboratory of Molecule-Based Materials, College of Chemistry and Materials Science, Anhui Normal University, Wuhu, Anhui 241002, China.
| | - Ziqian Wang
- Key Laboratory of Functional Molecular Solids, Ministry of Education, Anhui Laboratory of Molecule-Based Materials, College of Chemistry and Materials Science, Anhui Normal University, Wuhu, Anhui 241002, China.
| | - Dianjun Guo
- Key Laboratory of Functional Molecular Solids, Ministry of Education, Anhui Laboratory of Molecule-Based Materials, College of Chemistry and Materials Science, Anhui Normal University, Wuhu, Anhui 241002, China.
| | - Lijun Zhang
- Key Laboratory of Functional Molecular Solids, Ministry of Education, Anhui Laboratory of Molecule-Based Materials, College of Chemistry and Materials Science, Anhui Normal University, Wuhu, Anhui 241002, China.
| | - Shaowu Wang
- Key Laboratory of Functional Molecular Solids, Ministry of Education, Anhui Laboratory of Molecule-Based Materials, College of Chemistry and Materials Science, Anhui Normal University, Wuhu, Anhui 241002, China.
- Anhui Laboratory of Clean Catalytic Engineering, Anhui Laboratory of Functional Complexes for Materials Chemistry and Application, College of Chemical and Environmental Engineering, Anhui Polytechnic University, Wuhu, Anhui 241000, China
| | - Xiancui Zhu
- Key Laboratory of Functional Molecular Solids, Ministry of Education, Anhui Laboratory of Molecule-Based Materials, College of Chemistry and Materials Science, Anhui Normal University, Wuhu, Anhui 241002, China.
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Zade VM, Gangnale LD, Athawale PR, Reddy DS. Direct Deoxygenation of α-Hydroxy and α,β-Dihydroxy Ketones Using a Silyl Lithium Reagent. J Org Chem 2023; 88:14227-14235. [PMID: 37728533 DOI: 10.1021/acs.joc.3c01613] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 09/21/2023]
Abstract
A reliable method for the one-step direct deoxygenation of α-hydroxy ketones has been developed using a silyl lithium reagent and acetic anhydride. The method is metal-catalyst-free and does not require prefunctionalization of the hydroxy group prior to its removal. Deoxygenation of different primary, secondary, and tertiary alcohols was carried out with up to 98% isolated yield. Additionally, double deoxygenation was achieved when the present method was applied to α,β-dihydroxy ketones to access the corresponding enones in a single step.
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Affiliation(s)
- Vishal M Zade
- Organic Chemistry Division, CSIR-National Chemical Laboratory, Dr. Homi Bhabha Road, Pune, Maharashtra 411008, India
- Academy of Scientific and Innovative Research (AcSIR), Ghaziabad, Uttar Pradesh 201002, India
| | - Laxmikant D Gangnale
- Academy of Scientific and Innovative Research (AcSIR), Ghaziabad, Uttar Pradesh 201002, India
- CSIR-Indian Institute of Chemical Technology (CSIR-IICT), Hyderabad, Telangana 500007, India
| | - Paresh R Athawale
- Organic Chemistry Division, CSIR-National Chemical Laboratory, Dr. Homi Bhabha Road, Pune, Maharashtra 411008, India
| | - D Srinivasa Reddy
- Organic Chemistry Division, CSIR-National Chemical Laboratory, Dr. Homi Bhabha Road, Pune, Maharashtra 411008, India
- Academy of Scientific and Innovative Research (AcSIR), Ghaziabad, Uttar Pradesh 201002, India
- CSIR-Indian Institute of Chemical Technology (CSIR-IICT), Hyderabad, Telangana 500007, India
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Aman M, Dostál L, Růžička A, Tydlitát J, Beckmann J, Turek J, Jambor R. Sn, P-coordinated Ru cation: a robust catalyst for aerobic oxidations of benzylamine and benzyl alcohol. Chem Commun (Camb) 2021; 57:12992-12995. [PMID: 34796897 DOI: 10.1039/d1cc06173a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A stable ionic κ2Sn,P-coordinated Ru complex shows excellent catalytic activity in aerobic oxidations of benzylamine and benzyl alcohol. This complex is stabilized by a stannylene-phosphine peri-substituted naphthalene ligand, which can act as either a reducing agent for a Ru(III) complex or as a κ2Sn,P-chelating ligand for Ru(II) compounds.
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Affiliation(s)
- Michal Aman
- Department of General and Inorganic Chemistry, University of Pardubice, 532 10 Pardubice, Czech Republic.
| | - Libor Dostál
- Department of General and Inorganic Chemistry, University of Pardubice, 532 10 Pardubice, Czech Republic.
| | - Aleš Růžička
- Department of General and Inorganic Chemistry, University of Pardubice, 532 10 Pardubice, Czech Republic.
| | - Jiří Tydlitát
- Department of General and Inorganic Chemistry, University of Pardubice, 532 10 Pardubice, Czech Republic.
| | - Jens Beckmann
- Institut für Anorganische Chemie und Kristallographie, Universität Bremen, Leobener Straße 7, 28359 Bremen, Germany
| | - Jan Turek
- Eenheid Algemene Chemie (ALGC), Vrije Universiteit Brussel, Pleinlaan 2, 1050 Brussels, Belgium.
| | - Roman Jambor
- Department of General and Inorganic Chemistry, University of Pardubice, 532 10 Pardubice, Czech Republic.
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Dong Q, Ma Z, Hao Z, Han Z, Lin J, Lu G. Preparation of trinuclear ruthenium clusters based on piconol ligands and their application in Oppenauer‐type oxidation of secondary alcohols. Appl Organomet Chem 2021. [DOI: 10.1002/aoc.6336] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Qing Dong
- National Experimental Chemistry Teaching Center (Hebei Normal University), Hebei Key Laboratory of Organic Functional Molecules, College of Chemistry and Materials Science Hebei Normal University Shijiazhuang China
| | - Zongwen Ma
- National Experimental Chemistry Teaching Center (Hebei Normal University), Hebei Key Laboratory of Organic Functional Molecules, College of Chemistry and Materials Science Hebei Normal University Shijiazhuang China
| | - Zhiqiang Hao
- National Experimental Chemistry Teaching Center (Hebei Normal University), Hebei Key Laboratory of Organic Functional Molecules, College of Chemistry and Materials Science Hebei Normal University Shijiazhuang China
| | - Zhangang Han
- National Experimental Chemistry Teaching Center (Hebei Normal University), Hebei Key Laboratory of Organic Functional Molecules, College of Chemistry and Materials Science Hebei Normal University Shijiazhuang China
| | - Jin Lin
- National Experimental Chemistry Teaching Center (Hebei Normal University), Hebei Key Laboratory of Organic Functional Molecules, College of Chemistry and Materials Science Hebei Normal University Shijiazhuang China
| | - Guo‐Liang Lu
- Auckland Cancer Society Research Centre, Faculty of Medical and Health Sciences The University of Auckland Auckland New Zealand
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