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Dell'Aera M, Perna FM, Vitale P, Altomare A, Palmieri A, Maddock LCH, Bole LJ, Kennedy AR, Hevia E, Capriati V. Boosting Conjugate Addition to Nitroolefins Using Lithium Tetraorganozincates: Synthetic Strategies and Structural Insights. Chemistry 2020; 26:8742-8748. [PMID: 32181938 DOI: 10.1002/chem.202001294] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/15/2020] [Indexed: 11/09/2022]
Abstract
We report the first transition metal catalyst- and ligand-free conjugate addition of lithium tetraorganozincates (R4 ZnLi2 ) to nitroolefins. Displaying enhanced nucleophilicity combined with unique chemoselectivity and functional group tolerance, homoleptic aliphatic and aromatic R4 ZnLi2 provide access to valuable nitroalkanes in up to 98 % yield under mild conditions (0 °C) and short reaction time (30 min). This is particularly remarkable when employing β-nitroacrylates and β-nitroenones, where despite the presence of other electrophilic groups, selective 1,4 addition to the C=C is preferred. Structural and spectroscopic studies confirmed the formation of tetraorganozincate species in solution, the nature of which has been a long debated issue, and allowed to unveil the key role played by donor additives on the aggregation and structure of these reagents. Thus, while chelating N,N,N',N'-tetramethylethylenediamine (TMEDA) and (R,R)-N,N,N',N'-tetramethyl-1,2-diaminocyclohexane (TMCDA) favour the formation of contacted-ion pair zincates, macrocyclic Lewis donor 12-crown-4 triggers an immediate disproportionation process of Et4 ZnLi2 into equimolar amounts of solvent-separated Et3 ZnLi and EtLi.
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Affiliation(s)
- Marzia Dell'Aera
- Dipartimento di Farmacia-Scienze del Farmaco, Università di Bari "A. Moro", Consorzio C.I.N.M.P.I.S., Via E. Orabona 4, 70125, Bari, Italy.,Istituto di Cristallografia (IC-CNR), Via Amendola 122/o, 70125, Bari, Italy
| | - Filippo Maria Perna
- Dipartimento di Farmacia-Scienze del Farmaco, Università di Bari "A. Moro", Consorzio C.I.N.M.P.I.S., Via E. Orabona 4, 70125, Bari, Italy
| | - Paola Vitale
- Dipartimento di Farmacia-Scienze del Farmaco, Università di Bari "A. Moro", Consorzio C.I.N.M.P.I.S., Via E. Orabona 4, 70125, Bari, Italy
| | - Angela Altomare
- Istituto di Cristallografia (IC-CNR), Via Amendola 122/o, 70125, Bari, Italy
| | - Alessandro Palmieri
- School of Science and Technology, Chemistry Division, University of Camerino, Via S. Agostino 1, 62032, Camerino, Italy
| | - Lewis C H Maddock
- Department of Pure and Applied Chemistry, University of Strathclyde Glasgow, G1 1XL, Glasgow, UK
| | - Leonie J Bole
- Department für Chemie und Biochemie, Universität Bern, 3012, Bern, Switzerland
| | - Alan R Kennedy
- Department of Pure and Applied Chemistry, University of Strathclyde Glasgow, G1 1XL, Glasgow, UK
| | - Eva Hevia
- Department für Chemie und Biochemie, Universität Bern, 3012, Bern, Switzerland
| | - Vito Capriati
- Dipartimento di Farmacia-Scienze del Farmaco, Università di Bari "A. Moro", Consorzio C.I.N.M.P.I.S., Via E. Orabona 4, 70125, Bari, Italy.,Dipartimento di Chimica, Istituto di Chimica dei Composti Organometallici (ICCOM)-CNR, Università di Bari "A. Moro", Via E. Orabona 4, 70125, Bari, Italy
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Dumez E, Durand AC, Guillaume M, Roger PY, Faure R, Pons JM, Herbette G, Dulcère JP, Bonne D, Rodriguez J. Michael Addition Initiated Carbocyclization Sequences with Nitroolefins for the Stereoselective Synthesis of Functionalized Heterocyclic and Carbocyclic Systems. Chemistry 2009; 15:12470-88. [DOI: 10.1002/chem.200901433] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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Kondo T, Takagi D, Tsujita H, Ura Y, Wada K, Mitsudo TA. Highly selective dimerization of styrenes and linear co-dimerization of styrenes with ethylene catalyzed by a ruthenium complex. Angew Chem Int Ed Engl 2007; 46:5958-61. [PMID: 17592607 DOI: 10.1002/anie.200701583] [Citation(s) in RCA: 44] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Teruyuki Kondo
- Department of Energy and Hydrocarbon Chemistry, Graduate School of Engineering, Kyoto University, Kyoto 615-8510, Japan.
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Kondo T, Takagi D, Tsujita H, Ura Y, Wada K, Mitsudo TA. Highly Selective Dimerization of Styrenes and Linear Co-dimerization of Styrenes with Ethylene Catalyzed by a Ruthenium Complex. Angew Chem Int Ed Engl 2007. [DOI: 10.1002/ange.200701583] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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