http://www.cnr.it/ontology/cnr/individuo/prodotto/ID16658
1,4-Diazabicyclo[2.2.2]octane (DABCO) as an Efficient Reagent for the Synthesis of Isoxazole Derivatives from Primary Nitro Compounds and Dipolarophiles: the Role of the Base (Articolo in rivista)
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- 1,4-Diazabicyclo[2.2.2]octane (DABCO) as an Efficient Reagent for the Synthesis of Isoxazole Derivatives from Primary Nitro Compounds and Dipolarophiles: the Role of the Base (Articolo in rivista) (literal)
- Anno
- 2006-01-01T00:00:00+01:00 (literal)
- Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi
- 10.1002/ejoc.200600475 (literal)
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Cecchi Luca; De Sarlo Francesco; Machetti Fabrizio (2006)
1,4-Diazabicyclo[2.2.2]octane (DABCO) as an Efficient Reagent for the Synthesis of Isoxazole Derivatives from Primary Nitro Compounds and Dipolarophiles: the Role of the Base
in European journal of organic chemistry (Print); WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim (Germania)
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- Cecchi Luca; De Sarlo Francesco; Machetti Fabrizio (literal)
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- http://onlinelibrary.wiley.com/doi/10.1002/ejoc.200600475/abstract (literal)
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- istituto di Chimica dei composti organometallici del CNR
Dipartimento di Chimica Organica U. Schiff dell'Università di Firenze (literal)
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- 1,4-Diazabicyclo[2.2.2]octane (DABCO) as an Efficient Reagent for the Synthesis of Isoxazole Derivatives from Primary Nitro Compounds and Dipolarophiles: the Role of the Base (literal)
- Abstract
- The dehydration of primary nitro compounds can be performed by bases in the presence of dipolarophiles. The reactivity of several tertiary amines or azaheteroaromatic compounds containing one or two basic centres is shown to be related to the ability of the protonated base to establish H-bonded ion pairs with the adduct that is formed from the nitronate and the dipolarophile in chloroform. Among the organic bases examined, caged tertiary diamine 1,4-diazabicyclo[2.2.2]octane (DABCO) gave the best results. The reaction is applicable to activated nitro compounds and to phenylnitromethane and affords isoxazoline derivatives in higher yields compared with those of other methods. The reaction, however, is not compatible with nitroalkanes. The proposed mechanism of the reaction is based on the collapse of the H-bonded ion pair. (literal)
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