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Volumn 73, Issue 3, 2008, Pages 963-973

Polar hetero-Diels-Alder reactions of 4-alkenylthiazoles with 1,2,4-triazoline-3,5-diones: An experimental and computational study

Author keywords

[No Author keywords available]

Indexed keywords

COMPUTATIONAL METHODS; ENERGY BARRIERS; REACTION KINETICS; STEREOCHEMISTRY; SUBSTITUTION REACTIONS;

EID: 84962343716     PISSN: 00223263     EISSN: None     Source Type: Journal    
DOI: 10.1021/jo7021668     Document Type: Article
Times cited : (24)

References (121)
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    • The synthesis of 4-alkenylthiazoles 1a-d has been reported previously by the authors, see ref. 4.
    • The synthesis of 4-alkenylthiazoles 1a-d has been reported previously by the authors, see ref. 4.
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    • These compounds were obtained from the reaction of dienes 1 with N-substituted maleimides in acetonitrile at 120°C, see ref 4
    • These compounds were obtained from the reaction of dienes 1 with N-substituted maleimides in acetonitrile at 120°C, see ref 4.
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    • Although steric effects depend so much upon the precise direction from which a reagent approaches that there can be no single scale for evaluating the effective size of a group, we assume that H < Me < Ph, see: Fleming, I, Lewis, J. J. J. Chem. Soc, Chem. Commun. 1985, 149-151
    • Although steric effects depend so much upon the precise direction from which a reagent approaches that there can be no single scale for evaluating the effective size of a group, we assume that H < Me < Ph, see: Fleming, I.; Lewis, J. J. J. Chem. Soc., Chem. Commun. 1985, 149-151.
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    • These steric requirements are based on A values, see: McGarvey, G. J.; Williams, J. M. J. Am. Chem. Soc. 1985, 107, 1435-1437.
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    • These indexes also have been used to characterize cycloaddition reactions other than [4+2], see for example: Lecea, B.; Ayerbe, M.; Arrieta, A.; Cossío, F. P.; Branchadell, V.; Ortuño, R. M.; Baceiredo, A. J. Org. Chem. 2007, 72, 357-366.
    • (c) These indexes also have been used to characterize cycloaddition reactions other than [4+2], see for example: Lecea, B.; Ayerbe, M.; Arrieta, A.; Cossío, F. P.; Branchadell, V.; Ortuño, R. M.; Baceiredo, A. J. Org. Chem. 2007, 72, 357-366.
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    • Whereas in exo-TS3a the more advanced forming bond is C5-N, in exo-TS3b it is the C1-N bond. We have located another exo transition state for the reaction of HTAD with 13b where the more advanced forming bond is C5-N, but it is higher in energy than exo-TS3b, see the Supporting Information. In contrast, for the reaction of HTAD with 13a we have only found one exo transition state, exo-TS3a
    • Whereas in exo-TS3a the more advanced forming bond is C5-N, in exo-TS3b it is the C1-N bond. We have located another exo transition state for the reaction of HTAD with 13b where the more advanced forming bond is C5-N, but it is higher in energy than exo-TS3b, see the Supporting Information. In contrast, for the reaction of HTAD with 13a we have only found one exo transition state, exo-TS3a.
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    • A similar difference in the degree of twisting has been reported by Houk for the endo and exo transition states computed for the Diels-Alder reaction of HTAD with butadiene, see ref 13a
    • A similar difference in the degree of twisting has been reported by Houk for the endo and exo transition states computed for the Diels-Alder reaction of HTAD with butadiene, see ref 13a.
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    • Compare with the values of the global electrophilicity indexes of strong electrophiles in ref 48
    • Compare with the values of the global electrophilicity indexes of strong electrophiles in ref 48.
  • 121
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    • Thiazole 7a was obtained with minor impurities after purification by column chromatography. It was used for the next step without further purification. The NMR spectra shown in the Supporting Information were obtained from a first fraction obtained in a second chromatography.
    • Thiazole 7a was obtained with minor impurities after purification by column chromatography. It was used for the next step without further purification. The NMR spectra shown in the Supporting Information were obtained from a first fraction obtained in a second chromatography.


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