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Isomerization of allylic alcohols into carbonyl compounds: (a) Cadierno, V.; García-Garrido, S. E.; Gimeno, J. Chem. Commun. 2004, 232.
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Reduction of allylic alcohols into saturated alcohols; (f) Cadierno, V.; Francos, J.; Gimeno, J.; Nebra, N. Chem. Commun. 2007, 2536.
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Cycloisomerization of (Z)-enynols into furans: (g) Díaz- Álvarez, A. E.; Crochet, P.; Zablocka, M.; Duhayon, C.; Cadierno, V.; Gimeno, J.; Majoral, J. P. Adv. Synth. Catal. 2006, 348, 1671.
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Cycloisomerization of (Z)-enynols into furans: (g) Díaz- Álvarez, A. E.; Crochet, P.; Zablocka, M.; Duhayon, C.; Cadierno, V.; Gimeno, J.; Majoral, J. P. Adv. Synth. Catal. 2006, 348, 1671.
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Intermolecular [2 + 2 + 2] alkyne cyclotrimerizations: (i) Cadierno, V.; García-Garrido, S. E.; Gimeno, J. J. Am. Chem. Soc. 2006, 128, 15094.
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Selective deprotection of N-allylic amines, amides, and lactams: (m) Cadierno, V.; García-Garrido, S. E.; Gimeno, J.; Nebra, N. Chem. Commun. 2005, 4086.
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We note that when a primary amine is introduced in the reaction media pyrroles instead of furans are selectively formed: (a) Cadierno, V.; Gimeno, J.; Nebra, N. Chem. Eur. J. 2007, 13, 9973.
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45
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33645069129
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Brønsted acid catalyzed propargylations of several organic substrates, including 1,3-dicarbonyl compounds, with alkynols have been reported: (a) Sanz, R.; Martínez, A.; Álvarez-Gutiérrez; J. M.; Rodríguez, F. Eur. J. Org. Chem. 2006, 1383.
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Brønsted acid catalyzed propargylations of several organic substrates, including 1,3-dicarbonyl compounds, with alkynols have been reported: (a) Sanz, R.; Martínez, A.; Álvarez-Gutiérrez; J. M.; Rodríguez, F. Eur. J. Org. Chem. 2006, 1383.
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Yadav, J. S.; Reddy, B. V. S.; Rao, T. S.; Krishna, B. B. M.; Kumar, G. G. K. S. N. Chem. Lett. 2007, 36, 1472. In these works only 5 mol % of the acid is required to promote efficiently the propargylation process. In our case the use of larger quantities of TFA (50 mol %) is imperative in order to avoid the Meyer-Schuster isomerization of the propargylic alcohol catalyzed by the ruthenium complex 1. See refs 4k and 41.
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(d) Yadav, J. S.; Reddy, B. V. S.; Rao, T. S.; Krishna, B. B. M.; Kumar, G. G. K. S. N. Chem. Lett. 2007, 36, 1472. In these works only 5 mol % of the acid is required to promote efficiently the propargylation process. In our case the use of larger quantities of TFA (50 mol %) is imperative in order to avoid the Meyer-Schuster isomerization of the propargylic alcohol catalyzed by the ruthenium complex 1. See refs 4k and 41.
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49
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48249156465
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In our previous work involving acyclic 1,3-dicarbonyl compounds (ref 6, the catalytic reactions were performed under solvent-free conditions, employing the 1,3-dicarbonyl compound (10 equiv with respect to the alkynol) itself as solvent. In order to avoid the waste of expensive reagents, we decided to reduce the quantity of the 1,3-diketone 1 equiv per equivalent of the alkynol, dissolving all the components of the catalytic reaction in the minimum amount of tetrahydrofuran
-
In our previous work involving acyclic 1,3-dicarbonyl compounds (ref 6), the catalytic reactions were performed under "solvent-free" conditions, employing the 1,3-dicarbonyl compound (10 equiv with respect to the alkynol) itself as solvent. In order to avoid the waste of expensive reagents, we decided to reduce the quantity of the 1,3-diketone (1 equiv per equivalent of the alkynol), dissolving all the components of the catalytic reaction in the minimum amount of tetrahydrofuran.
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We note that such a reaction pathway is proposed in the closely related metal-catalyzed cyclizations of (Z)-enynols into furans. See, for example: (a) Seiller, B, Bruneau, C, Dixneuf, P. H. Tetrahedron 1995, 51, 13089
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We note that such a reaction pathway is proposed in the closely related metal-catalyzed cyclizations of (Z)-enynols into furans. See, for example: (a) Seiller, B.; Bruneau, C.; Dixneuf, P. H. Tetrahedron 1995, 51, 13089.
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No cyclizative C-C coupling reactions between alkynols and 1,3-cyclohexanediones have been reported. See, for example: (a) Gabbutt, C. D.; Hepworth, J. D.; Heron, B. M.; Partington, S. M.; Thomas, D. A. Dyes Pigm. 2001, 49, 65.
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Transformation of terminal propargylic alcohols into allenylidene ligands in the coordination sphere of transition metals is a well-known process. For reviews on this topic, see: (a) Bruce, M. I. Chem. Rev. 1998, 98, 2797.
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Such a reaction pathway involving vinylidene intermediates is in complete accord with recent stoichiometric studies performed with mononuclear allenylidene-ruthenium(II) complexes containing the electron-rich fragment [Cp*Ru(dippe, a) Bustelo, E, Jiménez-Tenorio, M, Puerta, M. C, Valerga, P. Organometallics 2007, 26, 4300
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+: (a) Bustelo, E.; Jiménez-Tenorio, M.; Puerta, M. C.; Valerga, P. Organometallics 2007, 26, 4300.
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