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If one considers that a p-methoxystyrene is a trienol system and that reactions of enols with imines are termed Mannich reactions, then the reaction described in this report could be considered a vinylogous Mannich reaction. However, this term is currently employed by Martin to illustrate the nucleophilic addition of 2-trialkylsiloxy furans to cyclic iminium ions; cf. Martin, S. F. et al. J. Am. Chem. Soc. 1996, 118, 3299 and Martin, S. F. et al. J. Am. Chem. Soc. 1999, 121, 6990. It should also be noted that Overman has described a related intramolecular Mannich reaction; cf. Loegers, M. et al. J. Am. Chem. Soc. 1995, 117, 9139 and references cited therein.
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0033523222
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If one considers that a p-methoxystyrene is a trienol system and that reactions of enols with imines are termed Mannich reactions, then the reaction described in this report could be considered a vinylogous Mannich reaction. However, this term is currently employed by Martin to illustrate the nucleophilic addition of 2-trialkylsiloxy furans to cyclic iminium ions; cf. Martin, S. F. et al. J. Am. Chem. Soc. 1996, 118, 3299 and Martin, S. F. et al. J. Am. Chem. Soc. 1999, 121, 6990. It should also be noted that Overman has described a related intramolecular Mannich reaction; cf. Loegers, M. et al. J. Am. Chem. Soc. 1995, 117, 9139 and references cited therein.
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0029082653
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and references cited therein
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If one considers that a p-methoxystyrene is a trienol system and that reactions of enols with imines are termed Mannich reactions, then the reaction described in this report could be considered a vinylogous Mannich reaction. However, this term is currently employed by Martin to illustrate the nucleophilic addition of 2-trialkylsiloxy furans to cyclic iminium ions; cf. Martin, S. F. et al. J. Am. Chem. Soc. 1996, 118, 3299 and Martin, S. F. et al. J. Am. Chem. Soc. 1999, 121, 6990. It should also be noted that Overman has described a related intramolecular Mannich reaction; cf. Loegers, M. et al. J. Am. Chem. Soc. 1995, 117, 9139 and references cited therein.
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Refer to ref 4.
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0042801519
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note
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Similar temperature affects have been observed in the Pictet - Spengler reaction of tryptamines carried out in nonacidic, aprotic media; cf. ref 7c.
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