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Volumn 130, Issue 50, 2008, Pages 16858-16860

Pyridinium 1,1′-binaphthyl-2,2′-disulfonates as highly effective chiral Brønsted acid-base combined salt catalysts for enantioselective mannich-type reaction

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EID: 58049202980     PISSN: 00027863     EISSN: None     Source Type: Journal    
DOI: 10.1021/ja806875c     Document Type: Article
Times cited : (163)

References (71)
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    • Terada and co-workers reported the pioneering catalytic enantioselective direct Mannich-type reaction by using chiral BINOL-derived phosphoric acids. In their catalytic enantioselective reactions, acetylacetone (7a) was the sole nucleophile. Moreover, N-Boc protection in aldimines is essential for achieving high enantioselectivities. (a) Uraguchi, D.; Terada, M. J. Am. Chem. Soc. 2004, 126, 5356.
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    • Compound 5 is commercially available from International Laboratory
    • Compound 5 is commercially available from International Laboratory, Interchim, and WaterstoneTech.
    • Interchim, and WaterstoneTech
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    • In the original literature in ref 11, the Newman-Kwart rearrangement of 3 to 4 was examined at 285-400°C. Moreover, during the preparation of this manuscript, a 1-400 kg-scale synthesis of aryl S-thiocarbamates from aryl O-thiocarbamates in microwave reactors was reported by Moseley and co-workers. The industrial synthesis of 1 should be a great advantage. (a) Moseley, J. D.; Lenden, P.; Lockwood, M.; Ruda, K.; Sherlock, J.-P.; Thomson, A. D.; Gilday, J. P. Org. Process Res. Dev. 2008, 12, 30.
    • In the original literature in ref 11, the Newman-Kwart rearrangement of 3 to 4 was examined at 285-400°C. Moreover, during the preparation of this manuscript, a 1-400 kg-scale synthesis of aryl S-thiocarbamates from aryl O-thiocarbamates in microwave reactors was reported by Moseley and co-workers. The industrial synthesis of 1 should be a great advantage. (a) Moseley, J. D.; Lenden, P.; Lockwood, M.; Ruda, K.; Sherlock, J.-P.; Thomson, A. D.; Gilday, J. P. Org. Process Res. Dev. 2008, 12, 30.
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    • 3,3′-Bis[4-(β-naphthyl)phenyl]-substituted chiral binaphthol phosphoric acid catalyst, which was proved to be the most effective in direct Mannich-type reaction by Terada and co-workers, was prepared from (R)-BINOL in 31% over seven steps. See ref 7. Also see; Wipf, P, Jung, J.-K. J. Org. Chem. 2000, 65, 6319
    • 3,3′-Bis[4-(β-naphthyl)phenyl]-substituted chiral binaphthol phosphoric acid catalyst, which was proved to be the most effective in direct Mannich-type reaction by Terada and co-workers, was prepared from (R)-BINOL in 31% over seven steps. See ref 7. Also see; Wipf, P.; Jung, J.-K. J. Org. Chem. 2000, 65, 6319.
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    • To understand the character of our catalysts, we also examined some reactions by using the Terada's chiral phosphoric acid catalyst. See the Supporting Information in detail.
    • To understand the character of our catalysts, we also examined some reactions by using the Terada's chiral phosphoric acid catalyst. See the Supporting Information in detail.
  • 69
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    • 2 even if there is a large amount of 2 relative to 1 (see eq 1 and Table 2).
    • 2 even if there is a large amount of 2 relative to 1 (see eq 1 and Table 2).
  • 71
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    • 1,1′-Binaphthyl-2,2′-dicarboxylic acid-22 (5 mol , showed low catalytic activity and low enantioselectivity (<10% ee) in the reactions in Table 3, Scheme 3, and eq 2. Also see ref 6j
    • 2 (5 mol %) showed low catalytic activity and low enantioselectivity (<10% ee) in the reactions in Table 3, Scheme 3, and eq 2. Also see ref 6j.


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