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For examples of surfactant effect in aminocatalysis, see:
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34848866066
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note
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For general base catalysis in aqueous aminocatalysis, see: Refs. 3b and 9.
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49
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0003593821
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a=9.17. The variation of activity in different media may be rationalized by the following equilibrium, where only species I is catalytically active. (The protonation of pyrrolidinyl nitrogen in a l-prolinamide with strong acids such as p-toluenesulfonic acid leads to an inert catalyst, see:
-
a=9.17. The variation of activity in different media may be rationalized by the following equilibrium, where only species I is catalytically active. (The protonation of pyrrolidinyl nitrogen in a l-prolinamide with strong acids such as p-toluenesulfonic acid leads to an inert catalyst, see:
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(1982)
The Structure and Reaction of Heterocycle Compounds
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Palmer, M.M.1
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50
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33846921296
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a of 3-aminopyridine, whereas the use of PB buffer (pH=7.2) helps to shift the equilibrium to I, thus higher activity was achieved in this media.
-
a of 3-aminopyridine, whereas the use of PB buffer (pH=7.2) helps to shift the equilibrium to I, thus higher activity was achieved in this media.
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J. Org. Chem.
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Gryko, D.1
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34848899631
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{A figure is presented}
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-
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52
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33645915448
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It is known that 2-aminopyridine is a good molecular recognition unit for acids. It is therefore likely the complex of DBSA and catalyst 8 will geometrically facilitate protonation of pyrrolidinyl ring, resulting in exclusively formation of species II (Ref. 14), as a result totally depleting the catalytic activity of catalyst 8. For pyrrolidinyl pyridines as organocatalysts in the absence of acidic additives, see:
-
It is known that 2-aminopyridine is a good molecular recognition unit for acids. It is therefore likely the complex of DBSA and catalyst 8 will geometrically facilitate protonation of pyrrolidinyl ring, resulting in exclusively formation of species II (Ref. 14), as a result totally depleting the catalytic activity of catalyst 8. For pyrrolidinyl pyridines as organocatalysts in the absence of acidic additives, see:. Tang Z., Cun L.-F., Cui X., Mi A.-Q., Jiang Y.-Z., and Gong L.-Z. Org. Lett. 8 (2006) 1263-1266
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34848852039
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For a few of examples, see:
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33644661812
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During the work of this manuscript, Gong reported another example similar with ours, however, the reactions were carried out in organic solvent under lower (-40 °C) temperature, see:
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Liu Q., and Rovis T. J. Am. Chem. Soc. 128 (2006) 2552-2553 During the work of this manuscript, Gong reported another example similar with ours, however, the reactions were carried out in organic solvent under lower (-40 °C) temperature, see:
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Liu, Q.1
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for other examples, see: Ref. 17d
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Pihko P.M., Laurikainen K.M., Usano A., Nyberg A.I., and Kaavi J.A. Tetrahedron 62 (2006) 317-328 for other examples, see: Ref. 17d
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(2006)
Tetrahedron
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Pihko, P.M.1
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34848823533
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note
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2=0.0824 (all data).
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