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During the preparation of this paper, Terada also reported the reaction between β,γ-unsaturated α-keto esters and for oxazolones using axially chiral guanidine catalysts. Their system requires a low reaction temperature (-60 °C) and enantioselectivities for most substrates do not exceed 90% ee:
-
During the preparation of this paper, Terada also reported the reaction between β,γ-unsaturated α-keto esters and for oxazolones using axially chiral guanidine catalysts. Their system requires a low reaction temperature (-60 °C) and enantioselectivities for most substrates do not exceed 90% ee: Chem. - Eur. J. 2011, 17, 1760.
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78
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note
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-3. CCDC 806009 contains the supplementary crystallographic data for 3p. These data can be obtained free of charge from the Cambridge Crystallographic Data center via www.ccdc.cam.ac.uk/data-request/cif.
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79
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79954994821
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Our results and Feng's implies that the use of bifunctional catalysts might favor the IEDDA mechanism. In Ref. 11, where guanidine was used as the catalyst, good-to-excellent diastereoselectivities were observed and the authors preferred route I based on some experimental studies
-
Our results and Feng's implies that the use of bifunctional catalysts might favor the IEDDA mechanism. In Ref. 11, where guanidine was used as the catalyst, good-to-excellent diastereoselectivities were observed and the authors preferred route I based on some experimental studies.
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