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33750525324
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note
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2 derivatives. Amino alcohols 3 and 4 were obtained by reduction of the corresponding mandelic amides. Amino alcohol 5 was a generous gift from Dr. William Nugent.
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32
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29344448052
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33750515687
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-
note
-
The reaction was repeated several times under nitrogen, giving, in some cases, good yield, while in other cases low conversion was observed. Also the enantiomeric excess was erratic. Probably, the presence or of the absence of adventitious traces of oxygen were responsible for this irreproducible behavior.
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-
-
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41
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33750509642
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note
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[7].
-
-
-
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42
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33750512985
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note
-
Unfortunately, it was not possible to improve the ee with cinnamic aldehyde by performing the reaction at low temperature due to solubility problems.
-
-
-
-
43
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33750508768
-
-
note
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Pivalaldehyde was not a reactive substrate even if the reaction was performed at room temperature.
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44
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33750501163
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58
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33750496626
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note
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We thank a reviewer for drawing our attention to this important problem.
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-
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59
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33750509861
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note
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PhCHO gives quantitative yield and 30% ee in the Reformatsky reaction promoted by 20 mol% of N-methylephedrine, with ethyl iodoacetate and air as promoter. We are now optimizing the conditions and suitable ligands for an effective catalytic enantioselective Reformatsky reaction with aldehydes.
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