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Besides the Petasis or the Ugi reaction, the Strecker reaction might be relevant for the synthesis of α-amino acids through preliminary preparation of α-aminonitriles. For some exemples, see
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The Petasis reaction leads to α-amino acids with high yields. However, reaction times are generally important, and the reaction does not tolerate the presence of some electron-withdrawing groups connected to phenyl moieties. The Ugi reaction requires the use of cleavable isocyanides and a further hydrolysis step
-
The Petasis reaction leads to α-amino acids with high yields. However, reaction times are generally important, and the reaction does not tolerate the presence of some electron-withdrawing groups connected to phenyl moieties. The Ugi reaction requires the use of cleavable isocyanides and a further hydrolysis step.
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55
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77950997315
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Organozinc reagents are alkaline compounds
-
Organozinc reagents are alkaline compounds.
-
-
-
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56
-
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77950997628
-
-
It was mentioned in previous works that at least 2 equiv of the organozinc compound are required for the reaction to proceed efficiently
-
It was mentioned in previous works that at least 2 equiv of the organozinc compound are required for the reaction to proceed efficiently.
-
-
-
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57
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77951010913
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Although an exothermic reaction tends to develop, the temperature of the medium was not controlled. As a consequence, this rise of the medium temperature is sufficient to avoid a preliminary heating of ethyl glyoxylate (which is generally known to require a depolymerization step prior to use)
-
Although an exothermic reaction tends to develop, the temperature of the medium was not controlled. As a consequence, this rise of the medium temperature is sufficient to avoid a preliminary heating of ethyl glyoxylate (which is generally known to require a depolymerization step prior to use).
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60
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77950983951
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Piperazine derivatives generally furnish coupling products in lower yields. This behavior has already been observed in other studies conducted in our laboratory
-
Piperazine derivatives generally furnish coupling products in lower yields. This behavior has already been observed in other studies conducted in our laboratory.
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