Question
With suitable examples, discuss the control of enantioselectivity in alkylation reactions.
Answer :
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Enantioselectivity in alkylation reactions refers to the preferential formation of one enantiomer over the other when a prochiral substrate undergoes nucleophilic substitution or addition. Controlling enantioselectivity is essential in organic synthesis, particularly for producing biologically active compounds, as enantiomers often exhibit drastically different pharmacological properties. One common strategy involves the use of chiral auxiliaries, chiral ligands, or chiral catalysts to induce asymmetry during the reaction. A classic example is the use of chiral lithium amide bases in the alkylation of prochiral enolates. For instance, in the
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