Question
How will you obtain valine using Gabriel phthalimide synthesis? Explain.
Answer :
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Prepare potassium phthalimide (phthalimide + KOH). Alkylate it with ethyl α-bromoisovalerate (ethyl 2-bromo-3-methylbutanoate) under SN2 conditions (DMF or acetone, heat, K2CO3 or KOH) to give N-(CH(R)-COOEt)phthalimide where R = isopropyl side chain of valine. Perform
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