Question: (a) Isoleucine has been prepared by the following sequence of reactions. Give the structure of compounds A through D isolated as intermediates in this synthesis.

(a) Isoleucine has been prepared by the following sequence of reactions. Give the structure of compounds A through D isolated as intermediates in this synthesis.

(b) An analogous procedure has been used to prepare phenylalanine. What alkyl halide would you choose as the starting material for this synthesis?

diethylm IonutALN) B (CH204) I. KOH sodium ethoxide 2. HCI Br B Bly C (CHI IBrO4) D-isoleucine (racemic) NHy H2O heat

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