Amino acids can also be prepared by a two-step sequence that involves hell? Volhard?Zelinskii reaction of a

Question:

Amino acids can also be prepared by a two-step sequence that involves hell? Volhard?Zelinskii reaction of a carboxylic acid followed by treatment with ammonia. Show how you would prepare Leucine, (CH₃)₂ CHCH₂CH (NH₂) CO₂H, and identify the mechanism of the second step.