Which of the Following Tripeptides Is Formed When Serine Is

question 85

Multiple Choice

Which of the following tripeptides is formed when serine is treated with (BoC) ₂O and threonine is treated with benzyl alcohol/acid first and the resulting intermediates are reacted in the presence of DCC followed by treatment with aqueous NaOH. The dipeptide is then reacted with the benzyl ester of isoleucine in the presence of DCC followed by treatment with trifluoroacetic acid and then aqueous NaOH?

• A) Ser-Tyr-Ile
• B) Ser-Thr-Ile
• C) Ile-Ser-Thr
• D) Ile-Ser-Tyr
• E) none of these

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