14 1. Suggest a reason why this might be considered a good point for a first disconnection. II. Fragments 14 and 15 could be connected through an amide bond formation using DCC and a base (NEt) as the reagents. Provide a mechanism for this reactlon, (Hint: Use the general structures R'-NH2 and R2-CO2H to save drawing out the ful struc lures.)

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Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
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Chapter1: Chemical Foundations
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Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...
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Please answer the ii part only.

(a) in a recent sy nthesis of the cyclic peptide 13, which has antibiotic activity, the authors
chose the disconnection point illustrated in the retrosynthetlc scheme below, to give
two protected fragments 14 and 15.
HN
HN
но
NH HN
OH
13
NH
N C N
ocC, NE,
HN
DCC
HN
QMOM
HN.
15
NH HN
14
I. Suggest a reason why this might be considered a good point for a first
disconnection.
II, Fragments 14 and 15 could be connected through an amide bond formation using
DCC and a base (NEt,) as the reagents., Provide a mechanism for this reactlon,
(Hint: Use the general structures R'-NH2 and R².CO2H lo save drawing out the full
struc tures.)
Transcribed Image Text:(a) in a recent sy nthesis of the cyclic peptide 13, which has antibiotic activity, the authors chose the disconnection point illustrated in the retrosynthetlc scheme below, to give two protected fragments 14 and 15. HN HN но NH HN OH 13 NH N C N ocC, NE, HN DCC HN QMOM HN. 15 NH HN 14 I. Suggest a reason why this might be considered a good point for a first disconnection. II, Fragments 14 and 15 could be connected through an amide bond formation using DCC and a base (NEt,) as the reagents., Provide a mechanism for this reactlon, (Hint: Use the general structures R'-NH2 and R².CO2H lo save drawing out the full struc tures.)
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