ORGANIC CHEMISTRY GGC>CUSTOM<-TEXT
2nd Edition
ISBN: 9781119288510
Author: Klein
Publisher: WILEY
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Question
Chapter 25.6, Problem 6LTS
Interpretation Introduction
Interpretation:
Ile-Gly-Leu-Ala-Phe was synthesized using Merrifield synthesis and the steps used for the synthesis has to be identified.
Concept introduction:
Peptides can be synthesized in more yield by using the method developed by R. Bruce Merrifield. A peptide containing a large number of amino acid residue can be synthesized easily by this method. The coupling of the amino acid residues are done without purification. The key steps involved in Merrifield Synthesis are,
- Attachment of Boc-protected residue to
polymer . - Removal of Boc Protecting group.
- Coupling with another Boc-protected amino acid using DCC.
- For each amino acid that is added to the growing peptide chain removal of Boc and coupling is done.
- Removal of Boc and detachment of peptide from the polymer.
To identify: all the steps used to prepare Ile-Gly-Leu-Ala-Phe via Merrifield synthesis.
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C. I, II, III
Consider the reaction sequence below to answer the following questions:
0
0
1. NaOEt, EtOH
ΕΙΟ
OEt
2
Compound X
CO₂Et
NaOEt, EtOH
CO₂Et
Br
Compound Y
A
Compound Z
A. Compound X, diethyl propanedioate, is more commonly known as
a. ethyl acetoacetate
acetoacetic ester
b.
C.
oxalic ester
d. malonic ester
B. Write the complete stepwise mechanism for the conversion of Compound X into Compound Y.
Show all electron flow with arrows and draw all intermediate structures.
Diethyl malonate can be prepared by the following reaction sequence. Draw the structures of each of
the missing intermediates in the boxes provided
EtO
0
H3C
11
C
1. Br₂ PBr
OH 2 H₂O
010
0
CH3CH₂OH
C
CH2
OEt
Ha
CH3CH2OH
на
NaCN
H₂SO4
NC
H₂O, heat
CH2
OCH2CH3
Chapter 25 Solutions
ORGANIC CHEMISTRY GGC>CUSTOM<-TEXT
Ch. 25.2 - Prob. 1CCCh. 25.2 - Prob. 2CCCh. 25.2 - Prob. 3CCCh. 25.2 - Prob. 1LTSCh. 25.2 - Prob. 4PTSCh. 25.2 - Prob. 5ATSCh. 25.2 - Prob. 6ATSCh. 25.2 - Prob. 7CCCh. 25.2 - Prob. 8CCCh. 25.2 - Prob. 9CC
Ch. 25.2 - Prob. 10CCCh. 25.3 - Prob. 11CCCh. 25.3 - Prob. 12CCCh. 25.3 - Prob. 13CCCh. 25.3 - Prob. 2LTSCh. 25.3 - Prob. 14PTSCh. 25.3 - Prob. 15ATSCh. 25.3 - Prob. 16ATSCh. 25.3 - Prob. 17CCCh. 25.3 - Prob. 18CCCh. 25.3 - Prob. 19CCCh. 25.3 - Prob. 20CCCh. 25.4 - Prob. 3LTSCh. 25.4 - Prob. 21PTSCh. 25.4 - Prob. 22ATSCh. 25.4 - Prob. 23ATSCh. 25.4 - Prob. 24ATSCh. 25.4 - Prob. 25CCCh. 25.4 - Prob. 26CCCh. 25.4 - Prob. 27CCCh. 25.4 - Prob. 28CCCh. 25.4 - Prob. 29CCCh. 25.5 - Prob. 30CCCh. 25.5 - Prob. 4LTSCh. 25.5 - Prob. 31PTSCh. 25.5 - Prob. 32ATSCh. 25.5 - Prob. 33ATSCh. 25.6 - Prob. 5LTSCh. 25.6 - Prob. 34PTSCh. 25.6 - Prob. 35ATSCh. 25.6 - Prob. 36ATSCh. 25.6 - Prob. 6LTSCh. 25.6 - Prob. 37PTSCh. 25.6 - Prob. 38PTSCh. 25.7 - Prob. 39CCCh. 25 - Prob. 40PPCh. 25 - Prob. 41PPCh. 25 - Prob. 42PPCh. 25 - Prob. 43PPCh. 25 - Prob. 44PPCh. 25 - Prob. 45PPCh. 25 - Prob. 46PPCh. 25 - Prob. 47PPCh. 25 - Prob. 48PPCh. 25 - Prob. 49PPCh. 25 - Prob. 50PPCh. 25 - Prob. 51PPCh. 25 - Prob. 52PPCh. 25 - Prob. 53PPCh. 25 - Prob. 54PPCh. 25 - Prob. 55PPCh. 25 - Prob. 56PPCh. 25 - Prob. 57PPCh. 25 - Prob. 58PPCh. 25 - Prob. 59PPCh. 25 - Prob. 60PPCh. 25 - Prob. 61PPCh. 25 - Prob. 62PPCh. 25 - Prob. 63PPCh. 25 - Prob. 64PPCh. 25 - Prob. 65PPCh. 25 - Prob. 66PPCh. 25 - Prob. 67PPCh. 25 - Prob. 68PPCh. 25 - Prob. 69PPCh. 25 - Prob. 70PPCh. 25 - Prob. 71PPCh. 25 - Prob. 72PPCh. 25 - Prob. 73PPCh. 25 - Prob. 74PPCh. 25 - Prob. 75PPCh. 25 - Prob. 76PPCh. 25 - Prob. 77PPCh. 25 - Prob. 78PPCh. 25 - Prob. 79PPCh. 25 - Prob. 80PPCh. 25 - Prob. 81PPCh. 25 - Prob. 82PPCh. 25 - Prob. 83PPCh. 25 - Prob. 84IPCh. 25 - Prob. 85IPCh. 25 - Prob. 86IPCh. 25 - Prob. 87IP
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