Chapter 29: Q65. (page 1197)
Draw the mechanism for the reaction that removes an Fmoc group from an amino acid under the following conditions:
Chapter 29: Q65. (page 1197)
Draw the mechanism for the reaction that removes an Fmoc group from an amino acid under the following conditions:
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Clopidogrel 10-camphorsulfonic acid
What steps are needed to convert A to L-dopa, an uncommon amino acid that is effective in treating Parkinson’s disease? These steps are the key reactions in the first commercial asymmetric synthesis using a chiral transition metal catalyst. This process was developed at Monsanto in 1974.
Draw the structure of leu-enkephalin, a pentapeptide that acts as an analgesic and opiate, and has the following sequence: Tyr–Gly–Gly–Phe–Leu. (The structure of a related peptide, met-enkephalin,
appeared in Section 22.6B.)
a. Draw the structure of the tripeptide A-A-A, and label the two ionizable functional groups.
b. What is the predominant form of A-A-A at pH=1?
c. The values for the two ionizable functional groups (3.39 and 8.03) differ considerably from the values of alanine (2.35 and 9.87;see table 29.1). Account for the observed differences.
The fibroin proteins found in silk fibers consist of large regions of β-pleated sheets stacked one on top of another. (a) Explain why having a glycine at every other residue allows the β-pleated sheets to stack on top of each other. (b) Why are silk fibers insoluble in water?
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