5. (a) Draw the Haworth projection that will result from the below Fisher projection of the aldohexose below (Hint: Thin

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5 A Draw The Haworth Projection That Will Result From The Below Fisher Projection Of The Aldohexose Below Hint Thin 1 (117.51 KiB) Viewed 278 times

5. (a) Draw the Haworth projection that will result from the below Fisher projection of the aldohexose below (Hint: Think about the orientation of the monosaccharide). (b) Draw onto the Haworth Projec- tion (template) the mechanistic electron-flow arrows for the cyclization into the pyranose ring. (c) Then draw the 4C₁ pyranose structure. CH₂OH НО -H -OH -H -H 0 H Haworth Projection (7 marks) 6. (a) In the box draw the structure of D-Cysteine-L-Glutamic acid (i.e., a dipeptide; D-Cys-L-Glu) at pH 8.0 (see Table 1); (b) Indicate on the structure whether the two chiral centers are R or S, including priorities. (6 marks) 7. Using the Amidomalonate synthesis (as shown below): what alkyl bromide would you use to pre- pare the a-amino acid Lysine (see Table 1)? The product would actually be a mixture of R and Sen- antiomers. Draw your answer inside the box for reactant 2. CO,CH,CH e = CO,CH,CHs 1. OCH₂CH3 Lysine CH3 3. H₂O/Heat + H HO HO =C HN, O