26.7 Terpenes: The Isoprene Rule
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1 26.7 Terpenes: The Isoprene Rule
2 Terpenes Terpenes are natural products that are structurally related to isoprene. CH 3 H 2 C C CH CH 2 or Isoprene (2-methyl methyl-1,3-butadiene)
3 Terpenes Myrcene (isolated from oil of bayberry) is a typical terpene. CH 3 C CH 3 CHCH 2 CH 2 CCH or CH 2 CH 2
4 The Isoprene Unit An isoprene unit is the carbon skeleton of isoprene (ignoring the double bonds) Myrcene contains two isoprene units.
5 The Isoprene Unit The isoprene units of myrcene are joined "head- to-tail." tail." head tail tail head
6 Table 26.2 Classification of Terpenes Class Number of carbon atoms Monoterpene 10 Sesquiterpene 15 Diterpene 20 Sesterpene 25 Triterpene 30 Tetraterpene 40
7 Figure 26.6 Representative Monoterpenes H H α-phellandrene (eucalyptus) Menthol (peppermint) Citral (lemon grass)
8 Figure 26.6 Representative Monoterpenes H H α-phellandrene (eucalyptus) Menthol (peppermint) Citral (lemon grass)
9 Figure 26.6 Representative Monoterpenes α-phellandrene (eucalyptus) Menthol (peppermint) Citral (lemon grass)
10 Figure 26.6 Representative Sesquiterpenes H α-selinene (celery)
11 Figure 26.6 Representative Sesquiterpenes H α-selinene (celery)
12 Figure 26.6 Representative Sesquiterpenes α-selinene (celery)
13 Figure 26.6 Representative Diterpenes H Vitamin A
14 Figure 26.6 Representative Diterpenes H Vitamin A
15 Figure 26.6 Representative Diterpenes Vitamin A
16 Figure 26.6 Representative Triterpene tail-to to-tail tail linkage of isoprene units Squalene (shark liver oil)
17 26.8 Isopentenyl Pyrophosphate: The Biological Isoprene Unit
18 The Biological Isoprene Unit The isoprene units in terpenes do not come from isoprene. They come from isopentenyl pyrophosphate. Isopentenyl pyrophosphate (5 carbons) comes from acetate (2 carbons) via mevalonate (6 carbons).
19 The Biological Isoprene Unit CH 3 3CH 3 CH HCCH 2 CCH 2 CH 2 H H CH 3 Mevalonic acid H 2 C CCH 2 CH 2 PPH Isopentenyl pyrophosphate
20 Isopentenyl Pyrophosphate CH 3 H 2 C CCH 2 CH 2 PPH or PP Isopentenyl pyrophosphate
21 Isopentenyl and Dimethylallyl Pyrophosphate Isopentenyl pyrophosphate is interconvertible with 2-methylallyl pyrophosphate. PP Isopentenyl pyrophosphate PP Dimethylallyl pyrophosphate Dimethylallyl pyrophosphate has a leaving group (pyrophosphate) at an allylic carbon; it is reactive toward nucleophilic substitution at this position.
22 26.9 Carbon-Carbon Bond Formation in Terpene Biosynthesis
23 Carbon-Carbon Bond Formation PP + PP The key process involves the double bond of isopentenyl pyrophosphate acting as a nucleophile toward the allylic carbon of dimethylallyl pyrophosphate.
24 Carbon-Carbon Bond Formation PP + PP PP + PP
25 After C C C C Bond Formation... The carbocation can lose a proton to give a double bond. + PP
26 After C C C C Bond Formation... PP The carbocation can lose a proton to give a double bond. H + + PP
27 After C C C C Bond Formation... PP This compound is called geranyl pyrophosphate. It can undergo hydrolysis of its pyrophosphate to give geraniol (rose oil).
28 After C C C C Bond Formation... PP H 2 Geraniol H
29 From 10 Carbons to 15 PP + PP Geranyl pyrophosphate + PP
30 From 10 Carbons to 15 PP H + + PP
31 From 10 Carbons to 15 This compound is called farnesyl pyrophosphate. PP Hydrolysis of the pyrophosphate ester gives the alcohol farnesol (Figure 26.6).
32 From 15 Carbons to 20 PP PP Farnesyl pyrophosphate is extended by another isoprene unit by reaction with isopentenyl pyrophosphate.
33 Cyclization Rings form by intramolecular carbon-carbon bond formation. + PP PP E double bond Z double bond
34 Limonene H + H + H 2 α-terpineol
35 Bicyclic Terpenes α-pinene β-pinene
36 26.10 The Pathway from Acetate to Isopentenyl Pyrophosphate
37 Recall CH 3 3CH 3 CH HCCH 2 CCH 2 CH 2 H H CH 3 Mevalonic acid H 2 C CCH 2 CH 2 PPH Isopentenyl pyrophosphate
38 Biosynthesis of Mevalonic Acid In a sequence analogous to the early steps of fatty acid biosynthesis, acetyl coenzyme A is converted to S-acetoacetyl coenzyme A. CH 3 CCH 2 CSCoA S-Acetoacetyl coenzyme A
39 Biosynthesis of Mevalonic Acid CH 3 CCH 2 CSCoA + CH 3 CSCoA In the next step, S-acetoacetyl S coenzyme A reacts with acetyl coenzyme A. Nucleophilic addition of acetyl coenzyme A (probably via its enol) to the ketone carbonyl of S-acetoacetyl coenzyme A occurs.
40 Biosynthesis of Mevalonic Acid CH 3 CCH 2 CSCoA + CH 3 CSCoA H CH 3 CCHCH 2 CSCoA CH 2 CH
41 Biosynthesis of Mevalonic Acid Next, the acyl coenzyme A function is reduced. The product of this reduction is mevalonic acid. H CH 3 CCHCH 2 CSCoA CH 2 CH
42 H CH 3 CCHCH 2 CH 2 H CH 2 CH Mevalonic acid H CH 3 CCHCH 2 CSCoA CH 2 CH
43 Conversion of Mevalonic Acid to Isopentenyl Pyrophosphate H CH 3 CCH 2 CH 2 H CH 2 CH 2 P 3 CH 3 CCH 2 CH 2 PP CH 2 CH The two hydroxyl groups of mevalonic acid undergo phosphorylation.
44 Conversion of Mevalonic Acid to Isopentenyl Pyrophosphate 3 P 3 CH 3 CCH 2 CH 2 PP CH 2 C 2 P 3 CH 3 CCH 2 CH 2 PP CH 2 C Phosphorylation is followed by a novel elimination involving loss of C 2 and P 3 4.
45 Conversion of Mevalonic Acid to Isopentenyl Pyrophosphate CH 3 CCH 2 CH 2 PP CH 2 The product of this elimination is isopentenyl pyrophosphate.
46 Biosynthetic pathway is based on experiments with 14 C-labeled acetate CH 3 CH 3 CH HCCH 2 CCH 2 CH 2 H CH 3 H Mevalonic acid H 2 C CCH 2 CH 2 PPH Isopentenyl pyrophosphate
47 Biosynthetic pathway is based on experiments with 14 C-labeled acetate Citronellal biosynthesized using 14 C-labeled acetate as the carbon source had the labeled carbons in the positions indicated. CH 3 CH 3 CH H 2 C CCH 2 CH 2 PPH H
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