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© Ramaiah University of Applied Sciences
1
Faculty of Pharmacy
COX-1 AND COX-2 INHIBITORS
Presenting by,
Mr. Purushotham K N
Asst.professor
Dept. of Pharm. Chemistry
SACCP. ACU
2021-2022
© Ramaiah University of Applied Sciences
2
Cyclooxygenase (COX) is an enzyme that
forms prostaglandins, prostacyclins, and
thromboxanes—substances called prostanoids that
are responsible for the inflammatory response.
COX is known as a rate-limiting enzyme because it
serves as the major pathway or key for the formation
of these prostanoids.
© Ramaiah University of Applied Sciences
3
Faculty of Pharmacy
Cyclooxygenases (COX-1 and COX-2) are key enzymes in the
conversion of arachidonic acid to prostaglandins and other lipid
mediators. Because it can be induced by inflammatory stimuli, COX-
2 has been classically considered as the most appropriate target for
anti-inflammatory drugs. siologic functions
© Ramaiah University of Applied Sciences
4
Faculty of Pharmacy
• There are actually two forms of the cyclooxygenase enzyme: COX-1
and COX-2. Both are involved in inflammation, but only COX-1 has
a beneficial effect on the body as well.
• COX- 1 is known to be present in most of the tissues in your body. In
the gastrointestinal tract, COX-1 maintains the normal lining of the
stomach and intestines, protecting the stomach from the digestive
juices.The enzyme is also involved in kidney and platelet function.
• COX-2, on the other hand, is primarily found at sites of inflammation
© Ramaiah University of Applied Sciences
5
Faculty of Pharmacy
• COX 1 inhibitor is a non-steroidal anti-inflammatory drug that inhibits
cyclooxygenase-1 enzyme expressed constitutively in most tissues while COX
2 inhibitor is a non-steroidal anti-inflammatory drug that inhibits
cyclooxygenase-2 enzyme expressed in areas of inflammation.
• Non-steroidal anti-inflammatory drugs (NSAIDS) usually provide anti-
inflammatory, analgesic, and antipyretic effects. They are used in the
treatment of a variety of diseases. Non-steroidal anti-inflammatory drugs
inhibit a particular rate-limiting enzyme called cyclooxygenase (COX) involved
in the production of prostaglandins. Two isoforms of this enzyme have been
identified: COX 1 and COX 2.
• COX 1 inhibitor and COX 2 inhibitor are two non-steroidal anti-inflammatory
drugs involved in the inhibition of cyclooxygenase 1 (COX 1) and
cyclooxygenase 2 (COX 2), respectively.
© Ramaiah University of Applied Sciences
6
© Ramaiah University of Applied Sciences
7
Faculty of Pharmacy
Aryl and Heteroarylacetic Acids
Classification
• indene/indoles,
• pyrroles
• oxazoles
© Ramaiah University of Applied Sciences
8
Faculty of Pharmacy
Indene and Indole Acetic Acids
Indomethacin Structure
© Ramaiah University of Applied Sciences
9
Faculty of Pharmacy
Synthesis of Indomethacin
© Ramaiah University of Applied Sciences
10
Faculty of Pharmacy
Indene and Indole Acetic Acids
Sulindac Structure
© Ramaiah University of Applied Sciences
11
Faculty of Pharmacy
Ketolorac
© Ramaiah University of Applied Sciences
12
Anthtranilates (fenamates)
© Ramaiah University of Applied Sciences
13
Faculty of Pharmacy
Mefenamic Acid
© Ramaiah University of Applied Sciences
14
Faculty of Pharmacy
Meclofenamic Acid
© Ramaiah University of Applied Sciences
15
©M. S. Ramaiah University of Applied Sciences
15
© Ramaiah University of Applied Sciences
16
Faculty of Pharmacy
Oxicams (“Enol Acids”)
• Oxicams (Piroxicam and Meloxicam) are characterized by the 4-
hydroxybenzothiazine heterocycle.
• The acidity of the oxicams is attributed to the 4-OH with the
enolate anion being stabilized by intramolecular hydrogen-bonding
to the amide N-H group.
• These compounds are acidic (pKa = 6.3).
© Ramaiah University of Applied Sciences
17
Faculty of Pharmacy
Oxicams (“Enol Acids”)
• The oxicams are primarily ionized at physiologic pH and acidity is
required for COX inhibitory activity.
• Examples include Piroxicam and Meloxicam
© Ramaiah University of Applied Sciences
18
Faculty of Pharmacy
Piroxicam
© Ramaiah University of Applied Sciences
19
Faculty of Pharmacy
Meloxicam
© Ramaiah University of Applied Sciences
20
Faculty of Pharmacy
Phenylpyrazolones
Pyrazole
• Simply double unsaturated compound containing 2 N’s
and 3 C’s in the ring with the nitrogen atoms
neighbouring
© Ramaiah University of Applied Sciences
21
Phenylpyrazolones
Pyrazole – Reduction products
Pyrazoline Pyrazolidine
© Ramaiah University of Applied Sciences
22
Pyrazoline Substitution Products
5 – Pyrazolone 3,5-pyrazolidinedione
© Ramaiah University of Applied Sciences
23
Faculty of Pharmacy
Phenylpyrazolones
Phenylbutazone
© Ramaiah University of Applied Sciences
24
Faculty of Pharmacy
Oxyphenbutazone
© Ramaiah University of Applied Sciences
25
Faculty of Pharmacy
Silphinpyrazone
© Ramaiah University of Applied Sciences
26
Faculty of Pharmacy
SAR’s
• Pharmacologic activity of the 3,5-pyrazolidinedione derivatives are
closely related to their Acidity (the Acidic H at 4-position). The
dicarbonyl functions at 3- and 5- positions enhance the acidity of
the Hydrogen at the 4-position.
• Eliminating the acidic proton at the 4-position abolishes anti-
inflammatory activity.
• Enhancing the acidity too much leads to a decrease in anti-
inflammatory activity while other effects like uricosuric effects and
sodium retention
© Ramaiah University of Applied Sciences
27
Faculty of Pharmacy
SAR’s
• A single alkyl group at the 4-position enhances anti-inflammatory
with the most activity being given by the n-butyl substituent.
• Substitution of the 2- phenylthioethyl group at the four position
produces anti-gout drug sulphinpyrazone
© Ramaiah University of Applied Sciences
28
Faculty of Pharmacy
Anilides [p-aminophenol Derivatives]
• Introduced as analgesics after the discovery of the powerful
antipyretic activities of aniline
• The anilides are simple acetamides of aniline (Aminobenzene),
which may or may not contain a 4-hydroxy or 4-alkoxy group.
• Anilides do not possess the carboxylic acid functionality and
therefore they are classified as neutral drugs and possess little
inhibitory activity against cyclooxygenase.
© Ramaiah University of Applied Sciences
29
Faculty of Pharmacy
Anilides [p-aminophenol Derivatives]
• They are believed to act as scavengers of hydroperoxide
radicals.
• Acetanilide was first introduced and was found to be too toxic
causing jaundice.
• Phenacetin was withdrawn recently due to Nephrotoxicity.
• Paracetamol remains the only useful member of this group
(introduced in1891)
© Ramaiah University of Applied Sciences
30
Faculty of Pharmacy
© Ramaiah University of Applied Sciences
31
Faculty of Pharmacy
SAR’s
• Esterification of the phenolic functional groups with
methyl or propyl groups produce derivatives with greater
side effects than the ethyl derivative.
• Substituents on the Nitrogen atom, which reduce the
basicity, also reduce activity unless the substituent is
metabolically labile e.g., acetyl.
• Amides derived from aromatic acid e.g. N-Phenyl
benzamide's (Benzanilide) are less active or even inactive
© Ramaiah University of Applied Sciences
32
Faculty of Pharmacy
Synthesis of Paracetamol
• Preparation of paracetamol involves treating an amine (p-
aminophenol) with an acid anhydride (acetic anhydride) to form an
amide (p-acetamidophenol).
© Ramaiah University of Applied Sciences
33
Faculty of Pharmacy
Selective COX-2 Inhibitors
• Prostaglandins that mediate inflammation, fever and pain are
produced solely COX-2 (Highly inducible by inflammation)
• Selective Cox – 2 inhibitors are devoid of side effects such as gastric
ulcer and it does not affect the normal functioning of the platelet,
uterus and renal system.
© Ramaiah University of Applied Sciences
34
Faculty of Pharmacy
Celecoxib
© Ramaiah University of Applied Sciences
35
Faculty of Pharmacy
Rofecoxib
© Ramaiah University of Applied Sciences
36
Faculty of Pharmacy
Valdecoxib
© Ramaiah University of Applied Sciences
37
Faculty of Pharmacy
Summary
• The non-steroidal anti-inflammatory drugs (NSAIDs) are widely
used for the treatment of minor pain and for the management of
edema and tissue damage resulting from inflammatory joint
disease (arthritis).
• The major mechanism by which the NSAIDs elicit their therapeutic
effects (antipyretic, analgesic, and antiinflammatory activities) is
inhibition of prostaglandin (PG) synthesis.
• Most NSAIDs are mainly COX-1 selective (e.g., aspirin, ketoprofen,
indomethacin, piroxicam, sulindac).
© Ramaiah University of Applied Sciences
38
Faculty of Pharmacy
THANK YOU

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COX.pptx

  • 1. © Ramaiah University of Applied Sciences 1 Faculty of Pharmacy COX-1 AND COX-2 INHIBITORS Presenting by, Mr. Purushotham K N Asst.professor Dept. of Pharm. Chemistry SACCP. ACU 2021-2022
  • 2. © Ramaiah University of Applied Sciences 2 Cyclooxygenase (COX) is an enzyme that forms prostaglandins, prostacyclins, and thromboxanes—substances called prostanoids that are responsible for the inflammatory response. COX is known as a rate-limiting enzyme because it serves as the major pathway or key for the formation of these prostanoids.
  • 3. © Ramaiah University of Applied Sciences 3 Faculty of Pharmacy Cyclooxygenases (COX-1 and COX-2) are key enzymes in the conversion of arachidonic acid to prostaglandins and other lipid mediators. Because it can be induced by inflammatory stimuli, COX- 2 has been classically considered as the most appropriate target for anti-inflammatory drugs. siologic functions
  • 4. © Ramaiah University of Applied Sciences 4 Faculty of Pharmacy • There are actually two forms of the cyclooxygenase enzyme: COX-1 and COX-2. Both are involved in inflammation, but only COX-1 has a beneficial effect on the body as well. • COX- 1 is known to be present in most of the tissues in your body. In the gastrointestinal tract, COX-1 maintains the normal lining of the stomach and intestines, protecting the stomach from the digestive juices.The enzyme is also involved in kidney and platelet function. • COX-2, on the other hand, is primarily found at sites of inflammation
  • 5. © Ramaiah University of Applied Sciences 5 Faculty of Pharmacy • COX 1 inhibitor is a non-steroidal anti-inflammatory drug that inhibits cyclooxygenase-1 enzyme expressed constitutively in most tissues while COX 2 inhibitor is a non-steroidal anti-inflammatory drug that inhibits cyclooxygenase-2 enzyme expressed in areas of inflammation. • Non-steroidal anti-inflammatory drugs (NSAIDS) usually provide anti- inflammatory, analgesic, and antipyretic effects. They are used in the treatment of a variety of diseases. Non-steroidal anti-inflammatory drugs inhibit a particular rate-limiting enzyme called cyclooxygenase (COX) involved in the production of prostaglandins. Two isoforms of this enzyme have been identified: COX 1 and COX 2. • COX 1 inhibitor and COX 2 inhibitor are two non-steroidal anti-inflammatory drugs involved in the inhibition of cyclooxygenase 1 (COX 1) and cyclooxygenase 2 (COX 2), respectively.
  • 6. © Ramaiah University of Applied Sciences 6
  • 7. © Ramaiah University of Applied Sciences 7 Faculty of Pharmacy Aryl and Heteroarylacetic Acids Classification • indene/indoles, • pyrroles • oxazoles
  • 8. © Ramaiah University of Applied Sciences 8 Faculty of Pharmacy Indene and Indole Acetic Acids Indomethacin Structure
  • 9. © Ramaiah University of Applied Sciences 9 Faculty of Pharmacy Synthesis of Indomethacin
  • 10. © Ramaiah University of Applied Sciences 10 Faculty of Pharmacy Indene and Indole Acetic Acids Sulindac Structure
  • 11. © Ramaiah University of Applied Sciences 11 Faculty of Pharmacy Ketolorac
  • 12. © Ramaiah University of Applied Sciences 12 Anthtranilates (fenamates)
  • 13. © Ramaiah University of Applied Sciences 13 Faculty of Pharmacy Mefenamic Acid
  • 14. © Ramaiah University of Applied Sciences 14 Faculty of Pharmacy Meclofenamic Acid
  • 15. © Ramaiah University of Applied Sciences 15 ©M. S. Ramaiah University of Applied Sciences 15
  • 16. © Ramaiah University of Applied Sciences 16 Faculty of Pharmacy Oxicams (“Enol Acids”) • Oxicams (Piroxicam and Meloxicam) are characterized by the 4- hydroxybenzothiazine heterocycle. • The acidity of the oxicams is attributed to the 4-OH with the enolate anion being stabilized by intramolecular hydrogen-bonding to the amide N-H group. • These compounds are acidic (pKa = 6.3).
  • 17. © Ramaiah University of Applied Sciences 17 Faculty of Pharmacy Oxicams (“Enol Acids”) • The oxicams are primarily ionized at physiologic pH and acidity is required for COX inhibitory activity. • Examples include Piroxicam and Meloxicam
  • 18. © Ramaiah University of Applied Sciences 18 Faculty of Pharmacy Piroxicam
  • 19. © Ramaiah University of Applied Sciences 19 Faculty of Pharmacy Meloxicam
  • 20. © Ramaiah University of Applied Sciences 20 Faculty of Pharmacy Phenylpyrazolones Pyrazole • Simply double unsaturated compound containing 2 N’s and 3 C’s in the ring with the nitrogen atoms neighbouring
  • 21. © Ramaiah University of Applied Sciences 21 Phenylpyrazolones Pyrazole – Reduction products Pyrazoline Pyrazolidine
  • 22. © Ramaiah University of Applied Sciences 22 Pyrazoline Substitution Products 5 – Pyrazolone 3,5-pyrazolidinedione
  • 23. © Ramaiah University of Applied Sciences 23 Faculty of Pharmacy Phenylpyrazolones Phenylbutazone
  • 24. © Ramaiah University of Applied Sciences 24 Faculty of Pharmacy Oxyphenbutazone
  • 25. © Ramaiah University of Applied Sciences 25 Faculty of Pharmacy Silphinpyrazone
  • 26. © Ramaiah University of Applied Sciences 26 Faculty of Pharmacy SAR’s • Pharmacologic activity of the 3,5-pyrazolidinedione derivatives are closely related to their Acidity (the Acidic H at 4-position). The dicarbonyl functions at 3- and 5- positions enhance the acidity of the Hydrogen at the 4-position. • Eliminating the acidic proton at the 4-position abolishes anti- inflammatory activity. • Enhancing the acidity too much leads to a decrease in anti- inflammatory activity while other effects like uricosuric effects and sodium retention
  • 27. © Ramaiah University of Applied Sciences 27 Faculty of Pharmacy SAR’s • A single alkyl group at the 4-position enhances anti-inflammatory with the most activity being given by the n-butyl substituent. • Substitution of the 2- phenylthioethyl group at the four position produces anti-gout drug sulphinpyrazone
  • 28. © Ramaiah University of Applied Sciences 28 Faculty of Pharmacy Anilides [p-aminophenol Derivatives] • Introduced as analgesics after the discovery of the powerful antipyretic activities of aniline • The anilides are simple acetamides of aniline (Aminobenzene), which may or may not contain a 4-hydroxy or 4-alkoxy group. • Anilides do not possess the carboxylic acid functionality and therefore they are classified as neutral drugs and possess little inhibitory activity against cyclooxygenase.
  • 29. © Ramaiah University of Applied Sciences 29 Faculty of Pharmacy Anilides [p-aminophenol Derivatives] • They are believed to act as scavengers of hydroperoxide radicals. • Acetanilide was first introduced and was found to be too toxic causing jaundice. • Phenacetin was withdrawn recently due to Nephrotoxicity. • Paracetamol remains the only useful member of this group (introduced in1891)
  • 30. © Ramaiah University of Applied Sciences 30 Faculty of Pharmacy
  • 31. © Ramaiah University of Applied Sciences 31 Faculty of Pharmacy SAR’s • Esterification of the phenolic functional groups with methyl or propyl groups produce derivatives with greater side effects than the ethyl derivative. • Substituents on the Nitrogen atom, which reduce the basicity, also reduce activity unless the substituent is metabolically labile e.g., acetyl. • Amides derived from aromatic acid e.g. N-Phenyl benzamide's (Benzanilide) are less active or even inactive
  • 32. © Ramaiah University of Applied Sciences 32 Faculty of Pharmacy Synthesis of Paracetamol • Preparation of paracetamol involves treating an amine (p- aminophenol) with an acid anhydride (acetic anhydride) to form an amide (p-acetamidophenol).
  • 33. © Ramaiah University of Applied Sciences 33 Faculty of Pharmacy Selective COX-2 Inhibitors • Prostaglandins that mediate inflammation, fever and pain are produced solely COX-2 (Highly inducible by inflammation) • Selective Cox – 2 inhibitors are devoid of side effects such as gastric ulcer and it does not affect the normal functioning of the platelet, uterus and renal system.
  • 34. © Ramaiah University of Applied Sciences 34 Faculty of Pharmacy Celecoxib
  • 35. © Ramaiah University of Applied Sciences 35 Faculty of Pharmacy Rofecoxib
  • 36. © Ramaiah University of Applied Sciences 36 Faculty of Pharmacy Valdecoxib
  • 37. © Ramaiah University of Applied Sciences 37 Faculty of Pharmacy Summary • The non-steroidal anti-inflammatory drugs (NSAIDs) are widely used for the treatment of minor pain and for the management of edema and tissue damage resulting from inflammatory joint disease (arthritis). • The major mechanism by which the NSAIDs elicit their therapeutic effects (antipyretic, analgesic, and antiinflammatory activities) is inhibition of prostaglandin (PG) synthesis. • Most NSAIDs are mainly COX-1 selective (e.g., aspirin, ketoprofen, indomethacin, piroxicam, sulindac).
  • 38. © Ramaiah University of Applied Sciences 38 Faculty of Pharmacy THANK YOU