Module 1.4: Medicinal Chemistry Flashcards
Oraganic Medicinal Chemistry
SAR adrenergic Agonist: Substitution at R2
Increase in alpha 2 activity
SAR adrenergic Agonist: Substitution at R2
Increases B-activity
Increase CNS & Oral activity
Decrease degradation by MAO
SAR adrenergic Agonist: Aromatic Substitution
3-OH is for Alpha activity
* 4-OH is for Beta activity
* 3&4-OH – both
SAR adrenergic Agonist: Aromatic Substitution
3-OH is for
* 4-OH is for
* 3&4-OH – both
3-OH is for Alpha activity
* 4-OH is for Beta activity
* 3&4-OH – both
SAR adrenergic Agonist: aromatic substitution at3 and 4
___, ____ oral activity
Polar, decreases oral activity
SAR adrenergic Agonist: aromatic sustitution: Metabolized by ___ leading to Shorter DOA
COMT
SAR adrenergic Agonist: aromatic sustitution: Metabolized by COMT leading to _____
Shorter DOA
Adrenergic agonist means
Sympathomimetic activity
SAR of Adrenergoc Agonist:
Lack of 1 OH –__
▪ Absence of both OH – __
resistance to COMT
indirect activity
Adrenergic agonist means
Fight or flight response: Sympathomimetic
SAR adrenergic Agonist: Aromatic Substitution
3-OH replacement by ___ 3-OH replacement by _________ will
→increase Beta activity
→ decrease degradation by COMT
Methanol
SAR adrenergic Agonist: Aromatic Substitution Moving 4-OH to 5-OH will
___
____
→increase B2 activity
→ decrease degradation by COMT
SAR adrenergic Agonist: Aromatic Substitution
Moving____ will
→increase B2 activity
→ decrease degradation by COMT
4-OH to 5-OH
SAR of Adrenergoc Agonist:
____ – resistance to COMT
_____- indirect activity
Lack of 1 OH
Absence of both OH –
SAR of Adrenergoc ANTAGONIST: Alpha blocker
pharmacopore
Quinazoline
SAR of Adrenergoc ANTAGONIST: ____
Sympatholitic
SAR of Adrenergoc ANTAGONIST: Alpha blocker
Prototype
Prazosin
SAvR of Adrenergoc ANTAGONIST: Alpha blocker
____ is essential for the activity
4-amino group
SAR of Adrenergoc ANTAGONIST: Alpha blocker
__ 2nd position of quinazoline
Piperazine
SAR of Adrenergoc ANTAGONIST: Alpha blocker
Positions __, __, __, __ can be varied
5,6,7,8
SAR of Adrenergoc ANTAGONIST: Alpha blocker
Can be any heterocyclic ring
Piperazine
SAR of Adrenergoc ANTAGONIST: Alpha blocker
examples
Piperazine and piperadine
SAR of Adrenergoc ANTAGONIST: BETA blocker
Pharmacopore
Aryloxopropanol
SAR of Adrenergoc ANTAGONIST: BETA blocker
Prototype
Propranolol
SAR of Adrenergoc ANTAGONIST: BETA blocker
____ can be varied with other heteroaromatic ring
Aryl ring
SAR of Adrenergoc ANTAGONIST: BETA blocker
__, and __ both beneficial to activity
Branching & extension
SAR of Cholinergic agonists: ___
parasympathomimetic
SAR of Cholinergic agonists: Direct Acting
Pharmacopore
Acetylcholine
SAR of Cholinergic agonists: Direct Acting
Prototype
Acetylcholine
SAR of Cholinergic agonists: Direct Acting
Acetylcholine components Functional group
- Acetoxy/Ester Portion
- Ethylene Bridge
- Quaternary Nitrogen
All are essential for the activity – overall size of the molecule should not be altered
SAR of Cholinergic agonists: Direct Acting
Acetylcholine components Functional group
All are essential for the activity – overall size of the molecule ___ be altered
should not
SAR of Cholinergic agonists: Direct Acting
_____
* The methyl group cannot be extended
but may be replaced with NH2 (Carbamate)
* Not easily hydrolyzed
* Longer DOA
Acetoxy/Ester Portion
SAR of Cholinergic agonists: Direct Acting
Acetoxy/Ester Portion
* ____ cannot be extended
but may be replaced with NH2
The methyl group
SAR of Cholinergic agonists: Direct Acting
_____ cannot be altered
Ammonium group
SAR of Cholinergic agonists: Direct Acting
Acetoxy/Ester Portion
Not easily ____
Longer ___
hydrolyzed
DOA
SAR of Cholinergic agonists: Direct Acting
___: Addition of methyl increase muscarinic selectivity; longer duration of action
choline/ ethylene bridge
SAR of Cholinergic agonists: INDIRECT Acting
- Prototype: Physostigmine
* Equivalent to the ester of acetylcholine (recognize by AChE but not easily hydrolyzed by the enzyme
Carbamate
SAR of Cholinergic agonists: Direct Acting
choline/ ethylene bridge : Addition of ___ increase muscarinic selectivity; longer duration of action
methyl
SAR of Cholinergic agonists: INDIRECT Acting
Prototype of Carbamate
Physostigmine
SAR of Cholinergic agonists: INDIRECT Acting
Carbamate:
Equivalent to the ____ (recognize by AChE but not easily hydrolyzed by the enzyme)
ester of acetylcholine
SAR of Cholinergic agonists: INDIRECT Acting
Carbamate: has a ___ group
amino group
SAR of Cholinergic agonists: INDIRECT Acting
Carbamate: has an amine group to prevent ____
hydrolysis
SAR of Cholinergic ANTAGONIST:
_____
Prototype drug: Atropine
Contains Tropane ring system
Amino Alcohols Esters SAR
SAR of Cholinergic ANTAGONIST:
Amino Alcohols Esters SAR
Prototype drug: ___
Contains Tropane ring system
Atropine
SAR of Cholinergic ANTAGONIST:
Amino Alcohols Esters SAR
Prototype drug: Atropine
Contains _____system
Tropane ring
SAR of Anxiolytics, Sedative, and Hypnotic agents
Benzodiazepine
MOA: Increase ______________ of opening of GABA-gated Chloride Channel
SAR of Anxiolytics, Sedative, and Hypnotic agents
__
C=O – is essential for the activity
* Fused triazole or Imidazole ring at positions 1 and 2 – increases activity
* Fused ring – Imidazole = Midazolam
Benzodiazepine
SAR of Anxiolytics, Sedative, and Hypnotic agents
____
MOA: Increase frequency of opening of GABA-gated Chloride Channel
Benzodiazepine
SAR of Anxiolytics, Sedative, and Hypnotic agents
Benzodiazepine
MOA: Increase frequency of opening of ____
GABA-gated Chloride Channel
SAR of Anxiolytics, Sedative, and Hypnotic agents
Benzodiazepine
MOA: Increase ______________ of opening of GABA-gated Chloride Channel
Frequency
SAR of Anxiolytics, Sedative, and Hypnotic agents
Benzodiazepine
___ – is essential for the activity
* Fused triazole or Imidazole ring at positions 1 and 2 – increases activity
* Fused ring – Imidazole = Midazolam
C=O Carboxyl
SAR of Anxiolytics, Sedative, and Hypnotic agents
Benzodiazepine
C=O – is essential for the activity
_____ or Imidazole ring at positions 1 and 2 – increases activity
* Fused ring – Imidazole = Midazolam
- Fused triazole
SAR of Anxiolytics, Sedative, and Hypnotic agents
Benzodiazepine
C=O – is essential for the activity
* Fused triazole or ____ at positions 1 and 2 – increases activity
* Fused ring – Imidazole = Midazolam
Imidazole ring
SAR of Anxiolytics, Sedative, and Hypnotic agents
Benzodiazepine
C=O – is essential for the activity
* Fused triazole or Imidazole ring at positions ____ – increases activity
* Fused ring – Imidazole = Midazolam
1 and 2
SAR of Anxiolytics, Sedative, and Hypnotic agents
Benzodiazepine
C=O – is essential for the activity
* Fused triazole or Imidazole ring at positions 1 and 2– _____
* Fused ring – Imidazole = Midazolam
increases activity
SAR of Anxiolytics, Sedative, and Hypnotic agents
Benzodiazepine
C=O – is essential for the activity
* Fused triazole or Imidazole ring at positions 1 and 2– increases activity
*______ – Imidazole = Midazolam
Fused ring
SAR of Anxiolytics, Sedative, and Hypnotic agents
Benzodiazepine
SAR of Anxiolytics, Sedative, and Hypnotic agents
Benzodiazepine
______ substitution with EWG increases the
activity= increases CNS Activity
X - Carbon7
SAR of Anxiolytics, Sedative, and Hypnotic agents
Benzodiazepine
X: substitution with EWG increases the
activity= _______
increases CNS Activity
SAR of Anxiolytics, Sedative, and Hypnotic agents
Benzodiazepine= _____ group – increases the activity
* Prime numbering in the aromatic ring
indicates the possible attachment of
substituents
* 2’ or 2’ and 6’ – substitution with EWG will
increase the drug activity
* 4’ substitution – will decrease the activity
5-phenyl
SAR of Anxiolytics, Sedative, and Hypnotic agents
Benzodiazepine= 5-phenyl group – ___
* Prime numbering in the aromatic ring
indicates the possible attachment of
substituents
* 2’ or 2’ and 6’ – substitution with EWG will
increase the drug activity
* 4’ substitution – will decrease the activity
increases the activity
SAR of Anxiolytics, Sedative, and Hypnotic agents
Benzodiazepine= 5-phenyl group – increases the activity
* ______ numbering in the aromatic ring
indicates the possible attachment of
substituents
* 2’ or 2’ and 6’ – substitution with EWG will
increase the drug activity
* 4’ substitution – will decrease the activity
Prime
SAR of Anxiolytics, Sedative, and Hypnotic agents
Benzodiazepine= 5-phenyl group – increases the activity
* Prime numbering in the aromatic ring indicates the possible attachment of substituents
*______ – substitution with EWG will
increase the drug activity
* 4’ substitution – will decrease the activity
2’ or 2’ and 6’
SAR of Anxiolytics, Sedative, and Hypnotic agents
BenSAR of Anxiolytics, Sedative, and Hypnotic agents
Benzodiazepine= 5-phenyl group – increases the activity
* Prime numbering in the aromatic ring
indicates the possible attachment of
substituents
* 2’ or 2’ and 6’ – substitution with EWG will
increase the drug activity
*______ – will decrease the activityzodiazepine= 5-phenyl group – increases the activity
4’ substitution
SAR of Anxiolytics, Sedative, and Hypnotic agents
Benzodiazepine= 5-phenyl group – increases the activity
* Prime numbering in the aromatic ring
indicates the possible attachment of
substituents
* 2’ or 2’ and 6’ – substitution with EWG will
increase the drug activity
* 4’ substitution – will ____ the activity
decrease
SAR of Anxiolytics, Sedative, and Hypnotic agents
Barbiturates MOA: Increase duration of
____
opening of GABA-gated Chloride Channel
SAR of Anxiolytics, Sedative, and Hypnotic agents
Barbiturates MOA: Increase _____________ of
opening of GABA-gated Chloride Channel
duration
SAR of Anxiolytics, Sedative, and Hypnotic agents
Barbiturates
_______
* Increase lipophilicity
* Quick Onset and Short DOA
R1 Alkyl substitution
SAR of Anxiolytics, Sedative, and Hypnotic agents
Barbiturates
R1 Alkyl substitution
*___
* Quick Onset and Short DOA
Increase lipophilicity
SAR of Anxiolytics, Sedative, and Hypnotic agents
Barbiturates
R1 Alkyl substitution
* Increase lipophilicity
* Quick Onset and ___
Short DOA
SAR of Anxiolytics, Sedative, and Hypnotic agents
Barbiturates
______
* Increase lipophilicity
* Ultra-short acting effect
Replacing oxygen w/ sulfur
SAR of Anxiolytics, Sedative, and Hypnotic agents
Barbiturates
R5 Alkyl or Aryl (Aromatic ring)
substitution
* Increase ____
lipophilicity
SAR of antipsychotic and antidepressant drug
Antipsychotic :
_______
* Increases the potency
R2 EWG substitution
SAR of antipsychotic and antidepressant drug
Antipsychotic :
R2 EWG substitution
* _____
Increases the potency
SAR of antipsychotic and antidepressant drug
Antipsychotic :
3 degree Amine
* ____ must have a
N-containing side chain on the ring N and must be separated by at least 3C!
* Essential for the activity
R-group
SAR of antipsychotic and antidepressant drug
Antipsychotic :
3 degree Amine
* R-group must have a
___ side chain on the ring N and must be separated by at least 3C!
* Essential for the activity
N-containing