Oxatomide

IUPAC nomenclature

1-{3-[4-(diphenylmethyl)piperazin-1-yl]propyl}-1,3-dihydro-2H-benzimidazol-2-one

Classification

• H1-receptor antihistamine
• Piperazine antihistamine

Physiochemical Properties

Mechanism of Action

• Oxatomide produces antagonistic effects at H1 receptors.
• It also has antiserotonergic activity.

Structure Activity Relationship

Structure activity of piperizine antihistamines can be summarized as:

• These are the derivatives of ethylene diamines.
• The connecting moiety is CHN group
• Primary structural difference is nature of para aromatic ring substituent
• These are moderately potent.
• Slow onset of action
• Low incidence of drowsiness
• They also exhibit peripheral and central antimuscarinic activity.

Method of synthesis

i. 2-benzimidazolone is reacted with 1-bromo-3-chloropropane to give 1-(3-chloropropyl)-2-benzimidazolone.

ii. The last is reacted with 1-benzhydrylpiperazine in presence of sodium carbonate to give oxatomide. [1]

Medicinal Uses

Oxatomide is used for treatment of:

• Allergic rhinitis
• Chronic urticaria

Side Effects

Side effects of Oxatomide are:

• Drowsiness
• Vomiting
• Dry mouth
• Fatigue
• Headache
• Difficulty in breathing
• Swelling of face

MCQs

Q.1 Match the following with correct SAR of the piperizine antihistamine drugs:

 a) i-A, ii-C

b) i-A, ii-D

c) i-B, ii-C

d) i-B, ii-D

Q.2 Correct sequence for the True/False for correct IUPAC names of the drug can be?

• Oxatomide: 1-{3-[4-(diphenylmethyl)piperazin-1-yl]propyl}-1,3-dihydro-2H-benzimidazol-2-one
• Tetracaine: 2-(diphenylmethoxy)-N,N-dimethylethanamine
• Clemastine: (2R)-2-{2-[(1R)-1-(4-chlorophenyl)-1-phenylethoxy]ethyl}-1-methylpyrrolidine
• Methimazole: 4-hydroxy-2-methyl-N-(5-methyl-1,3-thiazol-2-yl)-1,1-dioxo-1λ6,2-benzothiazine-3-carboxamide

a) TFFT

b)TFTF

c) TTTT

d) FFFT

Q.3 Molecular weight of Oxatomide is?

a) 426.6 gm/mol

b) 140.6 gm/mol

c) 361.4 gm/mol

d) 134.2 gm/mol

Q.4 Along with antihistaminic property, oxatomide also has?

a) Anti-diabetic activity

b) Anti-neoplastic actvity

c) Anti-serotonergic activity

d) Anti-hyperlipidemic activity

Q.5 Which amongst the following is not a therapeutic use of drug oxatomide?

a) Chronic urticaria

b) Allergic rhinitis

c) Hay fever

d) Anticoagulant

Q.6 Which of the following drug and their classification are correct?

I. Oxatomide: H1 receptor antihistamine drug

II. Famotdine: H2 receptor antihistamine drug

III. Pantoprazole: Proton pump inhibitor

IV. Tolbutamide: Antineoplastic drug

a) I, III

b) I, II, III, IV

c) III, IV

d) I, II, III

Q.7 1-(3-chloropropyl)-2-benzimidazolone reacts with benzhydrylpiperizine in presence of sodium carbonate to give which drug?

a) Oxatomide

b) Lasoprazole

c) Amphetamine

d) Busulfan

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ANSWERS

1-b                                                  

2-b

3-a

4-c

5-d

6-d

7-a

REFERENCES