Flutamide

IUPAC nomenclature

2-Methyl-N-[4-nitro-3-(trifluoromethyl)phenyl]propanamide.

Classification

Flutamide is an antiandrogen. [1]

Physiochemical Properties

Mechanism of Action

Flutamide blocks the action of both endogenous and exogenous testosterone by binding to the androgen receptor.

Further , the drug is a potent inhibitor to testosterone-stimulated prostatic DNA synthesis.

It is also capable of inhibiting prostatic nuclear uptake of androgen. [2]

Structural Activity Relationship

• 2- hydroxyl derivative is an active metabolite.
• Electron-withdrawing substituents in the aromatic rings increases the activity.
• A branched alkyl chain alpha to the amide carbonyl have increased activity.
• Compounds with two electron-withdrawing substituents on the aromatic gave a better potency than the one substituent.
• When the CF3 group was introduced at the C2 position of anilide having only one electronwithdrawing substituent, antiandrogenic activity of compound increased by five-fold  [3]

Method of synthesis

2-(trifluoromethyl)-4-nitrobenzamine is reacted with 3-methylbutanoyl chloride to give flutamide.

Therapeutic Uses

The drug used for the treatment of:

• Advanced prostate cancer at stage D2, when there is evidence of metastases.

Side Effects

• Common side effects of flutamide include diarrhea, impotency, nipple discharge, decreased libido, swelling of the breast and hot flashes.
• Less common side effects are yellow-green discoloration of urine, increased blood tests measuring liver function, nausea and vomiting.

MCQs

Q.1 “2-Methyl-N-[4-nitro-3-(trifluoromethyl)phenyl]propanamide” is the IUPAC nomenclature of which drug?

a) Flutamide

b) Daunorubicin

c) Anastrozol

d) Thiotepa

Q.2 How many statements below are true with respect to the SAR of the drug?

• 2- hydroxyl derivative is an active metabolite.
• Electron-withdrawing substituents in the aromatic rings increases the activity.
• A branched alkyl chain alpha to the amide carbonyl have increased activity.
• Compounds with two electron-withdrawing substituents on the aromatic gave a better potency than the one substituent.

a) 1

b) 2

c) 3

d) 4

Q.3 The drug flutamide has how many chiral centers?

a) 0

b) 1

c) 2

d) 3

Q.4 The melting point of flutamide is?

a) 50 °C

b) 111 °C

c) 150 °C

d) 211 °C

Q.5 Flutamide is used as

a) An antimalarial drug

b) An anti-cancer drug

c) Sedative

d) None of the above

Q.6 The correct classification of the drug Flutamide can be?

a) Progestins

b) Aromatase inhibitors

c) Taxanes

d) Antiandrgens

Q.7 How many number of rings are found in the chemical structure of the drug Flutamide?

a) 1

b) 2

c) 3

d) 4

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ANSWERS

1-a

2-d

3-a

4-b

5-b

6-d

7-a

REFERENCES