AMORPHOUS FORM OF AFATINIB DIMALEATE
SUN PHARMACEUTICAL INDUSTRIES LIMITED
VERMA, Shyam Sunder; (IN).
SINGH, Shravan Kumar; (IN).
SINGH, Kaptan; (IN).
PRASAD, Mohan; (IN)
SINGH, Shravan Kumar; (IN).
SINGH, Kaptan; (IN).
PRASAD, Mohan; (IN)
Afatinib dimaleate is a tyrosine kinase inhibitor, chemically designated as 2-butenamide, N-[4-[(3-chloro-4-fluorophenyl)amino]-7-[[(35)-tetrahydro-3-furanyl]oxy]-6-quinazolinyl]-4-(dimethylamino)-,(2£)-, (2Z)-2-butenedioate (1:2) having the structure depicted by Formula I.
Formula I
U.S. Patent Nos. RE43,431 and 6,251,912 provide processes for the preparation of afatinib dimaleate.
U.S. Patent No. 8,426,586 and PCT Publication Nos. WO 2012/121764 and WO
2013/052157 provide processes for the preparation of crystalline forms of afatinib and their salts.
Example: Preparation of an amorphous form of afatinib dimaleate
In a round bottom flask, a mixture of afatinib (3 g) and ethyl acetate (30 mL) was heated to about 65°C to obtain a turbid solution. In another round bottom flask, a mixture of maleic acid (1.6 g) and ethyl acetate (30 mL) was heated to about 50°C to obtain a clear solution. The maleic acid solution was added to the afatinib solution, and then the reaction mixture was heated at about 75°C to about 80°C. The reaction mixture was stirred at about 75°C to about 80°C for about 1 hour. The reaction mixture was cooled to about
20°C to obtain a sticky material. The sticky material was scratched with a spatula, and then the reaction mixture was further stirred at about 20°C to about 25°C for about 1 hour. The material obtained was filtered, and then washed with ethyl acetate (20 mL). The solid obtained was dried under vacuum at about 45°C to about 50°C for about 15 hours to obtain the amorphous form of afatinib dimaleate.
Yield: 2.5 g (56%)
Sun Pharma chief Dilip Shanghvi
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