4-[(2,4-Dichloro-5-methoxyphenyl)amino]-6-methoxy-7-[3-(4-methyl-1-piperazinyl)propoxy]-3-quinolinecarbonitrile → Bosutinib monohydrate

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4-[(2,4-Dichloro-5-methoxyphenyl)amino]-6-methoxy-7-[3-(4-methyl-1-piperazinyl)propoxy]-3-quinolinecarbonitrile, Form III (2.0 g) was stirred for 24 hours with 40 ml of water at 95° C. The mixture was cooled to room temperature and filtered. The cake was washed with 10 ml of water and vacuum dried at 45° C. to give 1.83 g of 4-[(2,4-dichloro-5-methoxyphenyl)amino]-6-methoxy-7-[3-(4-methyl-1-piperazinyl)propoxy]-3-quinolinecarbonitrile monohydrate, Form I by XRD scans.

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