Polymorphic forms of tadalafil

37 A process for preparing crystalline Form A of tadalafil (I), comprising crystallization from a solution of tadalafil in a solvent comprising a C-Cester, a ketone, dimethylformamide, dimethylsulfoxide, ethanol, acetonitrile, a chlorinated hydrocarbon, t-butanol, N,N-dimethylacetamide, dioxane, N-m...

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Main Authors Sajja, Eswaraiah, Vetukuri, Venkata Naga Kali Vara Prasada Raju, Ningam, Srinivas Reddy, Vedantham, Ravindra, Bodepudi, Rajyalakshmi
Format Patent
LanguageEnglish
Published 22.11.2011
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Summary:37 A process for preparing crystalline Form A of tadalafil (I), comprising crystallization from a solution of tadalafil in a solvent comprising a C-Cester, a ketone, dimethylformamide, dimethylsulfoxide, ethanol, acetonitrile, a chlorinated hydrocarbon, t-butanol, N,N-dimethylacetamide, dioxane, N-methyl pyrrolidone, or a mixture of any two or more thereof.