A Robust, Streamlined Approach to Bosutinib Monohydrate

This article describes a systematic approach used to streamline the process for the isolation of bosutinib monohydrate, a promiscuous solvate former. A thorough understanding of the complex solid form landscape was garnered, and this knowledge was used to develop a process that routinely delivered the correct solid form and excellent purity at the end of the last bond-formation step, without the need for additional recrystallization and/or solid form conversion steps.