Eric G. Moschetta*, Benoit Cardinal-David*, Travis B. Dunn and Moiz Diwan,
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Scalable Protocol for Removing Triphenylphosphine Oxide from Reactions Using MgCl2 and Wet Milling
We report a scalable protocol for removing triphenylphosphine oxide (TPPO) from Mitsunobu coupling. In the protocol, solid MgCl2 reacts with TPPO in solution, forming an insoluble solid complex that is easily removed from the reaction mixture by simple filtration. Our development work revealed that regeneration of the surface of the particles through grinding was key to exposing more MgCl2, thereby increasing the rate of complexation of MgCl2 with TPPO. As a result, we implemented wet milling to provide the shear necessary to grind the particles and to provide a more robust strategy for scale-up of the protocol. Introducing wet milling and MgCl2 did not generate additional impurities in the studied reaction. Having established the protocol in development, we performed an appropriate scale-down reaction to determine the turnover number required to remove TPPO to a desired level at scale. Ultimately, we successfully demonstrated our wet milling protocol on a 14 kg scale of the Mitsunobu coupling, removing the TPPO in the crude mixture from 37.18 to 0.15 area % (HPLC) and to 0.6 wt % in the isolated product. Our protocol could be applied to other reactions in which TPPO is a byproduct, demonstrating its versatility and potentially expanding the scope of such reactions into later phases of pharmaceutical process development.
期刊介绍:
The journal Organic Process Research & Development serves as a communication tool between industrial chemists and chemists working in universities and research institutes. As such, it reports original work from the broad field of industrial process chemistry but also presents academic results that are relevant, or potentially relevant, to industrial applications. Process chemistry is the science that enables the safe, environmentally benign and ultimately economical manufacturing of organic compounds that are required in larger amounts to help address the needs of society. Consequently, the Journal encompasses every aspect of organic chemistry, including all aspects of catalysis, synthetic methodology development and synthetic strategy exploration, but also includes aspects from analytical and solid-state chemistry and chemical engineering, such as work-up tools,process safety, or flow-chemistry. The goal of development and optimization of chemical reactions and processes is their transfer to a larger scale; original work describing such studies and the actual implementation on scale is highly relevant to the journal. However, studies on new developments from either industry, research institutes or academia that have not yet been demonstrated on scale, but where an industrial utility can be expected and where the study has addressed important prerequisites for a scale-up and has given confidence into the reliability and practicality of the chemistry, also serve the mission of OPR&D as a communication tool between the different contributors to the field.