Alternative solvent-free methodologies in the synthesis of pharmaceutical drugs.

Efforts made by chemists to develop more sustainable processes have resulted in a large increase in greener technologies. Because solvents comprise greater than 80% by mass of a pharmaceutical batch process, the incorporation of solvent-free reactions is expected to significantly reduce the quantity of hazardous waste that is generated during these processes. This review highlights a diverse set of solvent-free organic reactions that can be employed in the development of various pharmaceutical drugs.