Janus Kinase Inhibitor Solid State Forms and Safe Synthesis

The patent replaces hazardous reagents (trimethylsilyldiazomethane, diazomethane) with safer alternatives (sodium bicarbonate, sodium carbonate, potassium carbonate, ammonium bicarbonate, ammonium carbonate, triethylamine, diisopropylethylamine) while maintaining the desired chemical transformation. This converts the harmful aspect of the original process into a beneficial safer process that achieves the same synthetic goal without the associated safety risks and environmental hazards.

The patent employs parameter changes by adjusting reaction conditions (pH, temperature, solvent composition) and purification parameters (crystallization conditions, drying parameters) to induce crystalline product formation. The use of specific bases and controlled reaction environments transforms the amorphous product of conventional methods into a crystalline form, improving manufacturability, stability, and characterization.

The patent utilizes phase transitions by developing different solid state forms (crystalline hydrates, anhydrous forms) of Compound 1 through controlled crystallization and solvation processes. These phase transitions result in distinct solid state structures with improved chemical and thermal stability, while the formulation complexity is managed through systematic development of these forms.

The patent employs an intermediary approach by using hydrophilic polymers and pH modifiers as mediating substances that control drug release. These intermediaries form gel layers that facilitate controlled release of Compound 1 regardless of pH, achieving sustained release profiles while managing formulation complexity through the use of well-characterized polymer systems.