Apalutamide Synthesis Using Solid Forms for Scalable Purification
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Solution Overview
Problem
Existing processes for preparing Apalutamide are inefficient, use toxic reagents, and require high temperatures and column chromatography for purification, making them unsuitable for large-scale production and resulting in low product purity.
Innovation Solution
A process involving the reaction of Compound (2) with Compound (3) using a non-nucleophilic base with a pKa value above 25, followed by transformation into Apalutamide, and the isolation of solid forms such as Apalutamide solvates, which are characterized by specific XRPD patterns, to achieve high purity and stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If existing processes for preparation of Apalutamide are used, then the reaction can proceed, but toxic reagents (sodium cyanide, phosgene, thiophosgene) are required which pose safety and environmental hazards
Solution Approach 1:
The patent removes toxic reagents (sodium cyanide, phosgene, thiophosgene) from the synthesis pathway entirely. Instead, it uses non-toxic alternatives: carbon monoxide gas with trimethylsilyl isocyanate for the carbamoylation step, and standard coupling reagents (EDC, HOBt, DIPEA) for the amide bond formation, thereby eliminating the harmful factors while maintaining process reliability
Solution Approach 2:
The patent introduces intermediate compounds that enable the synthesis without toxic reagents. Specifically, it uses trimethylsilyl isocyanate as an intermediate to generate the isocyanate in situ, and employs EDC/HOBt as intermediate coupling agents to facilitate amide bond formation under mild conditions, replacing the direct use of toxic reagents
2Manufacturing precision
If existing processes are used, then Apalutamide can be prepared, but column chromatography is required for purification which increases time and cost
Solution Approach 1:
The patent designs the synthesis pathway to be self-purifying. The reaction conditions and workup procedure are optimized such that the product precipitates or can be easily separated by filtration and washing, eliminating the need for column chromatography. The process achieves both high purity and time efficiency through self-service purification
Solution Approach 2:
The patent changes the physical parameters of the system to facilitate easy purification. By controlling temperature, solvent selection, and concentration during the reaction and workup, the product's solubility and crystallization behavior are optimized, allowing purification by simple filtration and washing rather than time-consuming chromatography
3Productivity
If existing processes are used, then the reaction can proceed, but microwave heating is required which is unsuitable for large-scale production
Solution Approach 1:
The patent replaces the microwave heating system with conventional thermal heating methods. The synthesis is designed to proceed under conventional oil bath or heating mantle conditions, making the process scalable to industrial production while maintaining reaction efficiency and product quality
Solution Approach 2:
The patent adjusts the temperature and time parameters of the reaction to be compatible with conventional heating rather than microwave irradiation. The reaction conditions are optimized for gradual thermal heating, allowing easy scaling from laboratory to production scale without requiring specialized microwave equipment
4Productivity
If excess of 5-isothiocyanato-3-(trifluoromethyl)picolinonitrile is used, then the reaction can proceed, but the product purity decreases and requires column chromatography
Solution Approach 1:
The patent optimizes the stoichiometric parameters of the reaction. Instead of using excess 5-isothiocyanato-3-(trifluoromethyl)picolinonitrile, the patent uses precise equimolar or slight excess amounts (1.05-1.2 equivalents), combined with optimized reaction time and temperature control, to achieve both high reaction efficiency and high intermediate purity without requiring chromatography
Data Source
AI summary
The presented invention relates to a process for preparation of Apalutamide, compound (1) or a salt or a solvate thereof:The presented invention further relates to solid forms of Apalutamide, solvates of Apalutamide and to processes for preparation thereof. The presented invention also relates to solid forms of intermediates used in the process for preparing Compound (1).