Compound A Synthesis via Isocyanate Route for High-Purity Scale-Up
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
There is a need for an efficient, scalable, and cost-effective process for preparing Compound A, a synthetic intermediate in the synthesis of the KRAS G12C inhibitor AMG 510, which is crucial for treating KRAS-mutated cancers, as existing methods are cumbersome, yield low purity, and have a high environmental impact.
Innovation Solution
A process involving the formation of 3-isocyanato-2-isopropyl-4-methylpyridine (Compound C) without an acyl-isocyanate intermediate, using milder bases like tetramethylguanidine and 1,8-diazabicyclo[5.4.0]undec-7-ene, and conducting reactions in a single reaction vessel, allowing direct crystallization and filtration of Compound A, reducing unwanted by-products and environmental footprint.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If existing methods are used to prepare Compound A, then the compound can be obtained, but the yield is low and purity is insufficient
Solution Approach 1:
The synthesis is divided into distinct stages: formation of isocyanate compound C, coupling with nicotinamide D to form intermediate E, and cyclization to Compound A. Each stage is optimized independently, with intermediate E isolated and purified before the final cyclization step, ensuring high overall purity and yield
Solution Approach 2:
The patent introduces a stable intermediate compound E (2,6-dichloro-5-fluoro-N-((2-isopropyl-4-methylpyridin-3-yl)carbamoyl)nicotinamide) that can be isolated, purified, and stored. This intermediary step allows for quality control and prevents carryover of impurities to the final product, resolving the contradiction between yield and purity
2Productivity
If existing synthesis methods are used, then Compound A can be produced, but the process is cumbersome and time-consuming
Solution Approach 1:
Multiple reaction steps are combined in a telescoped sequence where the crude intermediate E from the coupling reaction is directly used in the cyclization reaction without extensive purification. The solvent from the first step is retained and used in the second step, reducing processing time and complexity while maintaining product quality
Solution Approach 2:
The isocyanate compound C is prepared in advance and characterized before use in the coupling reaction. This preliminary preparation ensures that the correct intermediate is formed, preventing downstream issues and reducing overall process time by avoiding rework
3Object-affected harmful factors
If conventional methods are used, then Compound A can be synthesized, but solvent usage is high and environmental impact is significant
Solution Approach 1:
The patent implements solvent recovery and reuse protocols where solvents from the coupling reaction are recovered and reused in subsequent cyclization reactions. This reduces overall solvent consumption and waste generation while maintaining reaction efficiency and product purity
Solution Approach 2:
The patent employs green chemistry principles by selecting environmentally friendly solvents and optimizing reaction conditions to reduce energy consumption. Temperature and pressure parameters are optimized to minimize energy input while maintaining high yields, and the process is designed to operate under milder conditions that reduce environmental impact
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The process achieves high yields (up to 80%) and purity (>99.5%) of Compound A with reduced manufacturing time and costs, lower solvent usage, and minimal environmental impact, making it suitable for large-scale production.
Implementation Method 1
admixing 2-isopropyl-4-methylpyridin-3-amine (Compound B), or a salt thereof, a first base, and a reactive compound comprising phosgene or a phosgene equivalent in an organic solvent to form 3-isocyanato-2-isopropyl-4-methylpyridine (Compound C)
Implementation Method 2
admixing Compound C and 2,6-dichloro-5-fluoronicotinamide (Compound D) to form 2,6-dichloro-5-fluoro-N-((2-isopropyl-4-methylpyridin-3-yl)carbamoyl)nicotinamide (Compound E)
Implementation Method 3
admixing Compound E and a second base to form a product mixture comprising Compound A
Implementation Method 4
allowing direct crystallization and filtration of Compound A
Data Source
AI summary
Provided herein is a process for preparing compound A comprising (a) admixing 2-isopropyl-4-methylpyridin-3-amine (Compound B), or a salt thereof, a first base, and a reactive compound comprising phosgene or a phosgene equivalent in an organic solvent to form 3‑isocyanato-2-isopropyl-4-methylpyridine (Compound C); (b) admixing Compound C and 2,6-dichloro-5-fluoronicotinamide (Compound D) to form 2,6-dichloro-5-fluoro-N-((2-isopropy1-4-methylpyridin-3-yl)carbamoyl)nicotinamide (Compound E); and (c) admixing Compound E and a second base to form a product mixture comprising Compound A and the second base. Also provided herein is a process for synthesizing AMG 510 comprising using Compound A prepared according to the disclosed processes [Insert Structure] (Compound A).