Lapatinib Synthesis via Formula X Intermediate
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Solution Overview
Problem
There is a need for an improved process to produce lapatinib and its pharmaceutically acceptable salts with higher selectivity and yield, as existing methods may not be efficient or stable for industrial production.
Innovation Solution
A process involving the conversion of a compound of formula (X) through reaction with SOCl2 in the presence of dimethylformamide (DMF), followed by reaction with 3-chloro-4-(3-fluorobenzyloxy)aniline and subsequent reductive amination to produce lapatinib or its pharmaceutically acceptable salt, such as the HCl salt, using specific solvents like tetrahydrofuran (THF) or acetonitrile (MeCN) to achieve high yield and stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If existing methods are used to produce lapatinib, then production can be maintained, but selectivity and yield are not sufficiently high for efficient industrial production
Solution Approach 1:
The patent applies preliminary action by pre-forming the compound of formula (X) with specific structural characteristics before the final coupling reaction. This intermediate structure is designed to enable subsequent high-selectivity transformation into lapatinib, thereby improving both yield and selectivity in the overall production process
Solution Approach 2:
The patent employs parameter changes by optimizing reaction conditions including solvent selection (acetonitrile, tetrahydrofuran), temperature control, and reagent ratios to achieve higher selectivity and yield in the conversion of compound (X) to lapatinib, resolving the contradiction between productivity and reliability
2Reliability
If existing methods are used to produce lapatinib, then production can continue, but the process is not stable for industrial production
Solution Approach 1:
The patent achieves process stability for industrial production by optimizing critical parameters including solvent systems (acetonitrile, tetrahydrofuran), reaction temperature ranges, and stoichiometric ratios. These parameter optimizations ensure consistent high-yield production while maintaining operational stability across industrial-scale operations
Solution Approach 2:
The compound of formula (X) serves as a stable intermediary that facilitates reliable industrial production. This intermediate compound provides a consistent starting point for lapatinib synthesis, enabling scalable and reproducible manufacturing processes with improved stability and efficiency
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
This process provides a stable and industrially suitable compound for lapatinib production with higher selectivity and yield, as demonstrated by the synthesis examples, including improved purity and yield in the production of lapatinib ditosylate and its conversion to the free base form.
Implementation Method 1
reacting a compound of formula (IX) with SOCl2 in the presence of dimethylformamide (DMF)
Implementation Method 2
subsequent reductive amination to produce lapatinib or its pharmaceutically acceptable salt
Data Source
AI summary
A compound of formula (X):which can be used as an intermediate to make lapatinib or its pharmaceutically acceptable salt.