Palbociclib Synthesis via Crystalline Intermediate Purification
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Solution Overview
Problem
Existing processes for preparing palbociclib struggle with removing palladium and other impurities to low levels, which is crucial for achieving high purity and safety standards in pharmaceutical formulations.
Innovation Solution
A process involving the reaction of compounds of formula (3) and (4) in a solvent mixture of methanol and butanol, followed by the isolation of a solid crystalline form of compound (2) characterized by specific XRPD patterns, and subsequent transformation into palbociclib, which effectively reduces palladium levels and impurities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional processes are used for preparing palbociclib, then the synthesis can be completed, but palladium and other impurities remain at unacceptable levels
Solution Approach 1:
The patent applies preliminary action by performing a specific crystallization step before the final transformation to palbociclib. The isolated solid crystalline form of compound (2) is obtained through controlled crystallization from a aqueous solvent mixture, which preliminary removes palladium and impurities before the compound is transformed into palbociclib, ensuring low impurity levels in the final product
Solution Approach 2:
The patent utilizes phase transitions by inducing crystallization of compound (2) from a liquid solvent mixture to obtain a solid crystalline form. This phase transition from dissolved state to crystalline solid enables separation and removal of palladium and other impurities, achieving the required purity levels for pharmaceutical use
2Manufacturing precision
If multiple purification steps are added to reduce palladium levels, then purity improves, but process complexity and cost increase
Solution Approach 1:
The patent performs the purification action preliminarily during the crystallization of compound (2) before the final transformation step. This single preliminary purification step, integrated into the existing process flow, achieves low palladium levels without requiring multiple separate purification operations, thereby maintaining process simplicity
Solution Approach 2:
The patent changes physical parameters by controlling crystallization conditions including solvent composition (aqueous mixture), temperature, and pH to obtain the isolated solid crystalline form of compound (2). These parameter changes enable effective palladium removal through a single crystallization step rather than multiple purification operations
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 proposed process results in a more economical and scalable method for producing palbociclib with significantly lower levels of palladium and other impurities, enhancing the product's purity and stability.
Implementation Method 1
Isolating solid crystalline form of compound (2) characterized by XRPD pattern having 2θ values 5.5°, 7.5°, 9.7°, 10.1°, 14.5°, 15.9°, 18.1°, 20.2° and 21.5° degrees 2 theta
Data Source
AI summary
The present invention relates to a process for preparation of palbociclib, compound of formula (1) or a salt thereof,wherein an intermediate, compound (2), is formed by reacting a compound of formula (3) and a compound of formula (4) in a solvent mixture comprising methanol and butanol:The intermediate (2) can be transformed into palbociclib or a salt thereof.