Silodosin Synthesis via Reductive Amination and Protecting Group Strategy
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Solution Overview
Problem
The synthesis of Silodosin is complex and involves low yields due to over-alkylation issues in existing processes, leading to the production of undesired compounds.
Innovation Solution
A process involving reductive amination of specific intermediate compounds, such as those of Formula (VII) and (VIII), using suitable solvents and reducing agents like sodium cyanoborohydride, to achieve high yield and purity of Silodosin.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If alkylation of compound (X) by compound (Y) is used in the prior art process, then the synthesis can proceed through multiple steps, but over-alkylation occurs leading to undesired compounds and very low yields
Solution Approach 1:
The patent applies preliminary action by introducing a protecting group (benzyl group) on the nitrogen atom of compound (X) before the alkylation reaction. This preliminary protection prevents over-alkylation by blocking the nitrogen reactivity, allowing the reaction to proceed cleanly to the desired mono-alkylated product. The protecting group is subsequently removed in a controlled deprotection step to reveal the final product with high yield and purity.
2Ease of manufacture
If the prior art process is used for Silodosin synthesis, then the reaction can be performed with available reagents, but the yields are very low due to over-alkylation issues
Solution Approach 1:
The patent applies parameter changes by modifying the reaction conditions and sequence. Instead of direct alkylation, the process changes the order of operations: first protection of the nitrogen, then alkylation, and finally deprotection. This parameter change in the synthetic pathway transforms a low-yielding direct alkylation into a high-yielding multi-step process using readily available reagents.
3Manufacturing precision
If multiple steps are involved in the preparation of optically active amine compound and condensation, then the synthesis can achieve the desired product, but the process becomes relatively complex
Solution Approach 1:
The patent applies segmentation by dividing the complex synthesis into distinct modular steps: protection step, alkylation step, and deprotection step. Each step is optimized independently and can be performed with standard reagents and conditions. This segmentation reduces the complexity of each individual step while maintaining high overall purity and yield of the final product.
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 method overcomes the drawbacks of previous processes by achieving high yield and purity in the production of Silodosin, reducing the formation of undesired compounds and improving the overall efficiency of the synthesis.
Implementation Method 1
reductive amination of compound of Formula (VII) and compound of Formula (VIII) in a suitable solvent using a reducing agent
Data Source
AI summary
Processes for the preparation of Silodosin and its intermediates comprising reductive amination of compound of Formula (VIII) with a compound of Formula (VII) or a compound of Formula (XV) in a suitable solvent using a reducing agent.