Mono-Protected Diamino Alkane Synthesis via Borane Reduction
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Solution Overview
Problem
Current processes for synthesizing mono-protected α,ω-diamino alkanes suffer from low yields and require challenging chromatographic purification steps, making them inefficient and costly for industrial-scale production.
Innovation Solution
A process involving the conversion of a compound using a coupling reagent and subsequent treatment with a borane reagent followed by acid hydrolysis, which allows for high-yielding peptide coupling and efficient boron reduction steps without the need for chromatographic purification, achieving yields greater than 70% and chemical purity higher than 90%.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If reductive amination or alkylation routes are used to synthesize mono-protected α,ω-diamino alkanes, then the product can be obtained, but the yield is low (27-63%) and chromatographic purification is required
Solution Approach 1:
The patent changes the chemical parameters of the reaction system by using a two-stage process: first forming a protected intermediate compound, then reducing it with borane reagents. This parameter change in the reaction pathway eliminates the need for chromatographic purification while achieving >70% yield and >90% chemical purity, directly resolving the contradiction between productivity and ease of manufacture.
2Reliability
If Swern reaction is performed at -60°C to avoid side reactions, then aldehyde intermediates are stabilized, but the process becomes difficult to handle and purify on industrial scale
Solution Approach 1:
The patent applies preliminary protection by converting the aldehyde intermediate into a protected compound (Stage 1) before performing reduction. This preliminary action stabilizes the intermediate for industrial handling while maintaining reaction reliability, eliminating the need for low-temperature Swern conditions and enabling scalable manufacturing.
Solution Approach 2:
The protected intermediate compound acts as an intermediary species that bridges the aldehyde and final amine product. This intermediary is more stable and easier to handle industrially than the original aldehyde, while still allowing high-yield conversion to the final product through borane reduction.
3Productivity
If alkylation route is used with overnight heating at 60°C, then mono-protected α,ω-diamino alkanes can be formed, but decomposition and over-alkylation occur requiring chromatographic purification
Solution Approach 1:
The patent performs preliminary protection of one amino group before alkylation (Stage 1), which prevents over-alkylation of both amino groups. This preliminary action eliminates the formation of di-alkylated side products and decomposition, achieving >70% yield without requiring chromatographic purification.
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 significantly improves the yield and chemical purity of mono-protected α,ω-diamino alkanes, making them more efficient and cost-effective for industrial applications by eliminating the need for chromatographic purification steps.
Implementation Method 1
converting a compound of formula (I) into a compound of formula (II) by reacting a compound of formula (I) with a compound of formula (IV) in the presence of a coupling reagent
Implementation Method 2
treating the compound of formula (II) with a borane reagent
Implementation Method 3
followed by acid hydrolysis
Data Source
AI summary
The present invention relates to a process for the synthesis of mono-protected α,ω-diamino alkanes, the use of said proces in a process for the synthesis of a linker drug comprising an α,ω-diamino alkane moiety and the use of the process of the present invention in a process for preparing an antibody-drug conjugate comprising an α,ω-diamino alkane moiety.