Sitagliptin Intermediate Synthesis via Fatty Acid Catalyzed Reduction
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Solution Overview
Problem
Conventional methods for preparing sitagliptin intermediate compounds are hindered by the use of expensive reagents and catalysts, making them unsuitable for industrial production.
Innovation Solution
A method involving the reduction of carbon-carbon double bonds using chlorosilane under catalysis of C1∼C6 saturated fatty acids, avoiding the need for precious metals and simplifying the process, with conditions optimized for high yields and purity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional methods use precious metal catalysts (platinum oxide, rhodium) to construct chiral amino, then chiral amino construction is achieved, but production costs increase and industrial suitability decreases
Solution Approach 1:
The patent replaces expensive precious metal catalysts (platinum oxide, rhodium) with inexpensive organic compounds as catalysts. Specifically, it uses chiral organic compounds containing amino groups and carbonyl groups that can form cyclic structures, which are much cheaper and more suitable for industrial production while maintaining the ability to construct chiral amino groups in sitagliptin intermediates
Solution Approach 2:
The patent changes the fundamental parameter of catalyst type from inorganic precious metals to organic compounds. The organic catalysts work through different mechanisms (forming cyclic structures via amino and carbonyl groups) compared to traditional metal-catalyzed hydrogenation, enabling cost-effective chiral amino construction suitable for large-scale production
2Manufacturing precision
If conventional methods use expensive reagents and catalysts, then chiral amino construction is achieved, but overall production cost increases
Solution Approach 1:
The patent employs inexpensive organic catalysts containing amino and carbonyl groups that can form cyclic structures, replacing costly precious metal catalysts. These organic compounds are significantly cheaper while effectively enabling chiral amino construction, thereby reducing overall production costs without sacrificing manufacturing precision
Solution Approach 2:
The patent creates a new catalytic system that copies the essential function of precious metal catalysts (enabling chiral amino construction) but uses fundamentally different, cheaper organic materials. The organic catalysts replicate the chiral induction capability through molecular structure design rather than relying on expensive metal centers
3Manufacturing precision
If conventional methods add protection steps, then chiral amino construction is achieved, but process complexity increases
Solution Approach 1:
The patent extracts and eliminates unnecessary protection steps from the conventional synthetic route. By using organic catalysts with specific amino and carbonyl groups that form cyclic structures, the method achieves direct chiral amino construction without requiring additional protection/deprotection steps, thereby simplifying the overall synthetic process while maintaining manufacturing precision
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 approach results in high chemical and optical purity with yields greater than 99.6%, reducing costs and making the process suitable for industrial production.
Implementation Method 1
performing a reduction reaction of carbon-carbon double bonds with chlorosilane under catalysis of C 1 ∼C 6 saturated fatty acid
Implementation Method 2
performing a reduction reaction of carbon-carbon double bonds with chlorosilane under catalysis of C 1 ∼C 6 saturated fatty acid
Data Source
AI summary
The present invention provides a method for preparing an intermediate compound of sitagliptin represented by formula I. The preparation method comprises: dissolving a compound represented by formula II into an organic solvent; and under the catalysis of fatty acid and effect of chlorosilane, performing a reduction reaction of carbon-carbon double bonds, so as to obtain the intermediate compound of sitagliptin represented by formula I, R being methyl or formoxyl. Te preparation method of the present invention avoids precious metal as a catalyst, and accordingly, the cost is low, the post-treatment is simple, the product has a high yield, chemical purity and optical purity, and de% is greater than 99.6%, and the preparation method can be used in synthesis of sitagliptin and is suitable for industrial production.