Naphthyridine Synthesis via One-Pot Catalytic Sequences
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Solution Overview
Problem
Current processes for preparing naphthyridine derivatives are inefficient and costly, particularly for large-scale production, due to multiple steps, low yields, and the need for expensive catalysts and high pressures.
Innovation Solution
The development of processes involving transition metal catalyzed reactions, such as iridium C—H insertion/borylation followed by palladium-mediated Suzuki reactions, and biocatalytic reductions, which allow for the efficient synthesis of naphthyridine derivatives in two to three steps with high yields and cost-effectiveness, using commercially available materials and aqueous conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional multi-step processes are used for preparing naphthyridine derivatives, then chemical transformations can be achieved, but manufacturing time and costs increase significantly
Solution Approach 1:
The patent combines multiple reaction steps into a one-pot sequential process where Compound B undergoes C-H borylation followed by Suzuki coupling with Compound D in the same reaction vessel without isolation of intermediates. This merging of steps directly reduces manufacturing time and operational complexity while maintaining high yields.
Solution Approach 2:
The patent performs preliminary optimization of reaction conditions including catalyst selection (Ir code for borylation, Pd for Suzuki coupling), ligand optimization, and solvent selection before scale-up. This preliminary action ensures high efficiency and yield from the outset, preventing time losses during production scaling.
2Productivity
If conventional processes are used, then naphthyridine derivatives can be synthesized, but yields are low and costs are high
Solution Approach 1:
The patent optimizes critical parameters including catalyst loading (0.5-5 mol% Ir code, 1-10 mol% Pd catalyst), temperature (25-100°C depending on step), solvent selection (aqueous or organic), and reaction time to achieve maximum yields. These parameter optimizations directly improve productivity while reducing material waste and costs.
Solution Approach 2:
The patent replaces expensive, rare catalysts with more abundant and cost-effective transition metal catalysts (Ir code, Pd) that can be used at lower loadings. The use of commercially available starting materials and standard reagents further reduces manufacturing costs while maintaining high yields.
3Ease of manufacture
If traditional catalytic methods are used, then reactions can proceed, but expensive catalysts and high pressures are required
Solution Approach 1:
The patent replaces high-pressure mechanical conditions with ambient or mild temperature conditions (25-100°C) using optimized catalytic systems. The use of Ir code and Pd catalysts with appropriate ligands enables reactions to proceed under mild conditions, eliminating the need for expensive high-pressure equipment and reducing energy consumption.
Solution Approach 2:
The patent changes physical parameters from high pressure to ambient or mild temperature conditions, and from expensive catalysts to more affordable transition metal catalysts. This parameter optimization makes the process more accessible and cost-effective while maintaining high efficiency.
4Manufacturing precision
If complex purification steps are used, then product purity can be achieved, but unit operations increase and manufacturing becomes less efficient
Solution Approach 1:
The patent extracts and eliminates unnecessary intermediate isolation and purification steps from the conventional multi-step process. By performing sequential reactions in one pot and using highly selective catalysts, the process achieves high purity products with minimal unit operations, reducing complexity 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
These processes significantly reduce manufacturing timelines and costs, achieving high stereochemical purity and enantiomeric excess, with minimal unit operations and no need for extractions or distillations, enabling the production of naphthyridine derivatives in gram to metric ton quantities.
Implementation Method 1
admixing Compound F, or a salt thereof, with an imine reductase (IRED) to form Compound E, a stereoisomer thereof
Implementation Method 2
admixing Compound B with a first transition metal catalyst and a boron-containing compound to form Compound C
Implementation Method 3
admixing Compound C or Compound C′ with Compound D and a second transition metal catalyst to form Compound A or a salt thereof
Data Source
AI summary
The disclosure provides processes for preparing Compound A, Compound E, Compound I, salts thereof, and/or stereoisomers thereof, as described herein.