Macrolide Synthesis via Modular Coupling for Antibiotic Stability
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Emerging resistance to antibiotics, particularly in Staphylococcus aureus, Streptococcus pyogenes, and Streptococcus pneumoniae, poses a global health crisis due to rapid gene transmission and inadequate new antibiotic development, with existing macrolides facing challenges like acid instability and resistance mechanisms.
Innovation Solution
A fully synthetic route for making macrolides through the coupling of western and eastern halves, allowing for various linkages and modifications such as Wittig or Homer-Emmons reactions, to produce compounds with improved stability and efficacy against resistant bacteria.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If macrolides are prepared through semi-synthesis from fermentation products, then the structural complexity is managed, but the manufacturing route becomes lengthy (up to 16 steps) and less efficient
Solution Approach 1:
The patent applies segmentation by dividing the macrolide molecule into distinct modular components (e.g., the 14-membered lactone ring system and side chain substituents) that can be synthesized and assembled separately. This modular approach enables more efficient construction of complex macrolide structures compared to traditional step-by-step semi-synthesis from natural products.
2Reliability
If erythromycin is used to treat bacterial infections, then antibacterial activity is achieved, but acid-promoted internal ketalization occurs leading to adverse gastrointestinal events
Solution Approach 1:
The patent applies local quality by introducing specific chemical modifications at particular positions on the macrolide ring structure (such as cladinose substitution or keto-group modifications) to locally alter the molecule's chemical stability and resistance to acid-promoted ketalization, thereby reducing gastrointestinal side effects while preserving antibacterial activity.
3Stability of the object's composition
If macrolide structure is modified to improve acid stability, then gastrointestinal tolerance improves, but the ability to address emerging antibiotic resistance may be compromised
Solution Approach 1:
The patent applies parameter changes by systematically varying chemical parameters such as ring size (14-, 15-, or 16-membered macrolides), substituent types (cladinose, keto groups, fluorine atoms), and side chain configurations to optimize both acid stability and antibacterial spectrum, enabling the development of macrolides that simultaneously improve gastrointestinal tolerance and maintain or enhance activity against resistant organisms.
Data Source
AI summary
Provided herein are methods of preparing macrolides by the coupling of an eastern and western half, followed by macrocyclization, to provide macrolides, including both known and novel macrolides. Intermediates in the synthesis of macrolides including the eastern and western halves are also provided. Pharmaceutical compositions and methods of treating infectious diseases and inflammatory conditions using the inventive macrolides are also provided. A general diastereoselective aldol methodology used in the synthesis of the western half is further provided.