Forward Synthon Generation for 3D Shape Similarity Screening
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Solution Overview
Problem
Current computer-aided organic synthesis methods primarily focus on retrosynthetic analysis and are limited in generating a diverse range of three-dimensional shapes, failing to effectively explore the chemical space for pharmacologically interesting molecules, and lack a systematic approach to identify synthons with similar shapes and reactivities to query molecules.
Innovation Solution
A computer-aided method that recursively generates synthons with open valences through established organic chemical reactions, characterizes them using topomeric metrics, and stores them in a database for similarity searching, enabling the identification of synthons with complementary reactivity and shape to query fragments for potential biological activity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If retrosynthetic analysis methods are used to generate molecular structures, then the focus remains on synthesizing specific target molecules, but the diversity of three-dimensional shapes explored is limited
Solution Approach 1:
The patent inverts the traditional retrosynthetic approach by performing forward synthesis planning. Instead of starting from a target molecule and working backward to identify synthons, the system starts with available reagents and recursively applies chemical reactions to generate diverse molecular structures forward in time. This inversion enables exploration of broader three-dimensional shape space while maintaining connection to synthetically accessible compounds.
Solution Approach 2:
The system pre-generates a comprehensive library of molecular structures through recursive forward synthesis before any target molecule is specified. By performing preliminary structure generation from reagent libraries using established chemical reactions, the system creates a diverse pool of candidate molecules with varying three-dimensional shapes that can then be screened against pharmacological targets.
2Adaptability or versatility
If a comprehensive search of chemical space is performed to find pharmacologically interesting molecules, then the diversity of structures increases, but the time and computational resources required increase significantly
Solution Approach 1:
The patent segments the chemical space exploration into manageable components by organizing molecules based on their synthon building blocks. Instead of evaluating entire molecules simultaneously, the system decomposes structures into reusable synthon units that can be independently generated, stored, and recombined. This segmentation enables efficient database storage and rapid retrieval of structurally related compounds.
Solution Approach 2:
The system creates virtual copies of molecular structures through computational modeling rather than physical synthesis. By generating digital representations of molecules and their three-dimensional shapes in silico, the system can screen vast numbers of candidate structures without consuming physical materials or experimental time, significantly reducing the time required for initial screening.
3Ease of manufacture
If established organic chemical reactions are used to generate synthons, then the synthesizability of generated molecules is improved, but the diversity of resulting molecular shapes is reduced
Solution Approach 1:
The patent implements continuous recursive application of chemical reactions to reagent libraries. Instead of performing a single round of reaction application, the system continuously applies established organic reactions to generated products, which become new reagents for subsequent reaction steps. This continuous iterative process maintains connection to synthetically accessible chemistry while progressively expanding molecular diversity and three-dimensional shape variety over multiple generation cycles.
Data Source
AI summary
A forward synthetic method is described that utilizes recursive application of established organic chemical reactions to derive more complex synthons from available reagents than are available from the reagent synthons themselves. The product of each reaction serves as the starting point for further reactions thereby permitting the generation of multiple complex molecular structures. This synthon generation procedure typically yields 20 ? 30 new structures within the limits of easily accessible syntheses based upon each starting reagent. More complex syntheses yield even more structures. The generated synthons are characterized with a molecular structural descriptor possessing a neighborhood property and can be further characterized with features. The synthons are searched for three dimensional shape and feature similarity to molecular fragments derived from query molecules, typically pharmacological molecules of interest. Identified synthons can be assembled into molecules possessing the same three dimensional shape and likely activity as the molecule of interest.