SynthStrategy: Extracting and Formalizing Latent Strategic Insights from LLMs in Organic Chemistry

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Main Authors: Armstrong, Daniel, Jončev, Zlatko, Bran, Andres M, Schwaller, Philippe
Format: Preprint
Published: 2025
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author Armstrong, Daniel
Jončev, Zlatko
Bran, Andres M
Schwaller, Philippe
author_facet Armstrong, Daniel
Jončev, Zlatko
Bran, Andres M
Schwaller, Philippe
contents Modern computer-assisted synthesis planning (CASP) systems show promises at generating chemically valid reaction steps but struggle to incorporate strategic considerations such as convergent assembly, protecting group minimization, and optimal ring-forming sequences. We introduce a methodology that leverages Large Language Models to distill synthetic knowledge into code. Our system analyzes synthesis routes and translates strategic principles into Python functions representing diverse strategic and tactical rules, such as strategic functional group interconversions and ring construction strategies. By formalizing this knowledge as verifiable code rather than simple heuristics, we create testable, interpretable representations of synthetic strategy. We release the complete codebase and the USPTO-ST dataset -- synthesis routes annotated with strategic tags. This framework unlocks a novel capability for CASP: natural language-based route retrieval, achieving 75\% Top-3 accuracy on our benchmark. We further validate our library through temporal analysis of historical trends and chemically intuitive route clustering that offers more granular partitioning than common previous methods. This work bridges the tactical-strategic divide in CASP, enabling specification, search, and evaluation of routes by strategic criteria rather than structure alone.
format Preprint
id arxiv_https___arxiv_org_abs_2512_01507
institution arXiv
publishDate 2025
record_format arxiv
spellingShingle SynthStrategy: Extracting and Formalizing Latent Strategic Insights from LLMs in Organic Chemistry
Armstrong, Daniel
Jončev, Zlatko
Bran, Andres M
Schwaller, Philippe
Artificial Intelligence
Machine Learning
Modern computer-assisted synthesis planning (CASP) systems show promises at generating chemically valid reaction steps but struggle to incorporate strategic considerations such as convergent assembly, protecting group minimization, and optimal ring-forming sequences. We introduce a methodology that leverages Large Language Models to distill synthetic knowledge into code. Our system analyzes synthesis routes and translates strategic principles into Python functions representing diverse strategic and tactical rules, such as strategic functional group interconversions and ring construction strategies. By formalizing this knowledge as verifiable code rather than simple heuristics, we create testable, interpretable representations of synthetic strategy. We release the complete codebase and the USPTO-ST dataset -- synthesis routes annotated with strategic tags. This framework unlocks a novel capability for CASP: natural language-based route retrieval, achieving 75\% Top-3 accuracy on our benchmark. We further validate our library through temporal analysis of historical trends and chemically intuitive route clustering that offers more granular partitioning than common previous methods. This work bridges the tactical-strategic divide in CASP, enabling specification, search, and evaluation of routes by strategic criteria rather than structure alone.
title SynthStrategy: Extracting and Formalizing Latent Strategic Insights from LLMs in Organic Chemistry
topic Artificial Intelligence
Machine Learning
url https://arxiv.org/abs/2512.01507