Guasch L, Sitzmann M, Nicklaus MC. Enumeration of ring-chain tautomers based on SMIRKS rules.
J Chem Inf Model 2014;
54:2423-32. [PMID:
25158156 PMCID:
PMC4170818 DOI:
10.1021/ci500363p]
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Abstract
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A compound
exhibits (prototropic) tautomerism if it can be represented by two
or more structures that are related by a formal intramolecular movement
of a hydrogen atom from one heavy atom position to another. When the
movement of the proton is accompanied by the opening or closing of
a ring it is called ring–chain tautomerism. This type of tautomerism
is well observed in carbohydrates, but it also occurs in other molecules
such as warfarin. In this work, we present an approach that allows
for the generation of all ring–chain tautomers of a given chemical
structure. Based on Baldwin’s Rules estimating the likelihood
of ring closure reactions to occur, we have defined a set of transform
rules covering the majority of ring–chain tautomerism cases.
The rules automatically detect substructures in a given compound that
can undergo a ring–chain tautomeric transformation. Each transformation
is encoded in SMIRKS line notation. All work was implemented in the
chemoinformatics toolkit CACTVS. We report on the application of our
ring–chain tautomerism rules to a large database of commercially
available screening samples in order to identify ring–chain
tautomers.
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