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|January 9, 2007

Summary

This study reveals that 4-amino-1-(2-deoxy-beta-D-erythropentofuranosyl)-5-(prop-1-ynyl)pyrimidin-2(1H)-one exists in two distinct crystalline conformations. These conformations differ in glycosylic bond angles and sugar puckering, forming a stable 3D network via hydrogen bonds.

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Area of Science:

Crystallography
Organic Chemistry
Molecular Biology

Background:

The title compound, 4-amino-1-(2-deoxy-beta-D-erythropentofuranosyl)-5-(prop-1-ynyl)pyrimidin-2(1H)-one (C12H15N3O4), is a nucleoside analog.
Understanding the solid-state conformations of such compounds is crucial for predicting their behavior and interactions.

Purpose of the Study:

To elucidate the crystalline conformations of 4-amino-1-(2-deoxy-beta-D-erythropentofuranosyl)-5-(prop-1-ynyl)pyrimidin-2(1H)-one.
To characterize the structural differences between conformers in the crystalline state.

Main Methods:

Single-crystal X-ray diffraction analysis was employed to determine the crystal structure.
Conformational analysis focused on glycosylic bond torsion angles and sugar pucker.

Main Results:

Two distinct molecular conformations were identified in the crystalline state.
Both conformers adopted an anti glycosylic bond conformation (chi = -135.0(2)° and -156.4(2)°).
The sugar moieties exhibited a twisted C2'-endo pucker (S-type) with P values of 173.3° and 192.5°.

Conclusions:

The title compound displays conformational polymorphism in the solid state.
Intermolecular hydrogen bonds between the two conformers stabilize a three-dimensional crystal network.