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The mol­ecule of the title compound, C19H23N5O3, contains six-membered pyrimidine and five-membered imidazole rings merged into the essentially planar purine skeleton (r.m.s. deviation = 0.01 Å). In the crystal, pairs of N—H...N hydrogen bonds link mol­ecules into inversion dimers. The dimers are linked via C—H...O hydrogen bonds, forming double-stranded chains propagating along [001]. These chains are linked via C—H...π and parallel slipped π–π inter­actions [centroid–centroid distance = 3.467 (1) Å; slippage 0.519 Å], forming a three-dimensional network.

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The title compound, C17H19N5O2, features an almost planar purine skeleton (r.m.s. deviation = 0.009 Å) substituted by a tetra­hydro­furan ring, which adopts an envelope conformation. The purine and benzene rings subtend a dihedral angle of 66.70 (3)°. In the crystal, pairs of N—H...N hydrogen bonds connect adjacent mol­ecules into inversion dimers. C—H...N, C—H...O, C—H...π and π–π inter­actions [pyrimidine ring centroid–centroid distance = 3.3909 (1) Å] connect the dimers into a three-dimensional architecture.
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