Acta Crystallographica Section C

Crystal Structure Communications

Volume 58, Part 10 (October 2002)

Acta Cryst. (2002). C58, o593-o595    [doi:10.1107/S0108270102014944]

The regioisomeric 1H(2H)-pyrazolo[3,4-d]pyrimidine N¹- and N²-(2'-deoxy--D-ribofuranosides)

J.-L. He, F. Seela, H. Eickmeier and H. Reuter

Abstract: In the title regioisomeric nucleosides, alternatively called 1-(2-deoxy--D-erythro-furanosyl)-1H-pyrazolo[3,4-d]pyrimidine, C₁₀H₁₂N₄O₃, (II), and 2-(2-deoxy--D-erythro-furanosyl)-2H-pyrazolo[3,4-d]pyrimidine, C₁₀H₁₂N₄O₃, (III), the conformations of the glycosylic bonds are anti [-100.4  (2)° for (II) and 15.0  (2)° for (III)]. Both nucleosides adopt an S-type sugar pucker, which is C2'-endo-C3'-exo (²T₃) for (II) and 3'-exo (between ₃E and ⁴T₃) for (III).

Formula: Two regioisomers of C₁₀H₁₂N₄O₃

Online 21 September 2002

	Structure factor file (CIF format) (108.2 kbytes) Contains datablock II
	Structure factor file (CIF format) (77.0 kbytes) Contains datablock III

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