7-Iodo-8-aza-7-deaza-2′-deoxyadenosine and 7-bromo-8-aza-7-deaza-2′-deoxyadenosine

Abstract

The isomorphous structures of the title molecules, 4-amino-1-(2-deoxy-β-d-erythro-pento­furan­osyl)-3-iodo-1H-pyrazolo-[3,4-d]pyrimidine, (I), C10H12IN5O3, and 4-amino-3-bromo-1-(2-deoxy-β-d-erythro-pento­furan­osyl)-1H-pyrazolo[3,4-d]­pyrimidine, (II), C10H12BrN5O3, have been determined. The sugar puckering of both compounds is C1′-endo (1′E). The N-­glycosidic bond torsion angle χ1 is in the high-anti range [−73.2 (4)° for (I) and −74.1 (4)° for (II)] and the crystal structure is stabilized by hydrogen bonds.