The 2′-deoxyribofuranoside of 3-phenyltetrahydropyrimido[4,5-c]pyridazin-7-one: a bicyclic nucleoside with sugar residues in N and S conformations, and its molecular recognition
Abstract:The title compound 3-phenyltetrahydropyrimido[4,5-c]pyridazine 2′-deoxyribonucleoside [systematic name: 6-(2-deoxy-β-D-erythro-pentofuranosyl)-5,6,7,8-tetrahydro-3-phenylpyrimido[4,5-c]pyridazin-7-one monohydrate, C17H18N4O4·H2O, 1] shows two conformations in the crystalline state and the two conformers (1a and 1b) adopt different sugar puckers. The sugar residue of 1a shows a C2′-endo S-type conformation, while 1b displays a C3′-endo N-type sugar pucker. Both conformers adopt similar anti conformations around… Show more
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