2,6-Dichloro-1-deazapurine and 2,6-dichloro-3-deazapurine were coupled with 1,2-O-diacetyl-5-O-benzoyl-3-deoxy-beta -D-ribofuranose. Deprotection of the obtained compounds and reaction with liquid ammonia gave the desired 2-chloroadenine nucleosides, which were dechlorinated to afford the corresponding 1-deaza and 3-deazaadenosine derivatives. Biological studies performed on ADA from calf intestine showed that these new nucleosides are inhibitors of the enzyme.
Coupling of 2,6-Dichloropurine and 2,6-Dichlorodeazapurines with Ribose and Ribose Modified Sugars
Substituted purine and deazapurine nucleosides are of great interest in medicinal chemistry. Furthermore, 3'-deoxynucleosides exhibit a number of biological activities. In this research the coupling of 2,6-dichloro-1- or 3-deazapurine with protected 3'-deoxyribose is reported. Depending upon coupling conditions and base structure, different anomeric and isomeric mixtures have been obtained. Extensive studies, utilizing chemical and physical methods, have been performed to assign the correct configuration to the resulting nucleosides.