Stereodivergent Route to the Carbocyclic Core of 2′,3′-Olefinic Carbanucleosides: Toward the Synthesis of (l)-(+)- and (d)-(−)-Carbovir

The Convenient Synthesis of Unsaturated Nucleoside Analogues in Water under Microwave Irradiation

A convenient method for the regioselective synthesis of unsaturated nucleoside analogs in water under microwave irradiation was developed. All pyrimidine and purine nucleoside derivatives were exclusively alkylated at N1 and N9 respectively in good to excellent yields. In addition, this system could tolerate a broad range of functional groups, such as chloro, bromo, iodo, alkyl, amino, and hydroxyl groups. More importantly, the reaction scale could be enlarged to 50 mmol which made this route attractive for industrial application.