Chemical-Enzymatic Synthesis of 3′-Amino-2′, 3′-dideoxy-β-D-ribofuranosides of Natural Heterocyclic Bases and Their 5′-Monophosphates
摘要:
Treatment of O-2,3'-anhydro-5'-O-trityl derivatives of thymidine (1) and 2'-deoxyuridine (2) with lithium azide in dimethylformamide at 150 degrees C resulted in the formation of the corresponding isomeric 3'-azido-2',3'-dideoxy-5'-O-trityl-beta-D-ribofuranosyl N1- (the major products) and N-3-nucleosides (3/4 and 5/6). 3'-Amino-2',3'-dideoxy-beta-D-ribofuranosides of thymidine [Thd(3'NH2)], uridine [dUrd(3'NH2)], and cytidine [dCyd(3'NH2)] were synthesized from the corresponding 3'-azido derivatives. The Thd(3'NH2) and dUrd(3'NH2) were used as donors of carbohydrate moiety in the reaction of enzymatic transglycosylation of adenine and guanine to afford dAdo(3'NH2) and dGuo(3'NH2). The substrate activity of dN(3'NH2) vs. nucleoside phosphotransferase of the whole cells of Erwinia herbicola was studied.