A procedure has been devised whereby out of a pair of 2'-5'-and 3'-5'-positional isomers of 2-thiouridylyl- and uridylyluridine derivatives, the former could be selectively cleaved into halves through the 2, 2'-anhydronucleoside formation so that the isolation of the dinucleoside monophosphate having natural linkage may become easier. In this connection, conditions for selective 2, 2' anhydro-bond formation have been examined and 2-(t-butoxycarbonyl) phenyl group has been introduced as a protecting group for the phosphate of dinucleoside monophosphates (e.g., 8c and 9c). A simple procedure for the synthesis of 2, 2'-(S)-anhydro-2-thiouridylyl-(3'-5')-uridine was also described.
                                    设计了一种程序,其中从 2-
硫代尿
嘧啶基-和尿
嘧啶基
尿苷衍
生物的一对 2'-5'-和 3'-5'-位置异构体中,前者可以通过 2, 2'-选择性裂解成两半。脱
水核苷的形成使得具有天然键的二核苷单
磷酸的分离可以变得更容易。在这方面,已经检查了选择性2, 2'脱
水键形成的条件,并引入了2-(叔丁氧基羰基)苯基作为二核苷单
磷酸酯(例如8c和9c)的
磷酸酯的保护基团。还描述了合成 2, 2'-(S)-脱
水-2-
硫尿
嘧啶基-(3'-5')-
尿苷的简单程序。