Nucleosides and Nucleotides. 192. Toward the Total Synthesis of Cyclic ADP-Carbocyclic-Ribose. Formation of the Intramolecular Pyrophosphate Linkage by a Conformation-Restriction Strategy in a<i>Syn</i>-form Using a Halogen Substitution at the 8-Position of the Adenine Ring
作者:Yuji Sumita、Michiyo Shirato、Yoshihito Ueno、Akira Matsuda、Satoshi Shuto
DOI:10.1080/15257770008033002
日期:2000.1
8-bromo-N6-trichloroacetyl-2',3'-O-isopropylideneadenosine 9c gave N-1-carbocyclic derivative, which was deprotected to give 5'-5"-diol derivatives 18. When 18 was treated with POCl3 in PO(OEt)3, the bromo group at the 8-position was replaced to give N-1-carbocyclic-8-chloroadenosine 5',5"-diphosphate derivative 19 in 43% yield. Treatment of 19 with 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide hydrochloride gave the
研究了作为环状ADP-核糖的稳定模拟物的环状ADP-碳环-核糖(2)的合成。通过缩合19的两个磷酸基团,成功实现了18元骨架结构的构建,这可能是由于在腺嘌呤部分使用8-氯取代基限制了顺式底物构象的缘故。通过先前开发的方法构建的旋光碳环单元8与8-溴-N6-三氯乙酰基-2',3'-O-异丙基亚氨腺苷9c之间的SN2反应生成N-1-碳环衍生物,将其脱保护为产生5′-5″-二醇衍生物18。当在PO(OEt)3中用POCl 3处理18时,在8位上的溴基被取代,得到N-1-碳环-8-氯腺苷5′,5″。 -二磷酸酯衍生物19,产率43%。用1-(3-二甲基氨基丙基)-3-乙基碳二亚胺盐酸盐处理19,以10%的产率得到所需的分子内缩合产物20。这是包含cADPR相关化合物与腺嘌呤碱基的分子内焦磷酸键的18元骨架结构的第一个化学结构。