首页> 美国卫生研究院文献>Nucleic Acids Research >A new synthesis of certain 7-(beta-D-ribofuranosyl) and 7-(2-deoxy-beta-D-ribofuranosyl) derivatives of 3-deazaguanine via the sodium salt glycosylation procedure.
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A new synthesis of certain 7-(beta-D-ribofuranosyl) and 7-(2-deoxy-beta-D-ribofuranosyl) derivatives of 3-deazaguanine via the sodium salt glycosylation procedure.

机译:通过钠盐糖基化方法的3-脱氮鸟嘌呤的某些7-(β-D-呋喃核糖基)和7-(2-脱氧-β-D-呋喃核糖基)衍生物的新合成。

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摘要

A facile synthesis of 7-beta-D-ribofuranosyl-3-deazaguanine (1) and certain 8-substituted derivatives of 1 via the sodium salt glycosylation method has been developed. Glycosylation of the sodium salt of methyl 2-chloro(or methylthio)-4(5)-cyanomethylimidazole-5(4)-carboxylate (5 and 13b) with 2,3,5-tri-O-benzoyl-D-ribofuranosyl bromide (6) gave exclusively methyl 2-chloro(or methylthio)-4-cyanomethyl-1-(2,3, 5-tri-O-benzoyl-beta-D-ribofuranosyl)imidazole-5-carboxylate (7 and 14a), respectively. Ammonolysis of 7 and 14a provided 6-amino-2-chloro(or methylthio)-3-beta-D-ribofuranosylimidazo-[4,5-c]pyridin-4(5H)-one (11 and 17), which on subsequent dehalogenation (or dethiation) gave 1. Similarly, reaction of the sodium salt of 5 and 13b with 1-chloro-2-deoxy-3,5-di-O-p-toluoyl-alpha-D-erythro-pentofuranose (8), and ammonolysis of the glycosylated imidazole precursors (9 and 16) gave 6-amino-2-chloro(or methylthio)-3-(2-deoxy-beta-D-erythro-pentofuranosyl) imidazo[4,5-c]-pyridin-4(5H)-one (10a and 15), respectively. Dehalogenation of 10a or dethiation of 15 gave 2'-deoxy-7-beta-D-ribofuranosyl-3-deazaguanine (10b). This procedure provided a direct method of obtaining 10b without the contaminating 9-glycosyl isomer 4.
机译:已经开发了通过钠盐糖基化方法轻松合成7-β-D-呋喃核糖基-3-脱氮鸟嘌呤(1)和某些8取代的1的衍生物。 2-氯(或甲硫基)-4(5)-氰基甲基咪唑-5(4)-羧酸甲酯(5和13b)的钠盐与2,3,5-三-O-苯甲酰基-D-呋喃呋喃糖基溴化物的糖基化(6)仅得到2-氯(或甲硫基)-4-氰基甲基-1-(2,3,5-三-O-苯甲酰基-β-D-核呋喃糖基)咪唑-5-羧酸甲酯(7和14a),分别。 7和14a的氨解提供了6-氨基-2-氯(或甲硫基)-3-β-D-呋喃呋喃基氨基咪唑-[4,5-c]吡啶-4(5H)-一(11和17),随后脱卤(或去硫)反应得到1。类似地,5和13b的钠盐与1-氯-2-脱氧-3,5-二-Op-甲苯酰基-α-D-赤型戊呋喃糖(8)反应,以及糖基化的咪唑前体(9和16)的氨解反应得到6-氨基-2-氯(或甲硫基)-3-(2-脱氧-β-D-赤型-戊呋喃糖基)咪唑并[4,5-c]-吡啶- 4(5H)-1(10a和15)。 10a脱卤或15脱硫得到2'-脱氧-7-β-D-呋喃呋喃糖基-3-脱氮鸟嘌呤(10b)。该程序提供了直接获得10b且不污染9-糖基异构体4的方法。

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