作者:Robert D. Elliott、John A. Montgomery
DOI:10.1021/jm00232a004
日期:1976.10
converted to 8-azaguanosine (7c) and the corresponding 7- and 8-substituted isomers 7a and 7b. 4a-c were also converted with NaOMe to 6-O-methyl-8-azaguanosine (8c) and to the corresponding 7- and 8-substituted isomers 8a and 8b. The preferred route, however, to 6-substituted 8-azaguanosine analogues is an unambigous synthesis through N2-acetyl-6-(benzylthio)-N4-(2,3-O-isopropylidene-beta-D-ribofuranosyl)-5-nitro-2
描述了两种合成6-取代的8-氮杂鸟苷类似物的途径。2,5,6-三氨基-4(3H)-嘧啶硫酮(1)通过甲基化,亚硝化和乙酰化反应转化为-n-乙酰基-7-(甲硫基)-3H-1,2,3-三唑[4, 5-d]嘧啶-5-胺(5)。5与2,3,5-三-O-乙酰基-D-呋喃呋喃糖基氯的反应得到7-,8和9-(2,3,5-三-O-乙酰基-β-的混合物将其转化为8-氮杂鸟苷(7c)和相应的7-和8-取代的异构体7a和7b的D-核呋喃糖基)-8-氮杂嘌呤4a-c。还用NaOMe将4a-c转化为6-O-甲基-8-氮杂鸟苷(8c)以及相应的7-和8-取代的异构体8a和8b。然而,6-取代的8-氮杂鸟苷类似物的优选途径是通过N2-乙酰基-6-(苄硫基)-N4-(2,3-O-异亚丙基-β-D-呋喃呋喃糖基)-5-硝基的明确合成。 -2,由氯嘧啶10与氨基核糖11反应制备的4-嘧啶二胺(13)。催化氢化13得到氨基嘧啶