Enzymatic deamination of adenosine 1-N-oxide gave 1-hydroxyinosine (2a) which was acetylated and then chlorinated to give 2,6-dichloro-9-(2,3,5-tri-O-acetyl-(β-D-ribofuranosyl)purine (3). Ammonia in dry 1,2-dimethoxyethane converted 3 into 2-chloro-adenosine triacetate (4a). Treatment of 4a with trimethylamine at elevated temperatures in acetonitrile resulted in formation of 2-N,N-dimethylaminoadenosine triacetate (4b). Guanosine (5) was acetylated smoothly by an improved procedure. The resulting triacetate (6) was chlorinated in ∼85% yield to give 2-amino-6-chloro-9-(2,3,5-tri-O-acetyl-β-D-ribofuranosyl)purine (7). Treatment of 7 with trimethylamine at ambient temperature for 28 hours gave the 6-N,N-dimethylamino compound (8d). However, potassium fluoride or sodium azide with catalytic quantities of trimethylamine in DMF or acetonitrile gave the 2-amino-6-fluoro (8a) or 2-amino-6-azido (8b) products in yields of greater than 90%.
腺苷1-N-氧化物经酶促脱氨基作用生成1-羟基次黄嘌呤(2a),随后乙酰化并氯化得到2,6-二氯-9-(2,3,5-三-O-乙酰-(β-D-核糖呋喃糖基)嘌呤(3)。干燥的1,2-二甲氧基乙烷中的氨转化3为2-氯腺苷三乙酸酯(4a)。在乙腈中,用三甲胺在高温下处理4a导致形成2-N,N-二甲基氨基腺苷三乙酸酯(4b)。瓜嘌呤(5)通过改进的方法顺利地被乙酰化。得到的三乙酸酯(6)在约85%的产率下氯化,生成2-氨基-6-氯-9-(2,3,5-三-O-乙酰-β-D-核糖呋喃糖基)嘌呤(7)。用三甲胺在室温下处理7 28小时,得到6-N,N-二甲基氨基化合物(8d)。然而,钾氟化物或氯化钠与DMF或乙腈中的催化量三甲胺反应,产率大于90%地生成2-氨基-6-氟(8a)或2-氨基-6-叠氮(8b)产物。