derivatives, and 7-(2-acetamido-6-O-acetyl-2,3-dideoxy-α- d -threo-hex-2-enopyranosyl)theophylline and its β anomer. In addition to these 2′,3′-unsaturated nucleosides having the base linked at C-1′, three products of a new type, having the base attached at C-4′, were also isolated: 7-(methyl 2-acetamido-6-O-acetyl-2,3,4-trideoxy-β- d -erythro-hex-2-enopyranosid-4-yl)theophylline, and the corresponding
摘要在
三氟化硼醚化物存在下,将2-乙酰
氨基-3,4,6-三-O-乙酰基-1,5-脱
水-2-脱氧-d-
阿拉伯糖基己糖-1-烯醇与茶碱融合。催化剂,导致发生凝结。该反应提供了多种具有核苷特征的产物,其通过在
硅胶上重复色谱而连续分离。根据X射线晶体学分析(对于三种化合物),并通过核磁共振谱数据和质谱法,确定产物的结构如下:7-(2-乙酰
氨基-4,6-di -O-乙酰基-
2,3-二甲氧基-β-d-赤型-己基-2-烯
吡喃糖基)茶碱,相应的α-和β-d-苏
氨酸衍
生物以及7-(2-乙酰
氨基-6-O-乙酰基-2,3-二脱氧-α-d-苏-hex-2-enopyranosyl)茶碱及其β异构体。除了这些2' 还分离了具有在C-1'处连接的碱基的3'-不饱和核苷,在C-4'处连接了碱基的三种新型的新产物:7-(甲基2-乙酰
氨基-6-O-乙酰基- 2,3,4-
三甲氧基-β-d-赤型-己基-2-烯
吡喃糖基-4-基)