Treatment of 2,3,5-tri-O-benzoyl-beta-D-ribofuranosyl-1-carbonitrile with hydrogen selenide provided 2,5-anhydro-3,4,6-tri-O-benzoyl-D-allonselenoamide (3). Compound 3 was treated with ethyl bromopyruvate to provide ethyl 2-(2,3,5-tri-O-benzoyl-D-ribofuranosyl)selenazole-4-carboxylates, which after ammonolysis were converted to 2-beta-D-ribofuranosylselenazole-4-carboxamide (6) and its alpha-analogue
用
硒化氢处理2,3,5-三-O-苯甲酰基-β-D-
呋喃呋喃糖基-1-腈提供了2,5-脱
水-3,4,6-三-O-苯甲酰基-D-异壬酰胺(3 )。用
溴丙酮酸乙酯处理化合物3,得到2-(2,3,5-三-O-苯甲酰基-D-
呋喃呋喃糖基)
硒代
唑-4-羧酸乙酯,在
氨解后将其转化为2-β-D-
呋喃呋喃糖基
硒代唑-4。 -羧酰胺(6)及其α-类似物7。核苷6的乙酰化提供2-(2,3,5-三-O-乙酰基-β-D-
呋喃呋喃糖基)
硒唑-4-羧酰胺,6的
磷酸化提供相应的5'-
磷酸酯9。化合物6和9分别为被发现对培养中的P388和L1210细胞具有细胞毒性,并有效抵抗小鼠Lewis肺癌。