申请人:WARNER-LAMBERT COMPANY
公开号:EP0171171A1
公开(公告)日:1986-02-12
A chemical process for preparing 2-β-D-ribofuranosylse- lenazole-4-carboxamide, comprises the steps of:
a) reacting 2,3,5-tri-O-benzoyl-β-D-ribofuranosyl-1-carbonitrile with gaseous hydrogen selenide, preferably in a 1:1 to 1:1.5 molar ratio, at a temperature and for a period sufficient to effect conversion of said 2,3,5-tri-O-benzoyl-β-D--ribofuranosyl-1-carbonitrile to 2,5-anhydro-3,4,6-tri-O--benzoyl-β-D-allonselenocarboxamide;
b) reacting said 2,5-anhydro-3,4,6-tri-O-benzoyl-β-D-allonselenocarboxamide with ethyl bromopyruvate to produce ethyl 2-(2,3,5-tri-O-benzoyl-β-D-ribofuranosyl)selenazole-4-carboxylate; and
c) thereafter converting said ethyl 2-(2,3,5-tri-O-benzoyl-β--B-ribofuranosyl)selenazole-4-carboxylate to 2-β-D-ribo- furanosylselenazole-4-carboxamide.
一种制备 2-β-D-ribofuranosylse- lenazole-4-carboxamide 的化学工艺,包括以下步骤: 1:
a) 将 2,3,5-三-O-苯甲酰基-β-D-呋喃核糖基-1-甲腈与气态硒化氢反应,最好以 1:1 至 1:1.5 的摩尔比进行反应,反应温度和反应时间足以使所述 2,3,5-三-O-苯甲酰基-β-D-呋喃核糖基-1-甲腈转化为 2,5-脱水-3,4,6-三-O-苯甲酰基-β-D-异硒甲酰胺;
b) 将所述 2,5-脱水-3,4,6-三-O-苯甲酰基-β-D-异戊烯甲酰胺与溴丙酮酸乙酯反应,生成 2-(2,3,5-三-O-苯甲酰基-β-D-呋喃核糖基)硒唑-4-甲酸乙酯;以及
c) 然后将所述 2-(2,3,5-三-O-苯甲酰基-β-B-呋喃核糖基)硒唑-4-甲酸乙酯转化为 2-β-D-呋喃核糖基硒唑-4-甲酰胺。