A new, scalable preparation of a glucopyranosylidene-spiro-thiohydantoin: one of the best inhibitors of glycogen phosphorylases
作者:László Somsák、Veronika Nagy
DOI:10.1016/s0957-4166(00)00107-5
日期:2000.5
per-O-benzoylated β-d-glucopyranosyl cyanide by mercury(II) cyanide in nitromethane. Partial hydrolysis of the nitrile with hydrogen bromide in acetic acid gave per-O-benzoylated C-(β-d-glucopyranosyl)formamide. Photobromination using bromine in carbon tetrachloride, chloroform, or dichloromethane gave the corresponding per-O-benzoylated 1-bromo-1-deoxy-β-d-glucopyranosyl cyanide and C-(1-bromo-1-deoxy-β-d-
在硝基甲烷中,氰化汞(II)将苯溴-葡萄糖转化为过邻苯甲酰化的β-d-吡喃葡萄糖基氰化物。用溴化氢在乙酸中腈的部分水解得到过-O-苯甲酰化的C-(β-d-吡喃葡萄糖基)甲酰胺。使用溴在四氯化碳,氯仿或二氯甲烷中进行光溴化,得到相应的过-O-苯甲酰化的1-溴-1-脱氧-β-d-吡喃葡萄糖基氰化物和C-(1-溴-1-脱氧-β-d-吡喃葡萄糖基)甲酰胺 后者与硫氰酸铵在硝基甲烷中的反应得到过-O-苯甲酰化的C- 6S构型的吡喃吡喃基亚烷基-螺-硫代乙内酰脲,以及少量的O-苯甲酰化的C-(1-羟基-β-d-吡喃葡萄糖基)甲酰胺。在甲醇中用甲醇钠对螺硫代乙内酰脲进行脱苯甲酰化,得到克量的标题抑制剂。所描述的序列应适合于按比例放大,并且可以从d-葡萄糖开始以约30%的总收率制备目标化合物。