Synthesis of 4-cyanophenyl 1,5-dithio-β-d-glucopyranoside and its 6-deoxy, as well as 6-deoxy-5-ene derivatives as oral antithrombotic agents
作者:Éva Bozó、Sándor Boros、János Kuszmann
DOI:10.1016/s0008-6215(97)10041-6
日期:1997.11
approximately 1:8:1. Compound 30 could be obtained in a higher overall yield using 2 as starting material and converting it via its 4-cyanophenyl 2,3,4-tri-O-acetyl-6-O-methanesulfonyl-1,5-dithio-beta-D-glucopyranoside derivative into the 4-cyanophenyl 2,3,4-tri-O-acetyl-6-deoxy-6-iodo-1,5-dithio-beta-D-glucopyranoside 33 which gave 30 on reduction with sodium borohydride-nickel(II) chloride. Treatment
在三氟甲磺酸三甲基甲硅烷基酯的存在下,将5-硫代-D-吡喃葡萄糖五乙酸酯与4-氰基苯硫醇缩合,得到4-氰基苯基2,3,4,6-四-O-乙酰基-1,5-二硫代-α-D-吡喃葡萄糖苷7和3,4,6-三-O-乙酰基-2,5-脱水5-硫代-D-甘露糖双(4-氰基苯基)二硫缩醛9的比例为2:3。后者可能由4-氰基苯基2,3,4,6-四-O-乙酰基-1,5-二硫基-β-D-吡喃葡萄糖苷6通过环硫原子的跨环参与而形成。当使用2,3,4,6-四-O-乙酰基-5-硫代α-D-吡喃葡萄糖基溴作为供体,并且反应在碳酸钾存在下进行时,则6,7,4,4-氰基- 2-(2,3,4,6-四-O-乙酰基-5-硫代-α-D-吡喃葡萄糖基)苯基和4-氰基-2-(2,3,4,6-四-O-乙酰基-以23:4:2:1的比例形成5-硫代-β-D-吡喃葡萄糖基)苯基1,5-二硫代-β-D-吡喃葡萄糖苷(14和16)。讨论了14和16的形成机理。在碳酸钾存在下,将2