Synthesis and Evaluation as Glycosidase Inhibitors of Isoquinuclidines Mimicking a Distortedβ-Mannopyranoside
作者:Matthias Böhm、Edwige Lorthiois、Muthuppalaniappan Meyyappan、Andrea Vasella
DOI:10.1002/hlca.200390320
日期:2003.11
Racemic and enantiomerically pure manno-configured isoquinuclidines were synthesized and tested as glycosidase inhibitors. The racemic key isoquinuclidine intermediate was prepared in high yield by a cycloaddition (tandem Michael addition/aldolisation) of the 3-hydroxy-1-tosyl-pyridone 10 to methyl acrylate, and transformed to the racemic N-benzyl manno-isoquinuclidine 2 and the N-unsubstituted manno-isoquinuclidine
合成了外消旋和对映体纯的甘露聚糖构型的异喹核苷,并作为糖苷酶抑制剂进行了测试。通过将3-羟基-1-甲苯基-吡啶酮10与丙烯酸甲酯的环加成(串联迈克尔加成/醛醇缩合)制得外消旋键异喹核苷中间体,并转化为外消旋N-苄基甘露糖异喹核苷2和外消旋N-苄基甘露糖异吡啶核苷。N-未取代的甘露糖-异喹核苷3(十二个步骤;从10占约11%)。奎宁催化10的类似环加成反应丙烯酸(-)-8-苯基薄荷酯提供了一个高收率的单一非对映异构体,将其转变为所需对映体纯的D-甘露糖异喹核苷(+)- 2和(+)- 3(十二个步骤;从10占23%) 。对映体(-)- 2和(-)- 3通过使用奎尼丁促进的丙烯酸10对映体(+)-8-苯基薄荷基的环加成反应来制备。的Ñ -苄基D-甘露-isoquinuclidine(+) - 2是一种选择性和蜗牛慢抑制剂β甘露糖苷酶。其抑制强度和抑制类型取决于pH值(在pH 4.5时:K i=1