作者:G. Fakha、D. Sinou
DOI:10.3390/10080859
日期:——
Epoxidation and cis-hydroxylation of C-phenyl-∆2,3-glycopyranosides have beencarried out with a view to developing C-aryl glycoside synthesis. Epoxidation of (2,3- and (6-O-tert-butyldimethylsilyl-2,3-dideoxy-D-erythro-hex-2-enopyranosyl)benzenedideoxy-D-erythro-hex-2-enopyranosyl)benzene gave predominantly the allo-adductswhatever the configuration at the anomeric center. Epoxidation of (4,6-di-O-tert-butyl-dimethylsilyl-2,3-dideoxy-D-erythro-hex-2-enopyranosyl)benzene gave the manno- andallo-adducts in a 89:11 and 40:60 ratios for the α- and β-anomers, respectively.Hydroxylation of α-C-phenyl-∆2,3-glycopyranosides using OsO4 afforded the manno-adductonly, whatever the substituents at positions 4 and 6, whereas hydroxylation of (2,3-dideoxy-β-D-erythro-hex-2-enopyranosyl)benzene and (4,6-di-O-tert-butyldimethylsilyl-2,3-dideoxy- β-D-erythro-hex-2-enopyranosyl)benzene gave the manno- and allo-adducts in25:75 and 80:20 ratios, respectively.
为了发展 C-芳基糖苷的合成,对 C-苯基-Δ2,3-吡喃糖苷进行了环氧化和顺式羟化反应。(2,3-和(6-O-叔丁基二甲基硅基-2,3-二脱氧-D-赤式-己-2-烯吡喃糖基)苯二脱氧-D-赤式-己-2-烯吡喃糖基)苯的环氧化反应,无论异构中心的构型如何,都主要产生异构加合物。(4,6-二-O-叔丁基二甲基硅基-2,3-二脱氧-D-赤式-己-2-烯吡喃糖基)苯的环氧化反应生成了甘露加成物和异伞状加成物,α-异构体和β-异构体的比例分别为 89:11 和 40:60。使用 OsO4 对α-C-苯基-∆2,3-吡喃糖苷进行羟基化反应,无论第 4 和第 6 位的取代基如何,都只能得到甘露加合物,而对(2、3-二脱氧-β-D-赤式-己-2-烯吡喃糖基)苯和(4,6-二-O-叔丁基二甲基硅基-2,3-二脱氧-β-D-赤式-己-2-烯吡喃糖基)苯的羟基化反应得到了甘露加合物和烯丙基加合物,比例分别为 25:75 和 80:20 的比例生成甘露加成物和异羟加成物。