Several bioactive natural p-hydroxyphenylalkyl β-D-glucopyranosides, such as vanillyl β-D-glucopyranoside, salidroside and isoconiferin, and their glycosyl analogues were prepared by a simple reaction sequence. The highly efficient synthetic approach was achieved by utilizing acetylated glycosyl bromides as well as aromatic moieties and mild glycosylation promoters. The aglycones, p-O-acetylated arylalkyl alcohols, were prepared by the reduction of the corresponding acetylated aldehydes or acids. Various stereoselective 1,2-trans-O-glycosylation methods were studied, including the DDQ–iodine or ZnO–ZnCl2 catalyst combination. Among them, ZnO–iodine has been identified as a new glycosylation promoter and successfully applied to the stereoselective glycoside synthesis. The final products were obtained by conventional Zemplén deacetylation.
几种生物活性的天然p-羟基苯丙基β-D-葡萄糖苷,如香草基β-D-葡萄糖苷、沙利度苷和异云杉醇苷,以及它们的糖苷类似物,通过简单的反应序列制备。通过利用乙酰化的葡萄糖溴化物以及芳香基团和温和的糖苷化促进剂,实现了高效的合成方法。去糖基物质p-O-乙酰化芳基丙基醇是通过还原相应的乙酰化醛或酸制备的。研究了各种立体选择性的1,2-trans-O-糖基化方法,包括DDQ-碘或ZnO-ZnCl2催化剂组合。其中,ZnO-碘已被确认为一种新的糖苷化促进剂,并成功应用于立体选择性糖苷合成。最终产品通过传统的Zemplén去乙酰化获得。