A variety of alcohols react with 2,3,4,6-tetra-O-acetyl-1,5-anhydro-D-arabino-hex-1-enopyranose 1 in the presence of a catalytic amount of HClO4 supported on silica gel to give the corresponding alkyl 3-deoxy-hex-2-enopyranosides 2 in high yield, with short reaction times (10–45 mins) and good α-selectivity. Work-up merely involves filtration of the reagent, followed by chromatographic purification of the crude product. This methodology has also been employed in the synthesis of a bicyclic ether, a useful precursor for cyclic polyethers, and a 4-amino-C-glucoside.
在
硅胶负载的催化量
高氯酸(HClO4)存在下,多种醇与2,3,4,6-四-O-乙酰基-1,5-脱
水-D-阿拉伯型己-1-烯
呋喃糖1反应,高效地生成相应的烷基3-脱氧-己-2-烯
呋喃糖苷2,反应时间短(10–45分钟)且α-选择性良好。后处理仅涉及过滤试剂,随后对粗产品进行色谱纯化。这种方法也被应用于合成双
环醚(环状聚醚的有用前体)和4-
氨基-C-
葡糖苷。