One-pot synthesis of C-glycosylic compounds (C-glycosides) from d-glucal, p-tolylsulfenyl chloride and aromatic/heteroaromatic compounds in the presence of Lewis acids
作者:Leonid N Koikov、Irina P Smoliakova、Hui Liu
DOI:10.1016/s0008-6215(02)00123-4
日期:2002.8
In the presence of Zn(CN)(2), benzylated 2-thio-2-S-(p-tolyl)pyranosyl chlorides (2) generated in situ from tri-O-benzyl-D-glucal and p-TolSCl, smoothly react with thiophene, 2-methylthiophene, furan, 2-methylfuran, and N-methylpyrrole to give heteroaryl 2-thio-2-S-(p-tolyl)-C-beta-D-glucopyranosylic compounds (C-glycosides) in good yields. Upon treatment with SnCl(4), the reaction of chlorides 2 with
在Zn(CN)(2)存在的情况下,由三-O-苄基-D-葡糖醛和p-TolSCl原位生成苄基化的2-硫-2-S-(对甲苯基)吡喃糖基氯(2)与噻吩,2-甲基噻吩,呋喃,2-甲基呋喃和N-甲基吡咯反应,得到杂芳基2-硫代-2-S-(对甲苯基)-C-β-D-吡喃葡萄糖基化合物(C-糖苷)产量。用SnCl(4)处理后,氯化物2与噻吩或1,4-二甲氧基苯的反应提供了相应的苄基化C-β-D-葡糖呋喃糖基衍生物。在相同条件下,使用2-甲基噻吩,呋喃,2-甲基呋喃或N-甲基吡咯可产生(2S,3R,4R,5S)-1,3,4-三苄氧基-6,6-二杂芳基-5-(对甲苯硫基)-2-己醇。用AgBF(4)处理2和均三甲苯产生1,6-脱水3,4-二-O-苄基-2-硫-2-S-(对甲苯基)-β-D-葡萄糖。