The first C2 symmetrical macrocyclic receptor containing two sucrose molecules has been prepared, albeit in low yield, by reaction of hexa-O-benzyl-6′-O-acroyl-6-O-allylsucrose in the presence of a second generation Grubbs catalyst (1,3-dimesityl-4,5-dihydroimidazol-2-ylidene ruthenium alkylidene complex). Highly selective protection of the 6′-OH group in 1′,2,3,3′,4,4′-hexa-O-benzylsucrose was a key step in the preparation of the precursor used under ring closing metathesis (RCM) conditions.Key words: sucrose, macrocyclic receptors, metathesis, regioselective transformations.
通过六-O-苄基-6′-O-酰基-6-O-烯丙基蔗糖在第二代格拉布斯催化剂(1,3-二甲基-4,5-二氢咪唑-2-亚基钌亚烷基络合物)存在下的反应,制备出了第一个含有两个蔗糖分子的 C2 对称大环受体,尽管产量很低。对 1′,2,3,3′,4,4′-六-O-苄基蔗糖中的 6′-OH基团进行高选择性保护是在闭环套合(RCM)条件下制备前体的关键步骤。