作者:Hideki Jona、Hiroki Mandai、Warinthorn Chavasiri、Kazuya Takeuchi、Teruaki Mukaiyama
DOI:10.1246/bcsj.75.291
日期:2002.2
A catalytic and stereoselective glycosylation of various glycosyl acceptors, such as methyl glycosides, thioglycosides, or a disarmed glycosyl fluoride, with benzyl-protected armed glycosyl fluoride was successfully carried out by using various protic acids in the presence of MS 5A. In the cases when trifluoromethanesulfonic acid (TfOH) or perchloric acid (HClO4) was used in diethyl ether (Et2O), α-glycosides
在 MS 5A 存在下,使用各种质子酸成功地进行了各种糖基受体(如甲基糖苷、硫糖苷或脱臂糖基氟)与苄基保护的武装糖基氟的催化和立体选择性糖基化。在三氟甲磺酸 (TfOH) 或高氯酸 (HClO4) 用于乙醚 (Et2O) 的情况下,主要产物为 α-糖苷,而当四(五氟苯基)硼酸 [HB(C6F5) )4] 用于三氟甲基苯 (BTF)-新戊腈 (tBuCN) = 5:1 的混合溶剂中。这种糖基化的立体选择性受催化剂抗衡阴离子的性质以及溶剂的性质控制。还,