of glycosylthioimidates, glycosyl N-phenyl-trifluorothioacetimidates, were prepared from the readily available glycosyl thiols in excellent yields. These imidates exhibited very good donor properties under the action of catalytic amounts of BF3·Et2O, and the corresponding glycosidation products were formed in very good to excellent yields. Thus, the first catalyticglycosylations with glycosyl thioimidate
作者:Manibarsha Goswami、Arkady Ellern、Nicola L. B. Pohl
DOI:10.1002/anie.201304099
日期:2013.8.5
A straightforward method utilizing a bismuth(V) compound was developed for the activation of thiopropylglycosides for coupling to various acceptors; good to excellent yields were obtained without applying additional additives/co‐promoters. The method does not require low temperatures, is applicable to a wide variety of carbohydrates, and tolerates different functional groups including alkenes.