Hafnium(IV) tetratriflate in selective reductive carbohydrate benzylidene acetal opening reaction and direct silylation reaction
作者:Shino Manabe、Yukishige Ito
DOI:10.1016/j.tetlet.2013.10.011
日期:2013.12
regioselective reductive benzylidene ring opening with concurrent silylation reaction. The synthetic conditions were optimized, and the scope and limitations were identified. In addition to glucose and glycosamine derivatives, mannose and galactose were successfully employed as substrates. Various protecting groups such as acetyl, allyl, and benzyl were found to be stable under the reaction conditions. By using
四三氟甲磺酸((IV)被证明是有效的催化剂,用于同时进行甲硅烷基化反应的区域选择性还原性亚苄基开环。优化了合成条件,并确定了范围和局限性。除葡萄糖和糖胺衍生物外,甘露糖和半乳糖也被成功用作底物。发现各种保护基如乙酰基,烯丙基和苄基在反应条件下是稳定的。通过使用氘代还原剂,通过S N 1机理推断反应进行。
Total Synthesis and Structural Revision of TMG-chitotriomycin, a Specific Inhibitor of Insect and Fungal β-<i>N</i>-Acetylglucosaminidases
作者:You Yang、Yao Li、Biao Yu
DOI:10.1021/ja9055245
日期:2009.9.2
beta-N-acetylglucosaminidases that possesses an unique N,N,N-trimethyl-d-glucosamine (TMG) residue, is revised to be the TMG-beta-(1-->4)-chitotriose instead of the originally proposed alpha-anomer via its total synthesis, for which a highly convergent approach was developed in which the sterically demanding (1-->4)-glycosidic linkages are efficiently constructed by the Au(I)-catalyzed glycosylation protocol with glycosyl
Hafnium(IV) Tetratriflate as a Glycosyl Fluoride Activation Reagent
作者:Shino Manabe、Yukishige Ito
DOI:10.1021/jo400282x
日期:2013.5.3
Hafnium(IV) tetratriflate was found to be a activator of glycosyl fluoride. The protocol was operationally simple and was widely applicable to a variety of substrates in both solid-phase and solution-phase glycosylation reactions.