Co 2 (CO) 6 -propargyl cation mediates glycosylation reaction by using thioglycoside
作者:Meng-jie Xia、Wang Yao、Xiang-bao Meng、Qing-hua Lou、Zhong-jun Li
DOI:10.1016/j.tetlet.2017.05.012
日期:2017.6
glycosylation reaction by activating the thioglycoside donor. The glyco-oxacarbenium cation was formed by transferring the thio-aglycone to the cobalt-propargyl cation that was generated from the cobalt-propargylated acceptor in situ via the activating with Lewis acid. The reactivity of the donor (Armed or dis-armed) and the amount of the Lewis acid control the releasing rate of the cobalt-propargyl group.
Gold(III)-Catalyzed Glycosylation using Phenylpropiolate Glycosides: Phenylpropiolic Acid, An Easily Separable and Reusable Leaving Group
作者:Mukta Shaw、Rima Thakur、Amit Kumar
DOI:10.1021/acs.joc.8b02422
日期:2019.1.18
synthesized benchtop stable phenylpropiolate glycosyl (PPG) donors. Gold(III)-catalyzed activation of PPGs proceeds well with various carbohydrate and noncarbohydrate-based glycosyl acceptors and leads to their corresponding O/N-glycosides in good to excellent yields with regeneration of reusable and easily separable phenylpropiolic acid. Differentially protected PPGs reacted well under the optimized reaction
Halobenzoyl groups in glycosylation: effect on stereoselectivity and reactivity of glycosyl donors
作者:S. Visansirikul、J. P. Yasomanee、A. V. Demchenko
DOI:10.1007/s11172-015-0987-2
日期:2015.5
Described herein is the synthesis and evaluation of a series of glycosyldonors equipped with halobenzoyl substituents at O(4) and O(6) to study their properties in glycosylations. Among possible effects that may include carbonyl participation or H-bond mediated aglycone delivery, our results indicate that halobenzoyls act via a different mode.
本文描述的是一系列在 O(4) 和 O(6) 处配备卤代苯甲酰基取代基的糖基供体的合成和评估,以研究它们在糖基化中的特性。在可能包括羰基参与或 H 键介导的苷元传递的可能影响中,我们的结果表明卤代苯甲酰基通过不同的模式起作用。
Exploring the Dual Functions of Distal Acyl Group Direction in Various Nucleophilic Environments