Dedicated to Professor Richard Schmidt for his seminal contributions to glycoside synthesis Abstract Adopting the ‘remote activation concept’ toward stereocontrolled glycoside synthesis with minimal use of protection groups, a general synthesis of phenolic 1,2-cis glycopyranosides is reported, as exemplified by aryl α-d-galacto-, α-d-gluco- and 2-azido α-d-glucopyranosides among others using glycosyl
[EN] N-ACETYLATED SIALIC ACIDS AND RELATED SIALOSIDES<br/>[FR] ACIDES SIALIQUES N-ACÉTYLÉS ET SIALOSIDES APPARENTÉS
申请人:UNIV CALIFORNIA
公开号:WO2018098342A1
公开(公告)日:2018-05-31
The present invention provides N-acetyl derivatives of sialic acids, including N-acetyl derivatives of Neu5Ac and Neu5Gc. Methods for preparing related precursors and a variety of sialosides are also disclosed.
A mild and efficient method for the selective cleavage of primary p-methoxybenzyl protecting group of saccharides by Co2(CO)8–Me2PhSiH–CO system
作者:Peng-zhan Qian、Wang Yao、Lu-bai Huang、Xiang-bao Meng、Zhong-jun Li
DOI:10.1016/j.tetlet.2015.07.051
日期:2015.9
A mild and efficient method to selectively cleave p-methoxybenzyl (PMB) ether with a catalytic amount of Co2(CO)8, hydrosilane and CO (1 atm) is presented. The cleavage reaction shows regioselectivity to primary O-PMB of a variety of permethoxybenzylated saccharides and chemoselectivity to O-Bn, sulfur-containing group and common ester protectinggroups.
Regioselective One-Pot Benzoylation of Triol and Tetraol Arrays in Carbohydrates
作者:Tong Li、Tianlu Li、Tongxiao Cui、Yajing Sun、Fengshan Wang、Hongzhi Cao、Richard R. Schmidt、Peng Peng
DOI:10.1021/acs.orglett.8b01446
日期:2018.7.6
Protection of 2,3,4-O-unprotected α-galacto- and α-fucopyranosides with BzCN and DMAP/DIPEA as the base afforded directly and regioselectively the 3-O-unprotected derivatives. The rationale for these studies was to take advantage of the eventual cooperativity of the “cyanide effect” and “the alkoxy group mediated diol effect”. This way, even the totally unprotected α-galactopyranosides could be regioselectively
A novel glycosylation procedure has been developed, featuring extremely low cost as well as experimental and environmental advantages. It is based on the direct activation of per-O-acetylated (or benzoylated) sugars by 5 mol % of cheap and eco-friendly methanesulfonic acid, under air in the absence of any solvent. Several products, including non-trivial glycosides and disaccharides, can be quickly