Photolabile 2-(2-Nitrophenyl)-propyloxycarbonyl (NPPOC) for Stereoselective Glycosylation and Its Application in Consecutive Assembly of Oligosaccharides
A photolabile protecting group (PPG) 2-(2-nitrophenyl)-propyloxycarbonyl (NPPOC) was explored in glycosylation and applied in the consecutive synthesis of oligosaccharides. NPPOC displays a strong neighboring group participation (NGP) effect to facilitate the construction of 1,2-trans glycosides in excellent yield. Notably, NPPOC could be efficiently removed by photolysis, and the deprotection conditions
A new glycosidation of α-d-altropyranosides, in which the 2-hydroxy group is not protected, was developed. The reaction proceeds via a 1,2-β-oxirane, which is formed in situ without extra steps for exchanging the 1-methoxy group to a more reactive leaving group. The glycoside bond of α-d-altropyranoside was shown to be weaker compared with those of α-d-glucopyranoside and α-d-mannopyranoside.
A novel approach to the stereoselective synthesis of β-d-mannopyranosides
作者:Sung-Kee Chung、Kyu-Hwan Park
DOI:10.1016/s0040-4039(01)00643-8
日期:2001.6
A non-covalent version of the intramolecular aglycon delivery methodology has been demonstrated for the stereoselective formation of β-d-mannopyranoside in the presence of lanthanide(III) triflate.
Barresi, Frank; Hindsgaul, Ole, Canadian Journal of Chemistry, 1994, vol. 72, # 6, p. 1447 - 1465
作者:Barresi, Frank、Hindsgaul, Ole
DOI:——
日期:——
Stereodivergent Mannosylation Using 2-<i>O</i>-(<i>ortho</i>-Tosylamido)benzyl Group
作者:Feiqing Ding、Akihiro Ishiwata、Yukishige Ito
DOI:10.1021/acs.orglett.8b01979
日期:2018.8.17
We report a novel strategy for obtaining both anomers from a single mannosyl donor equipped with a C2-o-TsNHbenzyl ether (2-O-TAB) by switching reaction conditions. In particular, the formation of various β-mannosides was achieved with high selectivity by using a mannosyl phosphite in the presence of ZnI2.