Selective Acetylation of per-<i>O</i>-TMS-Protected Monosaccharides
作者:Mark A. Witschi、Jacquelyn Gervay-Hague
DOI:10.1021/ol101751d
日期:2010.10.1
Selective acetylation of various per-O-TMS-protected carbohydrates has been accomplished. Using a protecting group exchange strategy and microwave assistance, monosaccharides (glucose, galactose, and mannose) can be selectively acetylated producing either the 6-O-monoacetate or 1,6-O-diacetylated species. This new class of molecules can be deprotected without migration of the acetyl groups, providing useful synthetic intermediates. To demonstrate the scope of the reaction, the methodology was successfully extended to TMS-protected ceramide.
Chemoselective per-O-trimethylsilylation and homogeneous N-functionalisation of amino sugars
作者:A. Abragam Joseph、Vijay M. Dhurandhare、Chun-Wei Chang、Ved Prakash Verma、Girija Prasad Mishra、Chiao-Chu Ku、Chun-Cheng Lin、Cheng-Chung Wang
DOI:10.1039/c4cc06645f
日期:——
HomogeneousN-functionalisation of amino sugars can be achievedviaefficient CH3CN-promoted hexamethyldisilazane per-O-trimethylsilylation.
氨基糖的均相N-官能化可以通过高效的CH3CN促进的六甲基二硅氮烷经过O-三甲基硅基化实现。
One-pot Dess-Martin periodinane-mediated oxidative deprotection and olefination of trimethylsilyl-protected pyranosides and pyranoses
作者:Rowan G. Glover、David P. Soulsby
DOI:10.1016/j.carres.2023.108904
日期:2023.10
periodinane-mediated oxidation deprotection. This is followed by addition of stabilized and non-stabilized ylides to generate alkenoate carbohydrates and related analogs in good to moderate yields. We also report on the rapid deprotection of the remaining trimethylsilyl ether groups in near quantitative yields using an acidic resin-mediated ethanolysis.