Selective Acetylation of per-O-TMS-Protected Monosaccharides
摘要:
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.
Novel eco-friendly solution for the regioselective acetylation of per-O-TMS carbohydrates
作者:Lina Jin、Xianya Mao、Zhikun Wang、Yangyi Mao、Jianwei Mao、Yanli Cui
DOI:10.1016/j.carres.2020.108074
日期:2020.9
Regioselective acetylation of per-O-TMS carbohydrates was achieved preferentially at the 6 position or 1,6-position under mild conditions involving the eco-friendly solvent acetonitrile, at room temperature, in ambient atmosphere and in a shorter time. Good or moderate yields were obtained via 4-dimethylaminopyridine, without auxiliary equipment. A single α-O-Acetyl acetylation anomer was exclusively