Alkoxycarbonyl groups can be readily installed on carbohydrates by reaction with the corresponding chloroformates in the presence of TMEDA at low temperature. The mild reaction conditions can be modulated to attain regioselective protections. (C) 2000 Elsevier Science Ltd. Ail rights reserved.
A facile preparation of uronates via selective oxidation with TEMPO/KBr/Ca(OCl)2 under aqueous conditions
作者:Feng Lin、Wenjie Peng、Wen Xu、Xiuwen Han、Biao Yu
DOI:10.1016/j.carres.2004.02.001
日期:2004.4
the TEMPO-mediated selective oxidation has the benefit of easier operation. A variety of partiallyprotected saccharide derivatives (1a-l) have been successfully converted into the corresponding uronate derivatives, including disaccharide building blocks for GAG fragments and precursors to saponins. The beneficial effect of Aliquat 336 was also disclosed in the oxidation of certain substrates.