Benzoylated ethyl 1-thioglycosides: direct preparation from per-O-benzoylated sugars
作者:Deepak Sail、Pavol Kováč
DOI:10.1016/j.carres.2012.05.012
日期:2012.8
the beta-benzoate predominated. Treatment of the foregoing compounds with EtSH at slightly elevated temperature (50-60 degrees C) in the presence of BF(3).Et(2)O as a promoter gave the corresponding ethyl 1-thio glycosides in high yields. The alpha-products predominated in all cases in the anomeric mixtures formed. Individual products of all reactions were isolated by chromatography, they were obtained
D-葡萄糖、乳糖、麦芽糖和蜜二糖用 Bz(2)O-Et(3)N 试剂苯甲酰化,得到完全苯甲酰化的 β 产品。在相同条件下,D-甘露糖产生了以 β-苯甲酸酯为主的混合物。在BF(3).Et(2)O作为促进剂存在下,在稍微升高的温度(50-60℃)下用EtSH处理上述化合物,以高产率得到相应的乙基1-硫代糖苷。在所有情况下,在所形成的异头混合物中,α-产物占主导地位。所有反应的各个产物均通过色谱法分离,获得分析纯状态的产物,并通过 (1)H 和 (13)C NMR 数据和物理常数进行充分表征。