Use of Hydrazine Acetate as a Mild and Efficient Reagent for Anomeric Denitration of Carbohydrates
作者:Tatsushi Toyokuni、Shaopei Cai、Barbara Dean
DOI:10.1055/s-1992-26347
日期:——
Treatment of 3,4,6-tri-O-acetyl-2-azido-2-deoxy-α,β-D-galactopyranosyl nitrate (1), 3,6-di-O-acetyl-2-azido-2-deoxy-4-O-(2,3,4, 6-tetra-O-acetyl-β-D-galactopyranosyl)-α,β-D-glucopyranosyl nitrate (3), and 6-O-acetyl-2-azido-2-deoxy-3,4-O-isopropylidene-α,β-D-galactopyranosyl nitrate (5) with a slight excess of hydrazine acetate in anhydrous dimethylformamide at room temperature for 2 hours gave the corresponding hemiacetals, 2, 4, and 6 in the range of an 87-92 % yield.
将 3,4,6-三-O-乙酰基-2-叠氮-2-脱氧-δ±,δ-D-吡喃半乳糖硝酸酯 (1)、3,6-二-O-乙酰基-2-叠氮-2-脱氧-4-O-(2,3,4, 6-四-O-乙酰基-δ-D-吡喃半乳糖基)-δ±,δ-D-吡喃葡萄糖硝酸酯 (3) 和 6-O-乙酰基-2-叠氮-2-脱氧-3、在室温下,在无水二甲基甲酰胺中加入稍过量的乙酸肼 2 小时,再加入 4-O-异亚丙基-δ,δ-D-吡喃半乳糖基硝酸酯(5),得到相应的半乙酸酯 2、4 和 6,收率范围为 87-92%。