作者:Julio C. Castro-Palomino、Richard R. Schmidt
DOI:10.1055/s-1998-1689
日期:1998.5
Readily available O-(2-O-thiobenzoyl-mannopyranosyl)trichloroacetimidate 4a gave with glucosides 7 and 8 as glycosyl acceptors exclusively α-linked disaccharides 9 α and 10 α. Accordingly, from O-(2-O-thiobenzoyl-glucopyranosyl)trichloroacetimidate 4b exclusively β-linked disaccharides 9 β and 10 β were obtained. Radical initiated deoxygenation with Bu3SnH/AIBN directly furnished 2-deoxyglycosides 11 α,β and 12 α,β.
现成的 O-(2-O-硫代苯甲酰基-吡喃甘露糖基)三氯乙酰亚氨酸 4a 与葡萄糖苷 7 和 8 一起作为糖基接受体,只能得到δ-连接二糖 9 δ 和 10 δ。相应地,从 O-(2-O-硫代苯甲酰基-吡喃葡萄糖基)三氯乙酰亚氨酸 4b 中,只能得到δ-连接二糖 9 δ²和 10 δ²。用 Bu3SnH/AIBN 进行自由基引发的脱氧反应直接生成了 2-脱氧糖苷 11 δ,δ和 12 δ,δ。