Studies on the stereoselective synthesis of a protected α-d-Gal-(1→2)-d-Glc fragment
作者:Langqiu Chen、Shen-De Shi、Yong-Qing Liu、Qing-Jiao Gao、Xing Yi、Kai-Ke Liu、Hao Liu
DOI:10.1016/j.carres.2011.03.012
日期:2011.7
A novel 1,2-cis stereoselective synthesis of protected α-D-Gal-(1→2)-D-Glc fragments was developed. Methyl 2-O-acetyl-3-O-allyl-4,6-O-benzylidene-α-D-galactopyranosyl-(1→2)-3-O-benzoyl-4,6-O-benzylidene-α-D-glucopyranoside (13), methyl 2-O-acetyl-3-O-allyl-4,6-O-benzylidene-α-D-galactopyranosyl-(1→2)-3,4,6-tri-O-benzoyl-α-D-glucopyranoside (15), methyl 2-O-acetyl-3-O-allyl-4,6-O-benzylidene-α-D-ga
开发了一种新型的1,2-顺式立体选择性合成保护的α-D-Gal-(1→2)-D-Glc片段。2-O-乙酰基-3-O-烯丙基-4,6-O-亚苄基-α-D-吡喃半乳糖基-(1→2)-3-O-苯甲酰基-4,6-O-亚苄基-α-D -吡喃葡萄糖苷(13),甲基2-O-乙酰基-3-O-烯丙基-4,6-O-亚苄基-α-D-吡喃半乳糖基-(1→2)-3,4,6-三-O-苯甲酰基-α-D-吡喃葡萄糖苷(15),甲基2-O-乙酰基-3-O-烯丙基-4,6-O-亚苄基-α-D-吡喃半乳糖基-(1→2)-3-O-苯甲酰基-4 ,6-O-亚苄基-β-D-吡喃葡萄糖苷(17)和甲基2-O-乙酰基-3-O-烯丙基-4,6-O-亚苄基-α-D-吡喃半乳糖基-(1→2)- 3,4,6-三-O-苯甲酰基-β-D-吡喃葡萄糖苷(19)可通过偶联新的供体异丙基2-O-乙酰基-3-O-烯丙基-4,6-O-亚苄基-获得1-硫代-β