Total synthesis of globotriaosylceramide (Gb3) and lysoglobotriaosylceramide (lysoGb3)
作者:Kyriacos C. Nicolaou、Thomas J. Caulfield、Hideaki Katoaka
DOI:10.1016/0008-6215(90)84079-a
日期:1990.7
achieved by stereocontrolled coupling of 2,3,4,6-tetra-O-benzyl-alpha-D-galactosyl fluoride (15) with phenyl O-(6-O-benzoyl-2,3-di-O-pivaloyl-beta-D-galactopyranosyl)- (1----4)-2,3,6-tri-O-pivaloyl-1-thio-beta-D-glucopyranoside (14) to form the P kappa antigen trisaccharide masked as a phenyl 1-thioglycoside at the reducing end. Thioglycoside 16 was converted into glycosyl fluoride 19, which was coupled
我们最近报道了光学纯形式的球果糖神经酰胺(Gb3,1)的高效和立体控制合成。我们合成策略的关键是实现糖苷键形成的糖苷的两步活化以及(2S,3S,4E)-2-叠氮基-3-O-(叔丁基二甲基甲硅烷基)-4-的利用octadecen-1,3-di ol(9)作为鞘氨醇的当量。Gb3(1)和lysoGb3(2)的合成是通过将2,3,4,6-四-O-苄基-α-D-半乳糖基氟化物(15)与苯基O-(6-O-苯甲酰基-2,3-二-O-新戊酰基-β-D-吡喃半乳糖基)-(1 ---- 4)-2,3,6-三-O-新戊酰基-1-硫代-β-D-吡喃葡萄糖苷( 14)形成在还原端被掩蔽为苯基1-硫代糖苷的Pκ抗原三糖。硫代糖苷16转化为糖基氟化物19,与高产量的9配对。偶联产物20分别通过四步和三步转化为标题化合物1和2。本文以完整的实验详细介绍了1和2的总合成。