Chemoenzymatic Synthesis of Naturally Occurring Benzyl 6-O-Glycosyl-.BETA.-D-glucopyranosides
作者:Eiji Kawahara、Mikio Fujii、Keisuke Kato、Yoshiteru Ida、Hiroyuki Akita
DOI:10.1248/cpb.53.1058
日期:——
Direct β-glucosidation between benzyl alcohol and D-glucose (5) using the immobilized β-glucosidase from almonds with the synthetic prepolymer ENTP-4000 gave a benzyl β-D-glucoside (1) in 53% yield. The coupling of the benzyl β-D-glucopyranoside congener (8) derived from 1 with phenyl 2,3,4-tri-O-acetyl-1-thio-β-D-xylopyranoside (9), ethyl 2,3,4-tri-O-acetyl-1-thio-α-L-rhamnopyranoside (13), and 2,3,4-tri-O-acetyl-α-L-arabinopyranosyl bromide (15) afforded 10, 14, and 16, respectively, as coupled products. Deprotection of 10, 14, and 16 provided the synthetic benzyl β-D-xylopyranosyl-(1→6)-β-D-glucopyranoside (2), benzyl α-L-rhamnopyranosyl-(1→6)-β-D-glucopyranoside (3), and benzyl α-L-arabinopyranosyl-(1→6)-β-D-glucopyranoside (4), respectively.
使用来自杏仁的固定化β-葡萄糖苷酶,直接将苄醇与D-葡萄糖(5)进行β-葡萄糖苷化反应,获得了苄基β-D-葡萄糖苷(1),产率为53%。将来自1的苄基β-D-葡萄糖吡喃苷同系物(8)与苯基2,3,4-三-O-乙酰-1-硫-β-D-木糖吡喃苷(9)、乙基2,3,4-三-O-乙酰-1-硫-α-L-鼠李吡喃苷(13)和2,3,4-三-O-乙酰-α-L-阿拉伯吡喃糖基溴化物(15)进行偶联,分别获得了10、14和16作为偶联产物。对10、14和16进行去保护后,分别得到了合成的苄基β-D-木糖吡喃糖-(1→6)-β-D-葡萄糖吡喃苷(2)、苄基α-L-鼠李吡喃糖-(1→6)-β-D-葡萄糖吡喃苷(3)和苄基α-L-阿拉伯吡喃糖-(1→6)-β-D-葡萄糖吡喃苷(4)。