Chemoenzymatic Synthesis of n-Hexyl and O-.BETA.-D-Xylopyranosyl-(1.RAR.6)-.BETA.-D-glucopyranosides
作者:Masashi Kishida、Miho Nishiuchi、Keisuke Kato、Hiroyuki Akita
DOI:10.1248/cpb.52.1105
日期:——
Direct β-glucosidation between 1,6-octanediol (5) and D-glucose (3) using the immobilized β-glucosidase (EC 3.2.1.21) from almonds with the synthetic prepolymer ENTP-4000 gave a mono-β-glucoside (6) in 61.4% yield, which was converted into the n-hexyl β-D-glucopyranoside (1) by means of a chemoenzymatic method. The coupling of the n-hexyl β-D-glucopyranoside congener (13) and 2,3,4-tri-O-acetyl-β-D-xylosyl congener (14), followed by deprotection, afforded the synthetic n-hexyl O-β-D-xylopyranosyl-(1→6)-β-D-glucopyranoside (2), which was identical to the natural 2 with respect to the spectral data and specific rotation.
利用杏仁来源的固定化β-葡萄糖苷酶(EC 3.2.1.21)在合成预聚物ENTP-4000的辅助下,将1,6-辛二醇(5)与D-葡萄糖(3)直接进行β-葡萄糖苷化反应,以61.4%的产率得到了单-β-葡萄糖苷(6),再通过化学酶法将其转化为正己基β-D-吡喃葡萄糖苷(1)。接着,正己基β-D-吡喃葡萄糖苷类似物(13)与2,3,4-三-O-乙酰基-β-D-木糖苷类似物(14)进行偶联,随后去保护,合成了正己基O-β-D-木吡喃糖基-(1→6)-β-D-葡萄吡喃糖苷(2),该化合物在光谱数据和比旋光度上与天然产物2完全一致。