作者:Jennifer M. Duker、Anthony S. Serianni
DOI:10.1016/0008-6215(93)84096-o
日期:1993.11
C-1, C-2, C-3, and C-6 of the fructofuranosyl ring. 1H (500 MHz) and 13C (75 and 125 MHz) NMR spectra of 1-3 have been obtained, yielding 1H-1H, 13C-1H, and 13C-13C spin coupling constants that were used to assess furanose ring and glycoside bond conformations in aqueous (2H2O) solution. Results show that the conformational mobility of the furanosyl ring in 3 is altered when incorporated into 1. Furthermore
蔗糖(β-D-果糖呋喃糖基α-D-吡喃葡糖苷,1),甲基α-D-果糖呋喃糖苷(2)和甲基β-D-果糖呋喃糖苷(3)已通过化学和/或酶法制备,具有单个位点果糖呋喃糖基环的C-1,C-2,C-3和C-6处的13C取代。已获得1-3的1H(500 MHz)和13C(75和125 MHz)NMR谱图,得到1H-1H,13C-1H和13C-13C自旋耦合常数,用于评估呋喃糖环和糖苷键的构象在(2H2O)水溶液中。结果表明,将呋喃糖基环3中的构象迁移率引入1时会改变。此外,糖苷键上的13C-13C和13C-1H自旋偶合表明psi扭转角不同于晶体中观察到的psi扭转角(phi看起来相似)。外消旋体效应的强度和溶液中氢键之间的相互作用可能部分归因于1的明显构象柔韧性。此外,已经将2和3中的自旋偶合与先前在α-D-苏式中测得的自旋偶合进行了比较。 -戊呋喃糖(4)和β-D-苏-戊呋喃糖(5)分别用作研究糖基