Synthesis of l-(4-2H)erythrose, l-)1-13C, 5-2H)arabinose and l-(2-13C, 5-2H)arabinose and identification of the intermediates by 2H and 13C-N.M.R. spectroscopy
作者:Chung H. Han、Laurel O. Sillerud
DOI:10.1016/s0008-6215(00)90635-9
日期:1986.3
Abstract l -(1- 13 C, 5- 2 H)Arabinose ( 6 D) and l -(2- 13 C, 5- 2 H)arabinose ( 8 D) have been synthesized by degradation of 2,3- O -isopropylidene-α- l -rhamnofuranose ( 2 ) to l -(4- 2 H)erythrose ( 5β , 5α D), with subsequent chain elongation to 6 D plus l -(1- 13 C, 5- 2 H)ribose ( 7 D), the latter being converted into 8 D. Intermediates were identified by complete assignment of the 13 C chemical
摘要通过降解2,3-O-合成了1-(1- 13 C,5- 2 H)阿拉伯糖(6 D)和1-(2- 13 C,5- 2 H)阿拉伯糖(8 D)。异亚丙基-α-1-鼠李糖呋喃糖(2)生成1-(4- 2 H)赤藓糖(5β,5αD),随后链延长至6 D加1-(1-1 3 C,5- 2 H)核糖( 7 D),后者被转换为8D。通过使用碳-碳和碳-氘耦合常数,氘代位移,差分同位素位移和氘光谱通过13 C化学位移的完全分配来鉴定中间体。2和2,3-O-异亚丙基-1-(1-2 H)赤藓糖(4 D)的异头碳原子仅给出13 C共振,表明这两种化合物仅以一种主要的异头构型存在。报告的工作。2的合成 3-O-异亚丙基-1-(1-2 H)甘露糖醇(3 D)促进了非氘代类似物在13 C光谱中的信号分配。特定的氘富集和观察到的碳-氘偶合(1 JC,D〜22 Hz)不仅可以清楚地识别3中的氘代碳原子,而且还可以分配近距离共振。2