Lignin–feruloyl ester cross-links in grasses. Part 2. Model compound syntheses
作者:John Ralph、Richard F. Helm、Stéphane Quideau
DOI:10.1039/p19920002971
日期:——
single geometrical isomer was produced. Synthesis of both isomers of derived compounds and detailed NMR analysis indicated that this was the expected Z-isomer. A model for β-5 coupled products, 3-[3-carboxy-2-(4-hydroxy-3-methoxyphenyl)-7-methoxy-2,3-dihydrobenzofuran-5-yl]acrylic acid bis(methyl 5-deoxy-α-L-arabinofuranosid-5-yl) ester, was obtained as a cis/trans mixture in 55% yield by radical coupling
已经合成了五种模拟当阿魏酸酯共聚成木质素时产生的各种结构的化合物。这些模型代表了被认为存在于禾本科中但尚未分离的木质素-阿魏酸酯-多糖结构。完整的光谱表征可提供重要的化学位移信息,以帮助鉴定天然木质素和合成DHP聚合物中的这些键。甲基5- O- 4 - O- [3-羟基-1-(4-羟基-3-甲氧基苯基)-2-(2-甲氧基苯氧基)丙基]阿魏酰} -α - L-阿拉伯呋喃糖苷,α模型阿魏酸酯与木质素的α-键连接,是苏式和赤式的混合物通过将甲基5- O-(E)-阿魏酰基-α- L-阿拉伯呋喃糖苷(FA-Ara)添加到衍生自1-(4-羟基-3-甲氧基苯基)-2-(2-甲氧基苯氧基)的醌甲基化物中的异构体丙烷-1,3-二醇(愈创木脂甘油-β-愈创木脂醚)。甲基5- O- 4 - O- [2-羟基-2-(4-羟基-3-甲氧基-苯基)-1-(羟甲基)乙基]阿魏酰基}-α- L-呋喃糖呋喃糖苷,一种β