Synthesis and identification of 2,5-bis-(4-hydroxy-3-methoxyphenyl)-tetrahydrofuran-3,4-dicarboxylic acid, an unanticipated ferulate 8–8-coupling product acylating cereal plant cell walls
作者:Paul F. Schatz、John Ralph、Fachuang Lu、Ilia A. Guzei、Mirko Bunzel
DOI:10.1039/b605918j
日期:——
A new product implicated in cereal grain polysaccharide cross-linking has been authenticated by independent synthesis. Saponification of cereal grain fiber releases the RRRS/SSSR-isomer of 2,5-bis-(4-hydroxy-3-methoxyphenyl)-tetrahydrofuran-3,4-dicarboxylic acid. The parent ester logically derives from 8â8-coupling of ferulate followed by water addition to one of the incipient quinone methide moieties and internal trapping of the other. The finding adds complexity to the analysis of plant cell wall cross-linking, but provides clues to important polysaccharide cross-linking pathways occurring in planta.
一种与谷物多糖交联有关的新产物已通过独立合成得到验证。谷物纤维的皂化作用释放出 2,5-双-(4-羟基-3-甲氧基苯基)-四氢呋喃-3,4-二羧酸的 RRRS/SSSR 异构体。从逻辑上讲,母酯来源于阿魏酸酯的 8â8-偶联反应,然后在其中一个雏醌甲基上加水,并在另一个雏醌甲基上进行内部捕获。这一发现增加了植物细胞壁交联分析的复杂性,但为植物体内发生的重要多糖交联途径提供了线索。