作者:Péter Molnár、József Deli、Ferenc Zsila、Andrea Steck、Hanspeter Pfander、Gyula Tóth
DOI:10.1002/hlca.200490001
日期:2004.1
6) were prepared by epoxidation of zeaxanthin diacetate (1) with monoperphthalic acid. Violaxanthins 5 and 6 were submitted to thermal isomerization and I2-catalyzed photoisomerization. The structure of the main products, i.e., (9Z)-5, (13Z)-5, (9Z)-6, (9′Z)-6, (13Z)-6, and (13′Z)-6, was determined by their UV/VIS, CD, 1H-NMR, 13C-NMR, and mass spectra.
紫黄质A(=(清一色ë,3小号,5小号,6 - [R,3'小号,5'小号,6' - [R)-5,6-:5',6'-二环氧5,6,5-', 6'-四氢-β,β-胡萝卜素-3,3'-二醇= syn,syn-紫黄质; 5)和紫黄质B(=(all- E,3 S,5 S,6 R,3 'S,5 '' R,6 'S)-5,6:5',6'-二环氧-5,6,5',6'-四氢-β,β-胡萝卜素-3,3'-二醇= syn,抗紫黄质;玉米黄质二乙酸玉米黄质(1)与单过苯二甲酸环氧化制备6)。将紫黄质5和6进行热异构化和I 2催化的光异构化。主要产品的结构,即,(9 Ž) - 5,(13 Ž) - 5,(9 Ž) - 6,(9' Ž) - 6,(13 Ž) - 6,和(13' ž)-6,由它们的UV / VIS,CD,1 H-NMR,13确定13 C-NMR和质谱。