Self-Sensitized Photooxygenation of 3,4-Dialkoxyfurans to Vitamin C or Its Derivatives
作者:Gholam H. Hakimelahi、Moti L. Jain、Tai Wei Ly、I-Chia Chen、Krishna S. Ethiraj、Jih Ru Hwu、Ali A. Moshfegh
DOI:10.1021/jo010531l
日期:2001.10.1
Self-sensitized photooxygenation of 3,4-dialkoxyfurans 3a-d with molecular oxygen and UV- or sunlight at room temperature gave vitamin C derivatives 2a-d in good to excellent yields. Furan 3c, having photodegradable protecting groups, was also photooxygenated to give L-ascorbic acid (1) in a "one-pot" reaction. Furthermore, a novel photolytic transformation was developed for deuteration of furan 3b
在室温下用分子氧和紫外线或日光对3,4-二烷氧基呋喃3a-d进行自增敏光氧合,可以很好地获得维生素C衍生物2a-d,且收率很高。具有光可降解保护基的呋喃3c也被光氧化以在“一锅法”反应中得到L-抗坏血酸(1)。此外,开发了一种新的光解转化技术,用于在D-2(2)O处的C-2位置处的呋喃3b氘化,以95%的收率得到呋喃3d。发现在氧气和间接太阳光下,呋喃3a-c和丁烯内酯2a-c对人类胚胎细胞,鼠胚胎成纤维细胞,正常成纤维细胞,HeLa和Vero细胞系的毒性远小于抗牛皮癣药物的毒性Anthralin和8-甲氧基补骨脂素。