Oxidation of 2,4-Alkadienoic Esters with Selenium Dioxide. A New Synthesis of Furans and Selenophenes
作者:Sadao Tsuboi、Shigetoshi Mimura、Shin-ichiro Ono、Kenji Watanabe、Akira Takeda
DOI:10.1246/bcsj.60.1807
日期:1987.5
Direct oxidation of 2,4-alkadienoic esters with selenium dioxide gave 5-alkyl-2-furancarboxylic esters along with 5-alkyl-2-selenophenecarboxylic esters. Ethyl 5-methylfurancarboxylate was converted to 5-hydroxymethyl-2-furancarbaldehyde, a component of honey, via ethyl 5-bromomethyl-2-furancarboxylate (5) in good yield. The compound 5 was converted to (5-ethoxycarbonyl-2-furyl)methyl dimethyldithiocarbamate
用二氧化硒直接氧化 2,4-链二烯酸酯得到 5-烷基-2-呋喃羧酸酯和 5-烷基-2-硒吩羧酸酯。5-甲基呋喃甲酸乙酯通过 5-溴甲基-2-呋喃甲酸乙酯 (5) 以良好的收率转化为蜂蜜的一种成分 5-羟甲基-2-呋喃甲醛。将化合物5转化为具有杀真菌活性的(5-乙氧基羰基-2-呋喃基)甲基二甲基二硫代氨基甲酸酯。5的三苯基鏻盐与壬醛反应得到5-(1-癸烯基)-2-呋喃羧酸乙酯(E/Z=88:12),产率为86%。5-甲基-2-硒吩羧酸乙酯也以30%的总产率转化为5-(1-癸烯基)-2-硒吩羧酸乙酯(E/Z=7:3)。