作者:Dominick Maes、Maria Eugenia Riveiro、Carina Shayo、Carlos Davio、Silvia Debenedetti、Norbert De Kimpe
DOI:10.1016/j.tet.2008.02.059
日期:2008.5
The synthesis of five naturally occurring polyoxygenated coumarins is described. It concerns two 5,6,7-trioxygenated coumarins, i.e., 6-hydroxy-5,7-dimethoxycoumarin (fraxinol) 1 and 5,6,7-trimethoxycoumarin 2, and three 5,7,8-trioxygenated coumarins, i.e., 8-hydroxy-5,7-dimethoxycoumarin (leptodactylone) 3, 5,7,8-trimethoxycoumarin 4 and 8-(3-methyl-2-butenyloxy)-5,7-dimethoxycoumarin (artanin) 5
描述了五种天然存在的多加氧香豆素的合成。它涉及两个5,6,7-三加氧香豆素,即6-羟基-5,7-二甲氧基香豆素(fraxinol)1和5,6,7-三甲氧基香豆素2,以及三个5,7,8-三加氧的香豆素,即8-羟基-5,7-二甲氧基(leptodactylone)3,5,7,8- trimethoxycoumarin 4和8-(3-甲基-2-丁烯氧基)-5,7-二甲氧基(artanin)5。合成途径的关键特征是合成合适的四氧化苯甲醛,然后通过维蒂希反应将其转化为相应的香豆素。