The 9-aryl-4-oxynaphthofuran-1(3H)-one system is
generally synthesized in two steps from α-aryl-o-toluic
acid derivatives. The method involves a tandem conjugate
addition–Dieckmann type condensation between α-lithiated
α-aryl-o-toluic acid derivatives and
2-furan-2(5H)-one as a key step followed by simple
dehydrogenation or dehydration, and can be applied to the synthesis of
two natural lignans (neojusticidin A and neojusticidin
B).
9-芳基-4-氧
萘呋喃-1(3H)-酮体系通常通过α-芳基-o-甲基
苯甲酸衍
生物进行两步合成。该方法涉及α-
锂化的α-芳基-o-甲基
苯甲酸衍
生物与2-
呋喃-2(5H)-酮之间的串联缩合反应(类达克曼缩合),这一关键步骤之后进行简单的脱氢或脱
水反应,并可应用于两种天然
木质素(新麦角素A和新麦角素B)的合成。