描述了通过分子内2-羧基和2-甲酰基双(5-烷基呋喃-2-基)甲烷的分子环化反应合成许多在位置9处含有呋喃基取代基的萘并[2,3- b ]呋喃衍生物的方法。已经研究了标题化合物在甲酰化,乙酰化,硝化和氧化反应中的反应性。结果表明,硝化2-甲基-9-(5-甲基-2-呋喃基)萘并[2,3 - b ]呋喃-4-基乙酸盐会导致呋喃氧化开环而不是亲电取代。
As part of our ongoing interest in the synthesis of benz-annelated heterocycles from O-substituted benzylfurans, recyclization of [ O-(hydroxymethyl)aryl]difurylmethanes was studied. It was shown that, under acidic conditions, the O-hydroxymethyl group in these compounds acts as a nucleophile and tetracyclic isochromene derivatives are formed via a recyclization-cyclization tandem sequence. Alternatively