【摘要】 <正> 2 H-苯骈吡喃(2 H-1-benzopyranes,1)又称色烯(chrom-3-ene),是一类天然有机化合物的基本骨架。许多包烯类化合物具有生物活性和光致变色效应,因此它们的合成方法一直是合成化学家感兴趣的课题。本文报道一种简便合成2 H-苯骈吡喃基本骨架的新方法,并用此法合成了从 Ageratum 属植物中分离得到的2,2-二甲基-6,7-二甲氧基苯骈吡喃(2)。更多还原

【Abstract】 2H-1-Benzopyranes were synthesized by the reaction of 2-hydroxybenzaldehydesand allyl bromide in the presence of powdered tin.From the reaction of 2-hydroxy-4,5-di-methoxybenzaldehyde and 2-methyl-3-bromo-1-propene the natural product 2,2-dimethyl-6,7-dimethoxybenzopyrane(2),presented in Ageratum houstonianm,was synthesized(yield50%).The mechanism of reaction which leads to 2 H-benzopyranes was suggested.更多还原