中文摘要：

以间苯三酚和3，3-二甲基烯丙酸为起始原料，通过苄基保护、甲基化、脱保护基、Clemmenson还原、乙酰化、Fries重排、Baker．Venkataraman重排、环化等8步反应，合成了2个新型的A环并吡喃环黄酮化合物4’，

英文摘要：

Two novel 2＂, 2＂-dimethy-3＂, 4＂-2H dihydropyran-5＂, 6＂ ： 5,6-flavonoids, 4＇, 7-dimethoxy- 2＂, 2＂-dimethy-3 ＂, 4＂-2H dihydropyran- （ 5＂, 6＂ ： 5,6 ） -flavonoids and 2＇, 4＇ ,7-trimethoxy-2＂, 2＂-dime- thy-3＂,4＂-2H dihydropyran-（ 5＂,6＂ ： 5,6） -flavonoids, were synthesized from benzene-1,3,5-triol and 3-methylbut-2-enoic acid by a eight-step reaction of protection, methylation, deprotection, Clemmen- son reduction, Fries rearrangement, Baker-Venkataraman rearrangement, cyclization. The structures were characterized by I H NMR, 13C NMR and MS.