A formal total synthesis of (.+-.)-quadrone.
作者:Chuzo Iwata、Masayuki Yamashita、Shohichi Aoki、Kenji Suzuki、Izumi Takahashi、Haruyuki Arakawa、Takeshi Imanishi、Tetsuaki Tanaka
DOI:10.1248/cpb.33.436
日期:——
This article deals with a formal total synthesis of (±)-quadrone (1), an antitumor sesquiterpene. The cyclopentenone (3) was trans-formed into cyclopropane derivative (2), a regioselective reductive ring opening of which and trapping of the enolate intermediate (16) by a C-1 unit afforded the diquinaneacetate (17). By a two-step sequence 17 was converted into methyl (1R*, 5R*, 6R*)-6-(2-hydroxyethyl)-7, 7-dimethyl-2-methylene-3-oxobicyclo [3. 3. 0] octane-1-acetate (19), which had already been proved to be an intermediate for (±)-1.
本文涉及一种抗肿瘤倍半萜类化合物(±)-四氢萘酮(1)的正式全合成。环戊烯酮(3)被转化为环丙烷衍生物(2),通过其位点选择性还原开环反应,以及通过C-1单元捕获烯醇中间体(16),得到二喹啉乙酸酯(17)。通过两步反应,17被转化为(1R*, 5R*, 6R*)-6-(2-羟基乙基)-7, 7-二甲基-2-亚甲基-3-氧代双环[3. 3. 0]辛烷-1-乙酸甲酯(19),该化合物已被证明是(±)-1的中间体。