diastereoselective total syntheses of (±)‐caseabalansin A (1) and (±)‐18‐epicaseabalansin A (2) are described in this paper. We revealed that the intramolecular Robinson‐type annulation of an alkynone was effective in the stereocontrolled construction of the bicyclic skeleton of 1 and 2. Further transformation of the resulting enone, including diastereoselective reduction by LiAlH(OtBu)3, hydroxy‐group‐directed
本文描述了(±)–caseabalansin A(1)和(±)‐18-picaseaseabalansin A(2)的非对映选择性全合成。我们揭示了炔内酯的分子内罗宾逊型环法在双环骨架1和2的立体控制结构中是有效的。所得烯酮的进一步转化,包括通过LiAlH(O t Bu)3的非对映选择性还原,羟基定向的氢化作用,环化形成环状缩醛部分以及通过C(sp 3)-C()引入侧链sp 3)斯蒂勒偶联反应,合成了(±)-1和(±)-2。
Page, Philip C. Bulman; Jennens, David C., Journal of the Chemical Society. Perkin transactions I, 1992, # 20, p. 2587 - 2589