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
作者:Page, Philip C. Bulman、Jennens, David C.
DOI:——
日期:——
Acylammonium Salts as Dienophiles in Diels–Alder/Lactonization Organocascades
作者:Mikail E. Abbasov、Brandi M. Hudson、Dean J. Tantillo、Daniel Romo
DOI:10.1021/ja501005g
日期:2014.3.26
α,β-Unsaturatedacylammoniumsalts, generated in situ fromcommodityacidchlorides and a chiral isothiourea organocatalyst, comprise a new and versatile family of chiral dienophiles for the venerable Diels–Alder (DA) cycloaddition. Their reactivity is unveiled through a highly diastereo- and enantioselective Diels–Alder/lactonization organocascade that generates cis- and trans-fused bicyclic γ- and
An IMDA Approach to Tigliane and Daphnane Diterpenoids: Generation of Rings A, B and C Incorporating C-18
作者:Philip C. Bulman Page、Colin M. Hayman、Heather L. McFarland、David J. Willock、Natasha M. Galea
DOI:10.1055/s-2002-22700
日期:——
A synthesis of the tricyclic ring system of the daphnane and tigliane diterpenes, incorporating C-18 and the C-13 oxygen functionality found in phorbol and related compounds is described. The convergent synthesis utilizes an intramolecular Diels-Alder reaction as the key stereocontrolling step.