为了展示钯/降冰片烯 (Pd/NBE) 协同催化的合成效用,我们在此报道了基于茚酮的天然产物、少花酚 F 和 acredinone A 的简明合成,这些产物是通过芳基碘化物和不饱和羧酸酐之间的直接成环来实现的。与以前的茚酮制备方法相比,该方法允许使用简单的芳基碘化物作为底物,并完全控制区域选择性。acredinone A 的全合成以两种不同的 Pd/NBE 催化的邻位酰化反应为特征,用于构建五取代的芳烃核心,包括开发新的邻位酰化/原硼酸化。
Bicyclic phenols of type 1 with annelatedrings containing a N or an O heteroatom (X = N or O) as well as the ring opened analogs have been brominated and the product distribution determined. The results indicate that while most annelatedrings have a directingeffect to the ar-β position of the molecule, a 6-membered annelatedring is an exception and it facilitates substitution in the ar-α position
Synthesis of Aromatic Bisabolene Natural Products via Palladium-Catalyzed Cross-Couplings of Organozinc Reagents
作者:James R. Vyvyan、Celeste Loitz、Ryan E. Looper、Cheryl S. Mattingly、Emily A. Peterson、Steven T. Staben
DOI:10.1021/jo035778s
日期:2004.4.1
Aromatic bisabolene derivatives were prepared by two methods involving cross-coupling of organozinc reagents. The first synthesis of (±)-glandulone A (10), as well as syntheses of (±)-curcuhydroquinone (8) and (±)-curcuquinone (9), were accomplished via coupling of a secondary alkyl zinc reagent (1,5-dimethyl-4-hexenylzinc halide, 18) to protected bromohydroquinones using Pd(dppf)Cl2 as catalyst. Coupling