One-Step Synthesis of Furan Rings from α-Isopropylidene Ketones Mediated by Iodine/DMSO: An Approach to Potent Bioactive Terpenes
作者:Jonida Salihila、Lúcia Silva、Helena Pérez del Pulgar、Ana Quílez Molina、Azucena González-Coloma、A. Sonia Olmeda、José F. Quílez del Moral、Alejandro F. Barrero
DOI:10.1021/acs.joc.9b00704
日期:2019.6.7
transformation of α-isopropylidene ketones into furan rings following a biomimetic approach. This methodology has been used for the synthesis of terpene furans such as mintfurane, curzerene, atractylon, and isoatractylon, all of them possessing interesting biological activities. The synthesis of linderazulene directly from 4,5-epoxygermacrone via a cascade reaction shows the potential of this protocol
TiCl4‐Et3N‐mediated condensation of ketones with methyl pyruvate afforded γ‐alkylidene butenolides via a tandem cross‐aldol addition/dehydroxylation/intramolecular lactonization process in one‐pot. The application of the methodology to the straightforward synthesis of elem‐1,3,7,8‐tetraen‐8,12‐olide, chloranthalactone A, and dehydromenthofurolactone, is demonstrated.
TiCl 4 - Et 3 N介导的酮与丙酮酸甲酯的缩合反应通过一个锅中的串联交叉羟醛加成/脱羟基/分子内内酯化过程提供了γ-亚烷基丁烯内酯。演示了该方法在直接合成elem-1,3,7,8-tetraen-8,12-内酯,氯半乳糖苷A和脱氢薄荷脑内酯中的应用。