I2–PPh3 mediated spiroannulation of unsaturated β-dicarbonyl compounds. The first synthesis of (±)-negundoin A
作者:Rubén Tapia、Ma José Cano、Hanane Bouanou、Esteban Alvarez、Ramón Alvarez-Manzaneda、Rachid Chahboun、Enrique Alvarez-Manzaneda
DOI:10.1039/c3cc45921g
日期:——
An efficient and stereoselective spiroannulation of unsaturated enols is reported. Unsaturated beta-dicarbonyl compounds undergo cyclization by reaction with catalytic I2-PPh3, affording the corresponding spiro enol ether derivatives, with complete regio- and stereoselectivity, under mild conditions. Utilizing this new methodology, the first total synthesis of the anti-inflammatory diterpene negundoin
报道了不饱和烯醇的有效和立体选择性螺环化。不饱和β-二羰基化合物通过与催化I2-PPh3反应进行环化,在温和条件下提供相应的螺烯醇醚衍生物,具有完全的区域和立体选择性。据报道,利用这种新方法,首次合成了消炎性二萜Negundoin A和天然存在的锥虫醛。