Intramolecular Hetero Diels−Alder Reactions of α,α’-Dioxosulfines − A New Access to the [3.3.1]-Bicyclic Skeleton
作者:Giuseppe Capozzi、Stefano Menichetti、Cristina Nativi、Alessandro Provenzani
DOI:10.1002/1099-0690(200011)2000:22<3721::aid-ejoc3721>3.0.co;2-b
日期:2000.11
S-oxides. These in turn were suitable precursors of corresponding α,α′-dioxosulfine dienes with tethered internal electron-rich double bonds. Examining the synthetic utility of these sulfines, we observed either hydrolysis or intramolecular cycloaddition, depending on the distance between the reactive centres and the substitution on the double bond. Bicyclic derivatives with a [3.3.1] skeleton and an sp2
叔丁基硫基取代的1,4-氧杂草黄素的简单转化允许制备草硫黄素S-氧化物。这些反过来是相应的具有束缚的内部富电子双键的α,α′-二氧亚砜二烯的合适的前体。检查这些亚砜的合成效用,我们观察到水解或分子内环加成反应,取决于反应中心之间的距离和双键上的取代。从环加成物中获得具有[3.3.1]骨架和sp 2桥头碳的双环衍生物。