Reactivity of 4-Vinyl-2<i>H</i>-1-benzopyran-2-ones in Diels-Alder Cycloaddition Reactions: Access to Coumarin-Based Polycycles with Cdc25 Phosphatase-Inhibiting Activity
作者:Sergio Valente、Zhanjie Xu、Emilie Bana、Clemens Zwergel、Antonello Mai、Claus Jacob、Peter Meiser、Denyse Bagrel、Artur M. S. Silva、Gilbert Kirsch
DOI:10.1002/ejoc.201201736
日期:2013.5
The reactivity of 4-(1-butoxyvinyl)-2H-chromen-2-one (1) and (E)-4-(2-butoxyvinyl)-2H-chromen-2-one (2) as diene in thermal Diels–Aldercycloadditionreactions with several electron-poor dienophiles is reported. Among several dienophiles used in this study 1,4-benzoquinone afforded cycloadducts 11-butoxy-1H-naphtho[1,2-c]chromene-1,4,5-trione (3e) and 1H-naphtho[1,2-c]chromene-1,4,5-trione (4g) that