title: Palladium-catalyzed double annulations to construct multisubstituted benzodifurans.
abstract: Efficient synthetic routes to construct multisubstituted benzo[1,2-b:5,4-b']difurans and benzo[1,2-b:4,5-b']difurans from bis(allyloxy)bis(alkynyl)benzenes or bis(alkynyl)dihydroxybenzenes and allylic halides utilizing palladium-catalyzed double annulations is reported. By further applying a double ring-closing metathesis reaction, pentacyclic compounds were also prepared.
authors.affiliation: State Key Laboratory of Organometallic Chemistry, Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences, Shanghai, PR China.
authors.forename: Zhiqiang
authors.initials: Z
authors.lastname: Liang
authors.forename: Shengming
authors.initials: S
authors.lastname: Ma
authors.forename: Jihong
authors.initials: J
authors.lastname: Yu
authors.forename: Ruren
authors.initials: R
authors.lastname: Xu