title: N-heterocyclic carbene catalyzed transformations of 3-halopropenals to the equivalents of beta-acylvinyl anions.
abstract: 3-Halopropenals 1 can behave as an alternative equivalent of beta-acylvinyl anions (I) in the presence of N-heterocyclic carbene precursor (IPr.HCl) and DBU to afford cyclic alpha,beta-unsaturated carbonyl derivatives, butenolides 4 and pyrazolone 6, after cyclization with 2 and 5, respectively.
authors.affiliation: Department of Chemistry, Zhejiang University, 20 Yugu Road, Hangzhou 310027, People's Republic of China.
authors.forename: Yihua
authors.initials: Y
authors.lastname: Wu
authors.forename: Weijun
authors.initials: W
authors.lastname: Yao
authors.forename: Lianjie
authors.initials: L
authors.lastname: Pan
authors.forename: Yiping
authors.initials: Y
authors.lastname: Zhang
authors.forename: Cheng
authors.initials: C
authors.lastname: Ma